diff options
| -rw-r--r-- | drivers/usb/serial/io_ti.c | 223 |
1 files changed, 13 insertions, 210 deletions
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index 2e3d0acbc389..0fca2659206f 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -36,6 +36,7 @@ #include <linux/spinlock.h> #include <linux/mutex.h> #include <linux/serial.h> +#include <linux/kfifo.h> #include <linux/ioctl.h> #include <linux/firmware.h> #include <linux/uaccess.h> @@ -83,14 +84,6 @@ struct product_info { __u8 hardware_type; /* Type of hardware */ } __attribute__((packed)); -/* circular buffer */ -struct edge_buf { - unsigned int buf_size; - char *buf_buf; - char *buf_get; - char *buf_put; -}; - struct edgeport_port { __u16 uart_base; __u16 dma_address; @@ -114,7 +107,7 @@ struct edgeport_port { spinlock_t ep_lock; int ep_read_urb_state; int ep_write_urb_in_use; - struct edge_buf *ep_out_buf; + struct kfifo write_fifo; }; struct edgeport_serial { @@ -244,17 +237,6 @@ static void edge_send(struct tty_struct *tty); static int edge_create_sysfs_attrs(struct usb_serial_port *port); static int edge_remove_sysfs_attrs(struct usb_serial_port *port); -/* circular buffer */ -static struct edge_buf *edge_buf_alloc(unsigned int size); -static void edge_buf_free(struct edge_buf *eb); -static void edge_buf_clear(struct edge_buf *eb); -static unsigned int edge_buf_data_avail(struct edge_buf *eb); -static unsigned int edge_buf_space_avail(struct edge_buf *eb); -static unsigned int edge_buf_put(struct edge_buf *eb, const char *buf, - unsigned int count); -static unsigned int edge_buf_get(struct edge_buf *eb, char *buf, - unsigned int count); - static int ti_vread_sync(struct usb_device *dev, __u8 request, __u16 value, __u16 index, u8 *data, int size) @@ -585,7 +567,7 @@ static void chase_port(struct edgeport_port *port, unsigned long timeout, add_wait_queue(&tty->write_wait, &wait); for (;;) { set_current_state(TASK_INTERRUPTIBLE); - if (edge_buf_data_avail(port->ep_out_buf) == 0 + if (kfifo_len(&port->write_fifo) == 0 || timeout == 0 || signal_pending(current) || !usb_get_intfdata(port->port->serial->interface)) /* disconnect */ @@ -597,7 +579,7 @@ static void chase_port(struct edgeport_port *port, unsigned long timeout, set_current_state(TASK_RUNNING); remove_wait_queue(&tty->write_wait, &wait); if (flush) - edge_buf_clear(port->ep_out_buf); + kfifo_reset_out(&port->write_fifo); spin_unlock_irqrestore(&port->ep_lock, flags); tty_kref_put(tty); @@ -2084,7 +2066,6 @@ static int edge_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *data, int count) { struct edgeport_port *edge_port = usb_get_serial_port_data(port); - unsigned long flags; dbg("%s - port %d", __func__, port->number); @@ -2098,10 +2079,8 @@ static int edge_write(struct tty_struct *tty, struct usb_serial_port *port, if (edge_port->close_pending == 1) return -ENODEV; - spin_lock_irqsave(&edge_port->ep_lock, flags); - count = edge_buf_put(edge_port->ep_out_buf, data, count); - spin_unlock_irqrestore(&edge_port->ep_lock, flags); - + count = kfifo_in_locked(&edge_port->write_fifo, data, count, + &edge_port->ep_lock); edge_send(tty); return count; @@ -2124,7 +2103,7 @@ static void edge_send(struct tty_struct *tty) return; } - count = edge_buf_get(edge_port->ep_out_buf, + count = kfifo_out(&edge_port->write_fifo, port->write_urb->transfer_buffer, port->bulk_out_size); @@ -2180,7 +2159,7 @@ static int edge_write_room(struct tty_struct *tty) return 0; spin_lock_irqsave(&edge_port->ep_lock, flags); - room = edge_buf_space_avail(edge_port->ep_out_buf); + room = kfifo_avail(&edge_port->write_fifo); spin_unlock_irqrestore(&edge_port->ep_lock, flags); dbg("%s - returns %d", __func__, room); @@ -2202,7 +2181,7 @@ static int edge_chars_in_buffer(struct tty_struct *tty) return 0; spin_lock_irqsave(&edge_port->ep_lock, flags); - chars = edge_buf_data_avail(edge_port->ep_out_buf); + chars = kfifo_len(&edge_port->write_fifo); spin_unlock_irqrestore(&edge_port->ep_lock, flags); dbg("%s - returns %d", __func__, chars); @@ -2659,8 +2638,8 @@ static int edge_startup(struct usb_serial *serial) goto cleanup; } spin_lock_init(&edge_port->ep_lock); - edge_port->ep_out_buf = edge_buf_alloc(EDGE_OUT_BUF_SIZE); - if (edge_port->ep_out_buf == NULL) { + if (kfifo_alloc(&edge_port->write_fifo, EDGE_OUT_BUF_SIZE, + GFP_KERNEL)) { dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__); kfree(edge_port); @@ -2677,7 +2656,7 @@ static int edge_startup(struct usb_serial *serial) cleanup: for (--i; i >= 0; --i) { edge_port = usb_get_serial_port_data(serial->port[i]); - edge_buf_free(edge_port->ep_out_buf); + kfifo_free(&edge_port->write_fifo); kfree(edge_port); usb_set_serial_port_data(serial->port[i], NULL); } @@ -2708,7 +2687,7 @@ static void edge_release(struct usb_serial *serial) for (i = 0; i < serial->num_ports; ++i) { edge_port = usb_get_serial_port_data(serial->port[i]); - edge_buf_free(edge_port->ep_out_buf); + kfifo_free(&edge_port->write_fifo); kfree(edge_port); } kfree(usb_get_serial_data(serial)); @@ -2758,182 +2737,6 @@ static int edge_remove_sysfs_attrs(struct usb_serial_port *port) } -/* Circular Buffer */ - -/* - * edge_buf_alloc - * - * Allocate a circular buffer and all associated memory. - */ - -static struct edge_buf *edge_buf_alloc(unsigned int size) -{ - struct edge_buf *eb; - - - if (size == 0) - return NULL; - - eb = kmalloc(sizeof(struct edge_buf), GFP_KERNEL); - if (eb == NULL) - return NULL; - - eb->buf_buf = kmalloc(size, GFP_KERNEL); - if (eb->buf_buf == NULL) { - kfree(eb); - return NULL; - } - - eb->buf_size = size; - eb->buf_get = eb->buf_put = eb->buf_buf; - - return eb; -} - - -/* - * edge_buf_free - * - * Free the buffer and all associated memory. - */ - -static void edge_buf_free(struct edge_buf *eb) -{ - if (eb) { - kfree(eb->buf_buf); - kfree(eb); - } -} - - -/* - * edge_buf_clear - * - * Clear out all data in the circular buffer. - */ - -static void edge_buf_clear(struct edge_buf *eb) -{ - if (eb != NULL) - eb->buf_get = eb->buf_put; - /* equivalent to a get of all data available */ -} - - -/* - * edge_buf_data_avail - * - * Return the number of bytes of data available in the circular - * buffer. - */ - -static unsigned int edge_buf_data_avail(struct edge_buf *eb) -{ - if (eb == NULL) - return 0; - return ((eb->buf_size + eb->buf_put - eb->buf_get) % eb->buf_size); -} - - -/* - * edge_buf_space_avail - * - * Return the number of bytes of space available in the circular - * buffer. - */ - -static unsigned int edge_buf_space_avail(struct edge_buf *eb) -{ - if (eb == NULL) - return 0; - return ((eb->buf_size + eb->buf_get - eb->buf_put - 1) % eb->buf_size); -} - - -/* - * edge_buf_put - * - * Copy data data from a user buffer and put it into the circular buffer. - * Restrict to the amount of space available. - * - * Return the number of bytes copied. - */ - -static unsigned int edge_buf_put(struct edge_buf *eb, const char *buf, - unsigned int count) -{ - unsigned int len; - - - if (eb == NULL) - return 0; - - len = edge_buf_space_avail(eb); - if (count > len) - count = len; - - if (count == 0) - return 0; - - len = eb->buf_buf + eb->buf_size - eb->buf_put; - if (count > len) { - memcpy(eb->buf_put, buf, len); - memcpy(eb->buf_buf, buf+len, count - len); - eb->buf_put = eb->buf_buf + count - len; - } else { - memcpy(eb->buf_put, buf, count); - if (count < len) - eb->buf_put += count; - else /* count == len */ - eb->buf_put = eb->buf_buf; - } - - return count; -} - - -/* - * edge_buf_get - * - * Get data from the circular buffer and copy to the given buffer. - * Restrict to the amount of data available. - * - * Return the number of bytes copied. - */ - -static unsigned int edge_buf_get(struct edge_buf *eb, char *buf, - unsigned int count) -{ - unsigned int len; - - - if (eb == NULL) - return 0; - - len = edge_buf_data_avail(eb); - if (count > len) - count = len; - - if (count == 0) - return 0; - - len = eb->buf_buf + eb->buf_size - eb->buf_get; - if (count > len) { - memcpy(buf, eb->buf_get, len); - memcpy(buf+len, eb->buf_buf, count - len); - eb->buf_get = eb->buf_buf + count - len; - } else { - memcpy(buf, eb->buf_get, count); - if (count < len) - eb->buf_get += count; - else /* count == len */ - eb->buf_get = eb->buf_buf; - } - - return count; -} - - static struct usb_serial_driver edgeport_1port_device = { .driver = { .owner = THIS_MODULE, |