diff options
author | NeilBrown <neilb@suse.de> | 2007-01-26 00:57:11 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 13:51:00 -0800 |
commit | 2a2275d630b982e5f90206f9bc497f6695a3ec5d (patch) | |
tree | 88cddee709b2107b74e5424810d4ffb6e3772382 /ipc/mqueue.c | |
parent | a0ad13ef643a5829d63c456ab6143bbda60b44a9 (diff) |
[PATCH] md: fix potential memalloc deadlock in md
If a GFP_KERNEL allocation is attempted in md while the mddev_lock is held,
it is possible for a deadlock to eventuate.
This happens if the array was marked 'clean', and the memalloc triggers a
write-out to the md device.
For the writeout to succeed, the array must be marked 'dirty', and that
requires getting the mddev_lock.
So, before attempting a GFP_KERNEL allocation while holding the lock, make
sure the array is marked 'dirty' (unless it is currently read-only).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/mqueue.c')
0 files changed, 0 insertions, 0 deletions