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| author |   Tejun Heo <htejun@gmail.com> | 2007-09-20 16:05:12 +0900 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-12 14:51:11 -0700 |
| commit | a4e8b912541d5372ae049a3b7c1979968e52c40b (patch) | |
| tree | a95937748b6216f914abe55ed47c2627e7856bf7 /include/linux/kobject.h | |
| parent | sysfs: implement sysfs_open_dirent (diff) | |
| download | linux-dev-a4e8b912541d5372ae049a3b7c1979968e52c40b.tar.xz linux-dev-a4e8b912541d5372ae049a3b7c1979968e52c40b.zip | |
sysfs: move sysfs file poll implementation to sysfs_open_dirent
Sysfs file poll implementation is scattered over sysfs and kobject.
Event numbering is done in sysfs_dirent but wait itself is done on
kobject. This not only unecessarily bloats both kobject and
sysfs_dirent but is also buggy - if a sysfs_dirent is removed while
there still are pollers, the associaton betwen the kobject and
sysfs_dirent breaks and kobject may be freed with the pollers still
sleeping on it.
This patch moves whole poll implementation into sysfs_open_dirent.
Each time a sysfs_open_dirent is created, event number restarts from 1
and pollers sleep on sysfs_open_dirent. As event sequence number is
meaningless without any open file and pollers should have open file
and thus sysfs_open_dirent, this ephemeral event counting works and is
a saner implementation.
This patch fixes the dnagling sleepers bug and reduces the sizes of
kobject and sysfs_dirent by one pointer.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/kobject.h')
| -rw-r--r-- | include/linux/kobject.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/kobject.h b/include/linux/kobject.h index 0777b3f57ae6..a8a84fcccbc0 100644 --- a/include/linux/kobject.h +++ b/include/linux/kobject.h @@ -66,7 +66,6 @@ struct kobject { struct kset * kset; struct kobj_type * ktype; struct sysfs_dirent * sd; - wait_queue_head_t poll; }; extern int kobject_set_name(struct kobject *, const char *, ...) |