[PATCH] suspend regression: sysfs deadlock
authorHugh Dickins <hugh@veritas.com>
Tue, 6 Mar 2007 19:20:11 +0000 (19:20 +0000)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Wed, 7 Mar 2007 01:59:14 +0000 (17:59 -0800)
commit266d4f40370757459f8aa063976c932d0de5e59b
tree315f882e2325b1485b55e0c2c029fb7e4173786f
parent7c368bb1049bde17fc4f8655492478d7f2918da9
[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>
fs/sysfs/inode.c