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authorMikulas Patocka <mpatocka@redhat.com>2008-11-13 23:39:10 +0000
committerAlasdair G Kergon <agk@redhat.com>2008-11-13 23:39:10 +0000
commitd221d2e77696e70e94b13989ea15db2ba5b34f8e (patch)
tree82afcee59db83104d31848e2304eb51baeee3aa4 /drivers/md
parent14e98c5ca8bed825f65cbf11cb0ffd2c09dac2f4 (diff)
dm: move pending queue wake_up end_io_acct
This doesn't fix any bug, just moves wake_up immediately after decrementing md->pending, for better code readability. It must be clear to anyone manipulating md->pending to wake up the queue if md->pending reaches zero, so move the wakeup as close to the decrementing as possible. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 6963ad14840..dc25d8a07bc 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -375,7 +375,7 @@ static void start_io_acct(struct dm_io *io)
dm_disk(md)->part0.in_flight = atomic_inc_return(&md->pending);
}
-static int end_io_acct(struct dm_io *io)
+static void end_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;
struct bio *bio = io->bio;
@@ -391,7 +391,9 @@ static int end_io_acct(struct dm_io *io)
dm_disk(md)->part0.in_flight = pending =
atomic_dec_return(&md->pending);
- return !pending;
+ /* nudge anyone waiting on suspend queue */
+ if (!pending)
+ wake_up(&md->wait);
}
/*
@@ -499,9 +501,7 @@ static void dec_pending(struct dm_io *io, int error)
spin_unlock_irqrestore(&io->md->pushback_lock, flags);
}
- if (end_io_acct(io))
- /* nudge anyone waiting on suspend queue */
- wake_up(&io->md->wait);
+ end_io_acct(io);
if (io->error != DM_ENDIO_REQUEUE) {
blk_add_trace_bio(io->md->queue, io->bio,