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| author | Jes Sorensen <jes@sgi.com> | 2006-02-06 14:12:43 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-03-20 13:42:58 -0800 |
| commit | 58383af629efb07e5a0694e445eda0c65b16e1de (patch) | |
| tree | 228369b2e56411c91ee1356957c0aa2dc0d033e5 /fs/char_dev.c | |
| parent | 8b5536bbee53620f8d5f367987e5727ba36d886d (diff) | |
| download | lwn-58383af629efb07e5a0694e445eda0c65b16e1de.tar.gz lwn-58383af629efb07e5a0694e445eda0c65b16e1de.zip | |
[PATCH] kobj_map semaphore to mutex conversion
Convert the kobj_map code to use a mutex instead of a semaphore. It
converts the single two users as well, genhd.c and char_dev.c.
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/char_dev.c')
| -rw-r--r-- | fs/char_dev.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c index 21195c481637..5c36345c9bf7 100644 --- a/fs/char_dev.c +++ b/fs/char_dev.c @@ -19,6 +19,7 @@ #include <linux/kobject.h> #include <linux/kobj_map.h> #include <linux/cdev.h> +#include <linux/mutex.h> #ifdef CONFIG_KMOD #include <linux/kmod.h> @@ -28,7 +29,7 @@ static struct kobj_map *cdev_map; #define MAX_PROBE_HASH 255 /* random */ -static DECLARE_MUTEX(chrdevs_lock); +static DEFINE_MUTEX(chrdevs_lock); static struct char_device_struct { struct char_device_struct *next; @@ -88,13 +89,13 @@ out: void *acquire_chrdev_list(void) { - down(&chrdevs_lock); + mutex_lock(&chrdevs_lock); return get_next_chrdev(NULL); } void release_chrdev_list(void *dev) { - up(&chrdevs_lock); + mutex_unlock(&chrdevs_lock); kfree(dev); } @@ -151,7 +152,7 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor, memset(cd, 0, sizeof(struct char_device_struct)); - down(&chrdevs_lock); + mutex_lock(&chrdevs_lock); /* temporary */ if (major == 0) { @@ -186,10 +187,10 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor, } cd->next = *cp; *cp = cd; - up(&chrdevs_lock); + mutex_unlock(&chrdevs_lock); return cd; out: - up(&chrdevs_lock); + mutex_unlock(&chrdevs_lock); kfree(cd); return ERR_PTR(ret); } @@ -200,7 +201,7 @@ __unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct) struct char_device_struct *cd = NULL, **cp; int i = major_to_index(major); - down(&chrdevs_lock); + mutex_lock(&chrdevs_lock); for (cp = &chrdevs[i]; *cp; cp = &(*cp)->next) if ((*cp)->major == major && (*cp)->baseminor == baseminor && @@ -210,7 +211,7 @@ __unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct) cd = *cp; *cp = cd->next; } - up(&chrdevs_lock); + mutex_unlock(&chrdevs_lock); return cd; } |