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authorNeilBrown <neilb@cse.unsw.edu.au>2005-06-21 17:17:26 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 19:07:46 -0700
commit3d310eb7b3df1252e8595d059d982b0a9825a137 (patch)
tree9bca5e7eaa437d60010c1745b9aeb9592439d482 /drivers/md/raid6main.c
parent41158c7eb22312cfaa256744e1553bb4042ff085 (diff)
downloadop-kernel-dev-3d310eb7b3df1252e8595d059d982b0a9825a137.zip
op-kernel-dev-3d310eb7b3df1252e8595d059d982b0a9825a137.tar.gz
[PATCH] md: fix deadlock due to md thread processing delayed requests.
Before completing a 'write' the md superblock might need to be updated. This is best done by the md_thread. The current code schedules this up and queues the write request for later handling by the md_thread. However some personalities (Raid5/raid6) will deadlock if the md_thread tries to submit requests to its own array. So this patch changes things so the processes submitting the request waits for the superblock to be written and then submits the request itself. This fixes a recently-created deadlock in raid5/raid6 Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/raid6main.c')
-rw-r--r--drivers/md/raid6main.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index d9c3854..f62ea1a 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -1570,8 +1570,7 @@ static int make_request (request_queue_t *q, struct bio * bi)
sector_t logical_sector, last_sector;
struct stripe_head *sh;
- if (md_write_start(mddev, bi)==0)
- return 0;
+ md_write_start(mddev, bi);
if (bio_data_dir(bi)==WRITE) {
disk_stat_inc(mddev->gendisk, writes);
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