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authorAlan Stern <stern@rowland.harvard.edu>2007-03-15 15:51:28 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-15 15:29:26 -0700
commite7b0d26a86943370c04d6833c6edba2a72a6e240 (patch)
tree696e696176a1e72abb80afa6112fc057b39bf86b /fs/sysfs/inode.c
parentd9a9cdfb078d755e648d53ec25b7370f84ee5729 (diff)
[PATCH] sysfs: reinstate exclusion between method calls and attribute unregistration
This patch (as869) reinstates the mutual exclusion between sysfs attribute method calls and attribute unregistration. The previously-reported deadlocks have been fixed, and this exclusion is by far the simplest way to avoid races during driver unbinding. The check for orphaned read-buffers has been moved down slightly, so that the remainder of a partially-read buffer will still be available to userspace even after the attribute has been unregistered. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: Hugh Dickins <hugh@veritas.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Oliver Neukum <oneukum@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/sysfs/inode.c')
-rw-r--r--fs/sysfs/inode.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index ccb7d722c55..4de5c6b8991 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -222,13 +222,17 @@ const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
static inline void orphan_all_buffers(struct inode *node)
{
- struct sysfs_buffer_collection *set = node->i_private;
+ struct sysfs_buffer_collection *set;
struct sysfs_buffer *buf;
mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD);
- if (node->i_private) {
- list_for_each_entry(buf, &set->associates, associates)
+ set = node->i_private;
+ if (set) {
+ list_for_each_entry(buf, &set->associates, associates) {
+ down(&buf->sem);
buf->orphaned = 1;
+ up(&buf->sem);
+ }
}
mutex_unlock(&node->i_mutex);
}