diff options
-rw-r--r-- | arch/um/drivers/chan_kern.c | 77 | ||||
-rw-r--r-- | arch/um/drivers/line.c | 66 | ||||
-rw-r--r-- | arch/um/drivers/mconsole_kern.c | 40 | ||||
-rw-r--r-- | arch/um/drivers/net_kern.c | 97 | ||||
-rw-r--r-- | arch/um/drivers/ssl.c | 24 | ||||
-rw-r--r-- | arch/um/drivers/stdio_console.c | 22 | ||||
-rw-r--r-- | arch/um/drivers/ubd_kern.c | 132 | ||||
-rw-r--r-- | arch/um/include/chan_kern.h | 2 | ||||
-rw-r--r-- | arch/um/include/line.h | 8 | ||||
-rw-r--r-- | arch/um/include/mconsole_kern.h | 15 | ||||
-rw-r--r-- | arch/um/kernel/tt/gdb.c | 4 | ||||
-rw-r--r-- | arch/um/kernel/tt/gdb_kern.c | 4 |
12 files changed, 253 insertions, 238 deletions
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c index 7d4190e55654..4e7e3cfa21f9 100644 --- a/arch/um/drivers/chan_kern.c +++ b/arch/um/drivers/chan_kern.c @@ -19,44 +19,11 @@ #include "line.h" #include "os.h" -/* XXX: could well be moved to somewhere else, if needed. */ -static int my_printf(const char * fmt, ...) - __attribute__ ((format (printf, 1, 2))); - -static int my_printf(const char * fmt, ...) -{ - /* Yes, can be called on atomic context.*/ - char *buf = kmalloc(4096, GFP_ATOMIC); - va_list args; - int r; - - if (!buf) { - /* We print directly fmt. - * Yes, yes, yes, feel free to complain. */ - r = strlen(fmt); - } else { - va_start(args, fmt); - r = vsprintf(buf, fmt, args); - va_end(args); - fmt = buf; - } - - if (r) - r = os_write_file(1, fmt, r); - return r; - -} - #ifdef CONFIG_NOCONFIG_CHAN -/* Despite its name, there's no added trailing newline. */ -static int my_puts(const char * buf) +static void *not_configged_init(char *str, int device, + const struct chan_opts *opts) { - return os_write_file(1, buf, strlen(buf)); -} - -static void *not_configged_init(char *str, int device, struct chan_opts *opts) -{ - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); return NULL; } @@ -64,34 +31,34 @@ static void *not_configged_init(char *str, int device, struct chan_opts *opts) static int not_configged_open(int input, int output, int primary, void *data, char **dev_out) { - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); return -ENODEV; } static void not_configged_close(int fd, void *data) { - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); } static int not_configged_read(int fd, char *c_out, void *data) { - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); return -EIO; } static int not_configged_write(int fd, const char *buf, int len, void *data) { - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); return -EIO; } static int not_configged_console_write(int fd, const char *buf, int len) { - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); return -EIO; } @@ -99,14 +66,14 @@ static int not_configged_console_write(int fd, const char *buf, int len) static int not_configged_window_size(int fd, void *data, unsigned short *rows, unsigned short *cols) { - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); return -ENODEV; } static void not_configged_free(void *data) { - my_puts("Using a channel type which is configured out of " + printk("Using a channel type which is configured out of " "UML\n"); } @@ -534,7 +501,7 @@ static const struct chan_type chan_table[] = { }; static struct chan *parse_chan(struct line *line, char *str, int device, - const struct chan_opts *opts) + const struct chan_opts *opts, char **error_out) { const struct chan_type *entry; const struct chan_ops *ops; @@ -553,19 +520,21 @@ static struct chan *parse_chan(struct line *line, char *str, int device, } } if(ops == NULL){ - my_printf("parse_chan couldn't parse \"%s\"\n", - str); + *error_out = "No match for configured backends"; return NULL; } - if(ops->init == NULL) - return NULL; + data = (*ops->init)(str, device, opts); - if(data == NULL) + if(data == NULL){ + *error_out = "Configuration failed"; return NULL; + } chan = kmalloc(sizeof(*chan), GFP_ATOMIC); - if(chan == NULL) + if(chan == NULL){ + *error_out = "Memory allocation failed"; return NULL; + } *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list), .free_list = LIST_HEAD_INIT(chan->free_list), @@ -582,7 +551,7 @@ static struct chan *parse_chan(struct line *line, char *str, int device, } int parse_chan_pair(char *str, struct line *line, int device, - const struct chan_opts *opts) + const struct chan_opts *opts, char **error_out) { struct list_head *chans = &line->chan_list; struct chan *new, *chan; @@ -599,14 +568,14 @@ int parse_chan_pair(char *str, struct line *line, int device, in = str; *out = '\0'; out++; - new = parse_chan(line, in, device, opts); + new = parse_chan(line, in, device, opts, error_out); if(new == NULL) return -1; new->input = 1; list_add(&new->list, chans); - new = parse_chan(line, out, device, opts); + new = parse_chan(line, out, device, opts, error_out); if(new == NULL) return -1; @@ -614,7 +583,7 @@ int parse_chan_pair(char *str, struct line *line, int device, new->output = 1; } else { - new = parse_chan(line, str, device, opts); + new = parse_chan(line, str, device, opts, error_out); if(new == NULL) return -1; diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c index 799fca3644e9..e620ed46ed3f 100644 --- a/arch/um/drivers/line.c +++ b/arch/um/drivers/line.c @@ -549,14 +549,16 @@ void close_lines(struct line *lines, int nlines) close_chan(&lines[i].chan_list, 0); } -static void setup_one_line(struct line *lines, int n, char *init, int init_prio) +static int setup_one_line(struct line *lines, int n, char *init, int init_prio, + char **error_out) { struct line *line = &lines[n]; + int err = -EINVAL; spin_lock(&line->count_lock); if(line->tty != NULL){ - printk("line_setup - device %d is open\n", n); + *error_out = "Device is already open"; goto out; } @@ -569,18 +571,22 @@ static void setup_one_line(struct line *lines, int n, char *init, int init_prio) line->valid = 1; } } + err = 0; out: spin_unlock(&line->count_lock); + return err; } /* Common setup code for both startup command line and mconsole initialization. * @lines contains the array (of size @num) to modify; * @init is the setup string; + * @error_out is an error string in the case of failure; */ -int line_setup(struct line *lines, unsigned int num, char *init) +int line_setup(struct line *lines, unsigned int num, char *init, + char **error_out) { - int i, n; + int i, n, err; char *end; if(*init == '=') { @@ -591,52 +597,56 @@ int line_setup(struct line *lines, unsigned int num, char *init) else { n = simple_strtoul(init, &end, 0); if(*end != '='){ - printk(KERN_ERR "line_setup failed to parse \"%s\"\n", - init); - return 0; + *error_out = "Couldn't parse device number"; + return -EINVAL; } init = end; } init++; if (n >= (signed int) num) { - printk("line_setup - %d out of range ((0 ... %d) allowed)\n", - n, num - 1); - return 0; + *error_out = "Device number out of range"; + return -EINVAL; + } + else if (n >= 0){ + err = setup_one_line(lines, n, init, INIT_ONE, error_out); + if(err) + return err; } - else if (n >= 0) - setup_one_line(lines, n, init, INIT_ONE); else { - for(i = 0; i < num; i++) - setup_one_line(lines, i, init, INIT_ALL); + for(i = 0; i < num; i++){ + err = setup_one_line(lines, i, init, INIT_ALL, + error_out); + if(err) + return err; + } } return n == -1 ? num : n; } int line_config(struct line *lines, unsigned int num, char *str, - const struct chan_opts *opts) + const struct chan_opts *opts, char **error_out) { struct line *line; char *new; int n; if(*str == '='){ - printk("line_config - can't configure all devices from " - "mconsole\n"); - return 1; + *error_out = "Can't configure all devices from mconsole"; + return -EINVAL; } new = kstrdup(str, GFP_KERNEL); if(new == NULL){ - printk("line_config - kstrdup failed\n"); - return 1; + *error_out = "Failed to allocate memory"; + return -ENOMEM; } - n = line_setup(lines, num, new); + n = line_setup(lines, num, new, error_out); if(n < 0) - return 1; + return n; line = &lines[n]; - return parse_chan_pair(line->init_str, line, n, opts); + return parse_chan_pair(line->init_str, line, n, opts, error_out); } int line_get_config(char *name, struct line *lines, unsigned int num, char *str, @@ -685,13 +695,13 @@ int line_id(char **str, int *start_out, int *end_out) return n; } -int line_remove(struct line *lines, unsigned int num, int n) +int line_remove(struct line *lines, unsigned int num, int n, char **error_out) { int err; char config[sizeof("conxxxx=none\0")]; sprintf(config, "%d=none", n); - err = line_setup(lines, num, config); + err = line_setup(lines, num, config, error_out); if(err >= 0) err = 0; return err; @@ -740,6 +750,7 @@ static LIST_HEAD(winch_handlers); void lines_init(struct line *lines, int nlines, struct chan_opts *opts) { struct line *line; + char *error; int i; for(i = 0; i < nlines; i++){ @@ -754,8 +765,9 @@ void lines_init(struct line *lines, int nlines, struct chan_opts *opts) if(line->init_str == NULL) printk("lines_init - kstrdup returned NULL\n"); - if(parse_chan_pair(line->init_str, line, i, opts)){ - printk("parse_chan_pair failed for device %d\n", i); + if(parse_chan_pair(line->init_str, line, i, opts, &error)){ + printk("parse_chan_pair failed for device %d : %s\n", + i, error); line->valid = 0; } } diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c index 96f0189327af..832d5c766ca8 100644 --- a/arch/um/drivers/mconsole_kern.c +++ b/arch/um/drivers/mconsole_kern.c @@ -371,14 +371,16 @@ static unsigned long long unplugged_pages_count = 0; static struct list_head unplugged_pages = LIST_HEAD_INIT(unplugged_pages); static int unplug_index = UNPLUGGED_PER_PAGE; -static int mem_config(char *str) +static int mem_config(char *str, char **error_out) { unsigned long long diff; int err = -EINVAL, i, add; char *ret; - if(str[0] != '=') + if(str[0] != '='){ + *error_out = "Expected '=' after 'mem'"; goto out; + } str++; if(str[0] == '-') @@ -386,12 +388,17 @@ static int mem_config(char *str) else if(str[0] == '+'){ add = 1; } - else goto out; + else { + *error_out = "Expected increment to start with '-' or '+'"; + goto out; + } str++; diff = memparse(str, &ret); - if(*ret != '\0') + if(*ret != '\0'){ + *error_out = "Failed to parse memory increment"; goto out; + } diff /= PAGE_SIZE; @@ -435,11 +442,14 @@ static int mem_config(char *str) unplugged = list_entry(entry, struct unplugged_pages, list); - unplugged->pages[unplug_index++] = addr; err = os_drop_memory(addr, PAGE_SIZE); - if(err) + if(err){ printk("Failed to release memory - " "errno = %d\n", err); + *error_out = "Failed to release memory"; + goto out; + } + unplugged->pages[unplug_index++] = addr; } unplugged_pages_count++; @@ -470,8 +480,9 @@ static int mem_id(char **str, int *start_out, int *end_out) return 0; } -static int mem_remove(int n) +static int mem_remove(int n, char **error_out) { + *error_out = "Memory doesn't support the remove operation"; return -EBUSY; } @@ -542,7 +553,7 @@ static void mconsole_get_config(int (*get_config)(char *, char *, int, void mconsole_config(struct mc_request *req) { struct mc_device *dev; - char *ptr = req->request.data, *name; + char *ptr = req->request.data, *name, *error_string = ""; int err; ptr += strlen("config"); @@ -559,8 +570,8 @@ void mconsole_config(struct mc_request *req) ptr++; if(*ptr == '='){ - err = (*dev->config)(name); - mconsole_reply(req, "", err, 0); + err = (*dev->config)(name, &error_string); + mconsole_reply(req, error_string, err, 0); } else mconsole_get_config(dev->get_config, req, name); } @@ -595,13 +606,16 @@ void mconsole_remove(struct mc_request *req) goto out; } - err = (*dev->remove)(n); + err_msg = NULL; + err = (*dev->remove)(n, &err_msg); switch(err){ case -ENODEV: - err_msg = "Device doesn't exist"; + if(err_msg == NULL) + err_msg = "Device doesn't exist"; break; case -EBUSY: - err_msg = "Device is currently open"; + if(err_msg == NULL) + err_msg = "Device is currently open"; break; default: break; diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c index afe3d427ddfa..07e839e387db 100644 --- a/arch/um/drivers/net_kern.c +++ b/arch/um/drivers/net_kern.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and + * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and * James Leu (jleu@mindspring.net). * Copyright (C) 2001 by various other people who didn't put their name here. * Licensed under the GPL. @@ -91,8 +91,8 @@ irqreturn_t uml_net_interrupt(int irq, void *dev_id) spin_lock(&lp->lock); while((err = uml_net_rx(dev)) > 0) ; if(err < 0) { - printk(KERN_ERR - "Device '%s' read returned %d, shutting it down\n", + printk(KERN_ERR + "Device '%s' read returned %d, shutting it down\n", dev->name, err); /* dev_close can't be called in interrupt context, and takes * again lp->lock. @@ -159,7 +159,7 @@ out: static int uml_net_close(struct net_device *dev) { struct uml_net_private *lp = dev->priv; - + netif_stop_queue(dev); free_irq(dev->irq, dev); @@ -194,7 +194,7 @@ static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) /* this is normally done in the interrupt when tx finishes */ netif_wake_queue(dev); - } + } else if(len == 0){ netif_start_queue(dev); lp->stats.tx_dropped++; @@ -333,7 +333,7 @@ static int eth_configure(int n, void *init, char *mac, struct uml_net_private *lp; int save, err, size; - size = transport->private_size + sizeof(struct uml_net_private) + + size = transport->private_size + sizeof(struct uml_net_private) + sizeof(((struct uml_net_private *) 0)->user); device = kzalloc(sizeof(*device), GFP_KERNEL); @@ -438,7 +438,7 @@ static int eth_configure(int n, void *init, char *mac, lp->tl.function = uml_net_user_timer_expire; memcpy(lp->mac, device->mac, sizeof(lp->mac)); - if (transport->user->init) + if (transport->user->init) (*transport->user->init)(&lp->user, dev); set_ether_mac(dev, device->mac); @@ -463,35 +463,33 @@ static struct uml_net *find_device(int n) return(device); } -static int eth_parse(char *str, int *index_out, char **str_out) +static int eth_parse(char *str, int *index_out, char **str_out, + char **error_out) { char *end; - int n; + int n, err = -EINVAL;; n = simple_strtoul(str, &end, 0); if(end == str){ - printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str); - return(1); - } - if(n < 0){ - printk(KERN_ERR "eth_setup: device %d is negative\n", n); - return(1); + *error_out = "Bad device number"; + return err; } + str = end; if(*str != '='){ - printk(KERN_ERR - "eth_setup: expected '=' after device number\n"); - return(1); + *error_out = "Expected '=' after device number"; + return err; } + str++; if(find_device(n)){ - printk(KERN_ERR "eth_setup: Device %d already configured\n", - n); - return(1); + *error_out = "Device already configured"; + return err; } - if(index_out) *index_out = n; + + *index_out = n; *str_out = str; - return(0); + return 0; } struct eth_init { @@ -581,11 +579,15 @@ static int eth_setup_common(char *str, int index) static int eth_setup(char *str) { struct eth_init *new; + char *error; int n, err; - err = eth_parse(str, &n, &str); - if(err) + err = eth_parse(str, &n, &str, &error); + if(err){ + printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", + str, error); return 1; + } new = alloc_bootmem(sizeof(*new)); if (new == NULL){ @@ -619,26 +621,30 @@ static int eth_init(void) if(eth_setup_common(eth->init, eth->index)) list_del(ð->list); } - + return(1); } __initcall(eth_init); #endif -static int net_config(char *str) +static int net_config(char *str, char **error_out) { int n, err; - err = eth_parse(str, &n, &str); - if(err) return(err); + err = eth_parse(str, &n, &str, error_out); + if(err) + return err; + /* This string is broken up and the pieces used by the underlying + * driver. So, it is freed only if eth_setup_common fails. + */ str = kstrdup(str, GFP_KERNEL); if(str == NULL){ - printk(KERN_ERR "net_config failed to strdup string\n"); - return(-1); + *error_out = "net_config failed to strdup string"; + return -ENOMEM; } err = !eth_setup_common(str, n); - if(err) + if(err) kfree(str); return(err); } @@ -658,7 +664,7 @@ static int net_id(char **str, int *start_out, int *end_out) return n; } -static int net_remove(int n) +static int net_remove(int n, char **error_out) { struct uml_net *device; struct net_device *dev; @@ -727,7 +733,7 @@ struct notifier_block uml_inetaddr_notifier = { static int uml_net_init(void) { struct list_head *ele; - struct uml_net_private *lp; + struct uml_net_private *lp; struct in_device *ip; struct in_ifaddr *in; @@ -747,7 +753,7 @@ static int uml_net_init(void) uml_inetaddr_event(NULL, NETDEV_UP, in); in = in->ifa_next; } - } + } return(0); } @@ -783,8 +789,8 @@ struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra) return(skb); } -void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, - void *), +void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, + void *), void *arg) { struct net_device *dev = d; @@ -809,11 +815,11 @@ int dev_netmask(void *d, void *m) struct in_ifaddr *in; __be32 *mask_out = m; - if(ip == NULL) + if(ip == NULL) return(1); in = ip->ifa_list; - if(in == NULL) + if(in == NULL) return(1); *mask_out = in->ifa_mask; @@ -835,7 +841,7 @@ void free_output_buffer(void *buffer) free_pages((unsigned long) buffer, 0); } -int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, +int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, char **gate_addr) { char *remain; @@ -854,14 +860,3 @@ unsigned short eth_protocol(struct sk_buff *skb) { return(eth_type_trans(skb, skb->dev)); } - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c index ed9c59082d0d..1e82430b8444 100644 --- a/arch/um/drivers/ssl.c +++ b/arch/um/drivers/ssl.c @@ -46,9 +46,9 @@ static struct chan_opts opts = { .in_kernel = 1, }; -static int ssl_config(char *str); +static int ssl_config(char *str, char **error_out); static int ssl_get_config(char *dev, char *str, int size, char **error_out); -static int ssl_remove(int n); +static int ssl_remove(int n, char **error_out); static struct line_driver driver = { .name = "UML serial line", @@ -80,9 +80,10 @@ static struct line serial_lines[NR_PORTS] = static struct lines lines = LINES_INIT(NR_PORTS); -static int ssl_config(char *str) +static int ssl_config(char *str, char **error_out) { - return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts); + return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, + error_out); } static int ssl_get_config(char *dev, char *str, int size, char **error_out) @@ -91,9 +92,10 @@ static int ssl_get_config(char *dev, char *str, int size, char **error_out) size, error_out); } -static int ssl_remove(int n) +static int ssl_remove(int n, char **error_out) { - return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n); + return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, + error_out); } static int ssl_open(struct tty_struct *tty, struct file *filp) @@ -212,7 +214,15 @@ __uml_exitcall(ssl_exit); static int ssl_chan_setup(char *str) { - return line_setup(serial_lines, ARRAY_SIZE(serial_lines), str); + char *error; + int ret; + + ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error); + if(ret < 0) + printk(KERN_ERR "Failed to set up serial line with " + "configuration string \"%s\" : %s\n", str, error); + + return 1; } __setup("ssl", ssl_chan_setup); diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c index 9b2dd0b8a43b..3cbfe3a88607 100644 --- a/arch/um/drivers/stdio_console.c +++ b/arch/um/drivers/stdio_console.c @@ -52,9 +52,9 @@ static struct chan_opts opts = { .in_kernel = 1, }; -static int con_config(char *str); +static int con_config(char *str, char **error_out); static int con_get_config(char *dev, char *str, int size, char **error_out); -static int con_remove(int n); +static int con_remove(int n, char **con_remove); static struct line_driver driver = { .name = "UML console", @@ -87,9 +87,9 @@ static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), [ 1 ... MAX_TTYS - 1 ] = LINE_INIT(CONFIG_CON_CHAN, &driver) }; -static int con_config(char *str) +static int con_config(char *str, char **error_out) { - return line_config(vts, ARRAY_SIZE(vts), str, &opts); + return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out); } static int con_get_config(char *dev, char *str, int size, char **error_out) @@ -97,9 +97,9 @@ static int con_get_config(char *dev, char *str, int size, char **error_out) return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); } -static int con_remove(int n) +static int con_remove(int n, char **error_out) { - return line_remove(vts, ARRAY_SIZE(vts), n); + return line_remove(vts, ARRAY_SIZE(vts), n, error_out); } static int con_open(struct tty_struct *tty, struct file *filp) @@ -192,7 +192,15 @@ __uml_exitcall(console_exit); static int console_chan_setup(char *str) { - return line_setup(vts, ARRAY_SIZE(vts), str); + char *error; + int ret; + + ret = line_setup(vts, ARRAY_SIZE(vts), str, &error); + if(ret < 0) + printk(KERN_ERR "Failed to set up console with " + "configuration string \"%s\" : %s\n", str, error); + + return 1; } __setup("con", console_chan_setup); __channel_help(console_chan_setup, "con"); diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 49c047b75cc5..f4db97efc014 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -286,7 +286,7 @@ static int parse_unit(char **ptr) * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it * should not be freed on exit. */ -static int ubd_setup_common(char *str, int *index_out) +static int ubd_setup_common(char *str, int *index_out, char **error_out) { struct ubd *ubd_dev; struct openflags flags = global_openflags; @@ -302,56 +302,54 @@ static int ubd_setup_common(char *str, int *index_out) str++; if(!strcmp(str, "sync")){ global_openflags = of_sync(global_openflags); - return(0); + return 0; } major = simple_strtoul(str, &end, 0); if((*end != '\0') || (end == str)){ - printk(KERN_ERR - "ubd_setup : didn't parse major number\n"); - return(1); + *error_out = "Didn't parse major number"; + return -EINVAL; } - err = 1; - mutex_lock(&ubd_lock); - if(fake_major != MAJOR_NR){ - printk(KERN_ERR "Can't assign a fake major twice\n"); - goto out1; - } + err = -EINVAL; + mutex_lock(&ubd_lock); + if(fake_major != MAJOR_NR){ + *error_out = "Can't assign a fake major twice"; + goto out1; + } - fake_major = major; + fake_major = major; printk(KERN_INFO "Setting extra ubd major number to %d\n", major); - err = 0; - out1: - mutex_unlock(&ubd_lock); - return(err); + err = 0; + out1: + mutex_unlock(&ubd_lock); + return err; } n = parse_unit(&str); if(n < 0){ - printk(KERN_ERR "ubd_setup : couldn't parse unit number " - "'%s'\n", str); - return(1); + *error_out = "Couldn't parse device number"; + return -EINVAL; } if(n >= MAX_DEV){ - printk(KERN_ERR "ubd_setup : index %d out of range " - "(%d devices, from 0 to %d)\n", n, MAX_DEV, MAX_DEV - 1); - return(1); + *error_out = "Device number out of range"; + return 1; } - err = 1; + err = -EBUSY; mutex_lock(&ubd_lock); ubd_dev = &ubd_devs[n]; if(ubd_dev->file != NULL){ - printk(KERN_ERR "ubd_setup : device already configured\n"); + *error_out = "Device is already configured"; goto out; } if (index_out) *index_out = n; + err = -EINVAL; for (i = 0; i < sizeof("rscd="); i++) { switch (*str) { case 'r': @@ -370,47 +368,54 @@ static int ubd_setup_common(char *str, int *index_out) str++; goto break_loop; default: - printk(KERN_ERR "ubd_setup : Expected '=' or flag letter (r, s, c, or d)\n"); + *error_out = "Expected '=' or flag letter " + "(r, s, c, or d)"; goto out; } str++; } - if (*str == '=') - printk(KERN_ERR "ubd_setup : Too many flags specified\n"); - else - printk(KERN_ERR "ubd_setup : Expected '='\n"); + if (*str == '=') + *error_out = "Too many flags specified"; + else + *error_out = "Missing '='"; goto out; break_loop: - err = 0; backing_file = strchr(str, ','); - if (!backing_file) { + if (backing_file == NULL) backing_file = strchr(str, ':'); - } - if(backing_file){ - if(ubd_dev->no_cow) - printk(KERN_ERR "Can't specify both 'd' and a " - "cow file\n"); + if(backing_file != NULL){ + if(ubd_dev->no_cow){ + *error_out = "Can't specify both 'd' and a cow file"; + goto out; + } else { *backing_file = '\0'; backing_file++; } } + err = 0; ubd_dev->file = str; ubd_dev->cow.file = backing_file; ubd_dev->boot_openflags = flags; out: mutex_unlock(&ubd_lock); - return(err); + return err; } static int ubd_setup(char *str) { - ubd_setup_common(str, NULL); - return(1); + char *error; + int err; + + err = ubd_setup_common(str, NULL, &error); + if(err) + printk(KERN_ERR "Failed to initialize device with \"%s\" : " + "%s\n", str, error); + return 1; } __setup("ubd", ubd_setup); @@ -422,7 +427,7 @@ __uml_help(ubd_setup, " use either a ':' or a ',': the first one allows writing things like;\n" " ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n" " while with a ',' the shell would not expand the 2nd '~'.\n" -" When using only one filename, UML will detect whether to thread it like\n" +" When using only one filename, UML will detect whether to treat it like\n" " a COW file or a backing file. To override this detection, add the 'd'\n" " flag:\n" " ubd0d=BackingFile\n" @@ -668,18 +673,19 @@ static int ubd_disk_register(int major, u64 size, int unit, #define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9)) -static int ubd_add(int n) +static int ubd_add(int n, char **error_out) { struct ubd *ubd_dev = &ubd_devs[n]; - int err; + int err = 0; - err = -ENODEV; if(ubd_dev->file == NULL) goto out; err = ubd_file_size(ubd_dev, &ubd_dev->size); - if(err < 0) + if(err < 0){ + *error_out = "Couldn't determine size of device's file"; goto out; + } ubd_dev->size = ROUND_BLOCK(ubd_dev->size); @@ -701,28 +707,31 @@ out: return err; } -static int ubd_config(char *str) +static int ubd_config(char *str, char **error_out) { int n, ret; + /* This string is possibly broken up and stored, so it's only + * freed if ubd_setup_common fails, or if only general options + * were set. + */ str = kstrdup(str, GFP_KERNEL); if (str == NULL) { - printk(KERN_ERR "ubd_config failed to strdup string\n"); - ret = 1; - goto out; + *error_out = "Failed to allocate memory"; + return -ENOMEM; } - ret = ubd_setup_common(str, &n); - if (ret) { - ret = -1; + + ret = ubd_setup_common(str, &n, error_out); + if (ret) goto err_free; - } + if (n == -1) { ret = 0; goto err_free; } mutex_lock(&ubd_lock); - ret = ubd_add(n); + ret = ubd_add(n, error_out); if (ret) ubd_devs[n].file = NULL; mutex_unlock(&ubd_lock); @@ -777,7 +786,7 @@ static int ubd_id(char **str, int *start_out, int *end_out) return n; } -static int ubd_remove(int n) +static int ubd_remove(int n, char **error_out) { struct ubd *ubd_dev; int err = -ENODEV; @@ -815,7 +824,9 @@ out: return err; } -/* All these are called by mconsole in process context and without ubd-specific locks. */ +/* All these are called by mconsole in process context and without + * ubd-specific locks. + */ static struct mc_device ubd_mc = { .name = "ubd", .config = ubd_config, @@ -851,7 +862,8 @@ static struct platform_driver ubd_driver = { static int __init ubd_init(void) { - int i; + char *error; + int i, err; if (register_blkdev(MAJOR_NR, "ubd")) return -1; @@ -870,8 +882,12 @@ static int __init ubd_init(void) return -1; } platform_driver_register(&ubd_driver); - for (i = 0; i < MAX_DEV; i++) - ubd_add(i); + for (i = 0; i < MAX_DEV; i++){ + err = ubd_add(i, &error); + if(err) + printk(KERN_ERR "Failed to initialize ubd device %d :" + "%s\n", i, error); + } return 0; } diff --git a/arch/um/include/chan_kern.h b/arch/um/include/chan_kern.h index 9003a343e148..2d9aa7ef4c27 100644 --- a/arch/um/include/chan_kern.h +++ b/arch/um/include/chan_kern.h @@ -30,7 +30,7 @@ struct chan { extern void chan_interrupt(struct list_head *chans, struct delayed_work *task, struct tty_struct *tty, int irq); extern int parse_chan_pair(char *str, struct line *line, int device, - const struct chan_opts *opts); + const struct chan_opts *opts, char **error_out); extern int open_chan(struct list_head *chans); extern int write_chan(struct list_head *chans, const char *buf, int len, int write_irq); diff --git a/arch/um/include/line.h b/arch/um/include/line.h index b79643eeee08..a2486b4cc9fe 100644 --- a/arch/um/include/line.h +++ b/arch/um/include/line.h @@ -76,7 +76,7 @@ struct lines { extern void line_close(struct tty_struct *tty, struct file * filp); extern int line_open(struct line *lines, struct tty_struct *tty); extern int line_setup(struct line *lines, unsigned int sizeof_lines, - char *init); + char *init, char **error_out); extern int line_write(struct tty_struct *tty, const unsigned char *buf, int len); extern void line_put_char(struct tty_struct *tty, unsigned char ch); @@ -102,9 +102,11 @@ extern void lines_init(struct line *lines, int nlines, struct chan_opts *opts); extern void close_lines(struct line *lines, int nlines); extern int line_config(struct line *lines, unsigned int sizeof_lines, - char *str, const struct chan_opts *opts); + char *str, const struct chan_opts *opts, + char **error_out); extern int line_id(char **str, int *start_out, int *end_out); -extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n); +extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n, + char **error_out); extern int line_get_config(char *dev, struct line *lines, unsigned int sizeof_lines, char *str, int size, char **error_out); diff --git a/arch/um/include/mconsole_kern.h b/arch/um/include/mconsole_kern.h index 1ea6d928e1cd..73030e52b2ce 100644 --- a/arch/um/include/mconsole_kern.h +++ b/arch/um/include/mconsole_kern.h @@ -18,10 +18,10 @@ struct mconsole_entry { struct mc_device { struct list_head list; char *name; - int (*config)(char *); + int (*config)(char *, char **); int (*get_config)(char *, char *, int, char **); int (*id)(char **, int *, int *); - int (*remove)(int); + int (*remove)(int, char **); }; #define CONFIG_CHUNK(str, size, current, chunk, end) \ @@ -50,14 +50,3 @@ static inline void mconsole_register_dev(struct mc_device *new) #endif #endif - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/kernel/tt/gdb.c b/arch/um/kernel/tt/gdb.c index 786e4edd86c5..8eba8f7dca68 100644 --- a/arch/um/kernel/tt/gdb.c +++ b/arch/um/kernel/tt/gdb.c @@ -139,7 +139,7 @@ static void config_gdb_cb(void *arg) init_proxy(debugger_pid, 0, 0); } -int gdb_config(char *str) +int gdb_config(char *str, char **error_out) { struct gdb_data data; @@ -154,7 +154,7 @@ void remove_gdb_cb(void *unused) exit_debugger_cb(NULL); } -int gdb_remove(int unused) +int gdb_remove(int unused, char **error_out) { initial_thread_cb(remove_gdb_cb, NULL); return 0; diff --git a/arch/um/kernel/tt/gdb_kern.c b/arch/um/kernel/tt/gdb_kern.c index 68e1bf63cd0a..a1af96ef9ee2 100644 --- a/arch/um/kernel/tt/gdb_kern.c +++ b/arch/um/kernel/tt/gdb_kern.c @@ -8,8 +8,8 @@ #ifdef CONFIG_MCONSOLE -extern int gdb_config(char *str); -extern int gdb_remove(int n); +extern int gdb_config(char *str, char **error_out); +extern int gdb_remove(int n, char **error_out); static struct mc_device gdb_mc = { .name = "gdb", |