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path: root/drivers/base/core.c
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Diffstat (limited to 'drivers/base/core.c')
-rw-r--r--drivers/base/core.c111
1 files changed, 55 insertions, 56 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index d00ff3ec8f0f..b919e6d01d9a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -26,6 +26,7 @@
#include <linux/pm_runtime.h>
#include <linux/netdevice.h>
#include <linux/sched/signal.h>
+#include <linux/sched/mm.h>
#include <linux/sysfs.h>
#include "base.h"
@@ -239,27 +240,35 @@ void device_pm_move_to_tail(struct device *dev)
#define to_devlink(dev) container_of((dev), struct device_link, link_dev)
static ssize_t status_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+ struct device_attribute *attr, char *buf)
{
- char *status;
+ const char *output;
switch (to_devlink(dev)->status) {
case DL_STATE_NONE:
- status = "not tracked"; break;
+ output = "not tracked";
+ break;
case DL_STATE_DORMANT:
- status = "dormant"; break;
+ output = "dormant";
+ break;
case DL_STATE_AVAILABLE:
- status = "available"; break;
+ output = "available";
+ break;
case DL_STATE_CONSUMER_PROBE:
- status = "consumer probing"; break;
+ output = "consumer probing";
+ break;
case DL_STATE_ACTIVE:
- status = "active"; break;
+ output = "active";
+ break;
case DL_STATE_SUPPLIER_UNBIND:
- status = "supplier unbinding"; break;
+ output = "supplier unbinding";
+ break;
default:
- status = "unknown"; break;
+ output = "unknown";
+ break;
}
- return sprintf(buf, "%s\n", status);
+
+ return sysfs_emit(buf, "%s\n", output);
}
static DEVICE_ATTR_RO(status);
@@ -267,16 +276,16 @@ static ssize_t auto_remove_on_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct device_link *link = to_devlink(dev);
- char *str;
+ const char *output;
if (link->flags & DL_FLAG_AUTOREMOVE_SUPPLIER)
- str = "supplier unbind";
+ output = "supplier unbind";
else if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER)
- str = "consumer unbind";
+ output = "consumer unbind";
else
- str = "never";
+ output = "never";
- return sprintf(buf, "%s\n", str);
+ return sysfs_emit(buf, "%s\n", output);
}
static DEVICE_ATTR_RO(auto_remove_on);
@@ -285,7 +294,7 @@ static ssize_t runtime_pm_show(struct device *dev,
{
struct device_link *link = to_devlink(dev);
- return sprintf(buf, "%d\n", !!(link->flags & DL_FLAG_PM_RUNTIME));
+ return sysfs_emit(buf, "%d\n", !!(link->flags & DL_FLAG_PM_RUNTIME));
}
static DEVICE_ATTR_RO(runtime_pm);
@@ -294,7 +303,8 @@ static ssize_t sync_state_only_show(struct device *dev,
{
struct device_link *link = to_devlink(dev);
- return sprintf(buf, "%d\n", !!(link->flags & DL_FLAG_SYNC_STATE_ONLY));
+ return sysfs_emit(buf, "%d\n",
+ !!(link->flags & DL_FLAG_SYNC_STATE_ONLY));
}
static DEVICE_ATTR_RO(sync_state_only);
@@ -1059,7 +1069,7 @@ static ssize_t waiting_for_supplier_show(struct device *dev,
&& dev->links.need_for_probe;
mutex_unlock(&wfs_lock);
device_unlock(dev);
- return sprintf(buf, "%u\n", val);
+ return sysfs_emit(buf, "%u\n", val);
}
static DEVICE_ATTR_RO(waiting_for_supplier);
@@ -1709,7 +1719,7 @@ ssize_t device_show_ulong(struct device *dev,
char *buf)
{
struct dev_ext_attribute *ea = to_ext_attr(attr);
- return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
+ return sysfs_emit(buf, "%lx\n", *(unsigned long *)(ea->var));
}
EXPORT_SYMBOL_GPL(device_show_ulong);
@@ -1739,7 +1749,7 @@ ssize_t device_show_int(struct device *dev,
{
struct dev_ext_attribute *ea = to_ext_attr(attr);
- return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
+ return sysfs_emit(buf, "%d\n", *(int *)(ea->var));
}
EXPORT_SYMBOL_GPL(device_show_int);
@@ -1760,7 +1770,7 @@ ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
{
struct dev_ext_attribute *ea = to_ext_attr(attr);
- return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var));
+ return sysfs_emit(buf, "%d\n", *(bool *)(ea->var));
}
EXPORT_SYMBOL_GPL(device_show_bool);
@@ -1934,7 +1944,7 @@ static ssize_t uevent_show(struct device *dev, struct device_attribute *attr,
struct kset *kset;
struct kobj_uevent_env *env = NULL;
int i;
- size_t count = 0;
+ int len = 0;
int retval;
/* search the kset, the device belongs to */
@@ -1964,10 +1974,10 @@ static ssize_t uevent_show(struct device *dev, struct device_attribute *attr,
/* copy keys to file */
for (i = 0; i < env->envp_idx; i++)
- count += sprintf(&buf[count], "%s\n", env->envp[i]);
+ len += sysfs_emit_at(buf, len, "%s\n", env->envp[i]);
out:
kfree(env);
- return count;
+ return len;
}
static ssize_t uevent_store(struct device *dev, struct device_attribute *attr,
@@ -1994,7 +2004,7 @@ static ssize_t online_show(struct device *dev, struct device_attribute *attr,
device_lock(dev);
val = !dev->offline;
device_unlock(dev);
- return sprintf(buf, "%u\n", val);
+ return sysfs_emit(buf, "%u\n", val);
}
static ssize_t online_store(struct device *dev, struct device_attribute *attr,
@@ -3064,6 +3074,7 @@ void device_del(struct device *dev)
struct device *parent = dev->parent;
struct kobject *glue_dir = NULL;
struct class_interface *class_intf;
+ unsigned int noio_flag;
device_lock(dev);
kill_device(dev);
@@ -3075,6 +3086,7 @@ void device_del(struct device *dev)
/* Notify clients of device removal. This call must come
* before dpm_sysfs_remove().
*/
+ noio_flag = memalloc_noio_save();
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_DEL_DEVICE, dev);
@@ -3116,6 +3128,7 @@ void device_del(struct device *dev)
glue_dir = get_glue_dir(dev);
kobject_del(&dev->kobj);
cleanup_glue_dir(dev, glue_dir);
+ memalloc_noio_restore(noio_flag);
put_device(parent);
}
EXPORT_SYMBOL_GPL(device_del);
@@ -3326,7 +3339,7 @@ struct device *device_find_child_by_name(struct device *parent,
klist_iter_init(&parent->p->klist_children, &i);
while ((child = next_device(&i)))
- if (!strcmp(dev_name(child), name) && get_device(child))
+ if (sysfs_streq(dev_name(child), name) && get_device(child))
break;
klist_iter_exit(&i);
return child;
@@ -4063,22 +4076,21 @@ void device_shutdown(void)
*/
#ifdef CONFIG_PRINTK
-static int
-create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen)
+static void
+set_dev_info(const struct device *dev, struct dev_printk_info *dev_info)
{
const char *subsys;
- size_t pos = 0;
+
+ memset(dev_info, 0, sizeof(*dev_info));
if (dev->class)
subsys = dev->class->name;
else if (dev->bus)
subsys = dev->bus->name;
else
- return 0;
+ return;
- pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys);
- if (pos >= hdrlen)
- goto overflow;
+ strscpy(dev_info->subsystem, subsys, sizeof(dev_info->subsystem));
/*
* Add device identifier DEVICE=:
@@ -4094,41 +4106,28 @@ create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen)
c = 'b';
else
c = 'c';
- pos++;
- pos += snprintf(hdr + pos, hdrlen - pos,
- "DEVICE=%c%u:%u",
- c, MAJOR(dev->devt), MINOR(dev->devt));
+
+ snprintf(dev_info->device, sizeof(dev_info->device),
+ "%c%u:%u", c, MAJOR(dev->devt), MINOR(dev->devt));
} else if (strcmp(subsys, "net") == 0) {
struct net_device *net = to_net_dev(dev);
- pos++;
- pos += snprintf(hdr + pos, hdrlen - pos,
- "DEVICE=n%u", net->ifindex);
+ snprintf(dev_info->device, sizeof(dev_info->device),
+ "n%u", net->ifindex);
} else {
- pos++;
- pos += snprintf(hdr + pos, hdrlen - pos,
- "DEVICE=+%s:%s", subsys, dev_name(dev));
+ snprintf(dev_info->device, sizeof(dev_info->device),
+ "+%s:%s", subsys, dev_name(dev));
}
-
- if (pos >= hdrlen)
- goto overflow;
-
- return pos;
-
-overflow:
- dev_WARN(dev, "device/subsystem name too long");
- return 0;
}
int dev_vprintk_emit(int level, const struct device *dev,
const char *fmt, va_list args)
{
- char hdr[128];
- size_t hdrlen;
+ struct dev_printk_info dev_info;
- hdrlen = create_syslog_header(dev, hdr, sizeof(hdr));
+ set_dev_info(dev, &dev_info);
- return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args);
+ return vprintk_emit(0, level, &dev_info, fmt, args);
}
EXPORT_SYMBOL(dev_vprintk_emit);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-18 01:15:39 +0300