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Make completion wakeup dependent on active status
author
Jens Axboe
<jaxboe@fusionio.com>
Fri, 8 Oct 2010 18:21:08 +0000
(20:21 +0200)
committer
Jens Axboe
<jaxboe@fusionio.com>
Fri, 8 Oct 2010 18:21:08 +0000
(20:21 +0200)
This way we can avoid grabbing a per-dev lock completely
on IO completion.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
main.c
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diff --git
a/main.c
b/main.c
index 7261999e44af59b42c6651c3da1e729dc0b549a7..0981b36c0860cba5e038c8d66b722945d17793c4 100644
(file)
--- a/
main.c
+++ b/
main.c
@@
-326,7
+326,9
@@
static void b_cmd_endio(struct bio *bio, int error)
atomic_dec(&bd->in_flight);
- wake_up(&bd->wq_done);
+ smp_mb();
+ if (waitqueue_active(&bd->wq_done))
+ wake_up(&bd->wq_done);
}
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)