linux-kernel - [patch] mic_virtio: fix a timeout loop

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Message-ID: <20151215101128.GE20848@mwanda>
Date:	Tue, 15 Dec 2015 13:11:28 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	linux-kernel@...r.kernel.org, Sudeep Dutt <sudeep.dutt@...el.com>,
	Ashutosh Dixit <ashutosh.dixit@...el.com>
Cc:	kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [patch] mic_virtio: fix a timeout loop

After the loop we test "if (!retry)" to see if we timedout.  The problem
is "retry--" is a post-op so retry will be -1 at the end of the loop.  I
have fixed this by changing it to a pre-op instead.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/misc/mic/card/mic_virtio.c b/drivers/misc/mic/card/mic_virtio.c
index e486a0c..b3ad9c4 100644
--- a/drivers/misc/mic/card/mic_virtio.c
+++ b/drivers/misc/mic/card/mic_virtio.c
@@ -337,7 +337,7 @@ static int mic_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 	 * rings have been re-assigned.
 	 */
 	mic_send_intr(mvdev->mdev, mvdev->c2h_vdev_db);
-	for (retry = 100; retry--;) {
+	for (retry = 100; --retry;) {
 		if (!ioread8(&dc->used_address_updated))
 			break;
 		msleep(100);
--
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