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| author | Jens Axboe <jens.axboe@oracle.com> | 2007-09-14 09:57:54 +0200 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2007-10-17 21:30:35 +0200 |
| commit | c43386160e770cb29e78d370c25d8e1fc51ca260 (patch) | |
| tree | 94a5bf4712dd9a5b32064fb084cd24c1cfb803d8 | |
| parent | 73c3d061da9a50bdd17240440aa66647c72624a9 (diff) | |
| download | linux-stable-c43386160e770cb29e78d370c25d8e1fc51ca260.tar.gz linux-stable-c43386160e770cb29e78d370c25d8e1fc51ca260.tar.bz2 linux-stable-c43386160e770cb29e78d370c25d8e1fc51ca260.zip | |
[PATCH] Fix race with shared tag queue maps
The commit in Linus upstream git tree is
f3da54ba140c6427fa4a32913e1bf406f41b5dda.
Fix race with shared tag queue maps
There's a race condition in blk_queue_end_tag() for shared tag maps,
users include stex (promise supertrak thingy) and qla2xxx. The former
at least has reported bugs in this area, not sure why we haven't seen
any for the latter. It could be because the window is narrow and that
other conditions in the qla2xxx code hide this. It's a real bug,
though, as the stex smp users can attest.
We need to ensure two things - the tag bit clearing needs to happen
AFTER we cleared the tag pointer, as the tag bit clearing/setting is
what protects this map. Secondly, we need to ensure that the visibility
of the tag pointer and tag bit clear are ordered properly.
[ I removed the SMP barriers - "test_and_clear_bit()" already implies
all the required barriers. -- Linus ]
Also see http://bugzilla.kernel.org/show_bug.cgi?id=7842
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | block/ll_rw_blk.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 38c293b987b7..dbb01927cd25 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -1072,12 +1072,6 @@ void blk_queue_end_tag(request_queue_t *q, struct request *rq) */ return; - if (unlikely(!__test_and_clear_bit(tag, bqt->tag_map))) { - printk(KERN_ERR "%s: attempt to clear non-busy tag (%d)\n", - __FUNCTION__, tag); - return; - } - list_del_init(&rq->queuelist); rq->cmd_flags &= ~REQ_QUEUED; rq->tag = -1; @@ -1087,6 +1081,13 @@ void blk_queue_end_tag(request_queue_t *q, struct request *rq) __FUNCTION__, tag); bqt->tag_index[tag] = NULL; + + if (unlikely(!test_and_clear_bit(tag, bqt->tag_map))) { + printk(KERN_ERR "%s: attempt to clear non-busy tag (%d)\n", + __FUNCTION__, tag); + return; + } + bqt->busy--; } |