linux-kernel - [PATCH 1/1] xen-blkback: do not wake up shutdown_wq after xen_blkif

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Message-Id: <1547646461-29803-1-git-send-email-dongli.zhang@oracle.com>
Date:   Wed, 16 Jan 2019 21:47:41 +0800
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     xen-devel@...ts.xenproject.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     konrad.wilk@...cle.com, roger.pau@...rix.com, axboe@...nel.dk
Subject: [PATCH 1/1] xen-blkback: do not wake up shutdown_wq after xen_blkif_schedule() is stopped

There is no need to wake up xen_blkif_schedule() as kthread_stop() is able
to already wake up the kernel thread.

Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
 drivers/block/xen-blkback/xenbus.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index a4bc74e..37ac59e 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -254,10 +254,8 @@ static int xen_blkif_disconnect(struct xen_blkif *blkif)
 		if (!ring->active)
 			continue;
 
-		if (ring->xenblkd) {
+		if (ring->xenblkd)
 			kthread_stop(ring->xenblkd);
-			wake_up(&ring->shutdown_wq);
-		}
 
 		/* The above kthread_stop() guarantees that at this point we
 		 * don't have any discard_io or other_io requests. So, checking
-- 
2.7.4