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| author | Hugh Dickins <hugh@veritas.com> | 2007-03-06 19:20:11 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-06 17:59:14 -0800 |
| commit | 266d4f40370757459f8aa063976c932d0de5e59b (patch) | |
| tree | 315f882e2325b1485b55e0c2c029fb7e4173786f /fs/sysfs/inode.c | |
| parent | 7c368bb1049bde17fc4f8655492478d7f2918da9 (diff) | |
| download | lwn-266d4f40370757459f8aa063976c932d0de5e59b.tar.gz lwn-266d4f40370757459f8aa063976c932d0de5e59b.zip | |
[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/inode.c')
| -rw-r--r-- | fs/sysfs/inode.c | 5 |
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) mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD); if (node->i_private) { - list_for_each_entry(buf, &set->associates, associates) { - down(&buf->sem); + list_for_each_entry(buf, &set->associates, associates) buf->orphaned = 1; - up(&buf->sem); - } } mutex_unlock(&node->i_mutex); } |