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authorHugh Dickins <hugh@veritas.com>2007-03-06 14:20:11 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-06 20:59:14 -0500
commit266d4f40370757459f8aa063976c932d0de5e59b (patch)
tree315f882e2325b1485b55e0c2c029fb7e4173786f /fs/sysfs
parent7c368bb1049bde17fc4f8655492478d7f2918da9 (diff)
[PATCH] suspend regression: sysfs deadlock
Suspend deadlocks when trying to unregister /sys/block/sr0. This comes from Oliver's commit 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7 "Driver core: fix race in sysfs between sysfs_remove_file() and read()/write()". sysfs_write_file downs buffer->sem while calling flush_write_buffer, and flushing that particular write buffer entails downing buffer->sem in orphan_all_buffers, resulting in the obvious self-deadlock. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/inode.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index dd1344b007f5..ccb7d722c558 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -227,11 +227,8 @@ static inline void orphan_all_buffers(struct inode *node)
227 227
228 mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD); 228 mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD);
229 if (node->i_private) { 229 if (node->i_private) {
230 list_for_each_entry(buf, &set->associates, associates) { 230 list_for_each_entry(buf, &set->associates, associates)
231 down(&buf->sem);
232 buf->orphaned = 1; 231 buf->orphaned = 1;
233 up(&buf->sem);
234 }
235 } 232 }
236 mutex_unlock(&node->i_mutex); 233 mutex_unlock(&node->i_mutex);
237} 234}