linux-kernel - [PATCH 4.2.y-ckt 266/305] amd-xgbe: fix a couple timeout loops

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Date:	Fri, 15 Jan 2016 16:01:20 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 266/305] amd-xgbe: fix a couple timeout loops

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit c7557e6a56510ff6636d40ad4ff64a3ef7d9e197 upstream.

At the end of the loop we test "if (!count)" but because "count--" is
a post-op then the loop will end with count set to -1.  I have fixed
this by changing it to --count.

Fixes: c5aa9e3b8156 ('amd-xgbe: Initial AMD 10GbE platform driver')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/amd/xgbe/xgbe-dev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
index f672dba..7b64623 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
@@ -1849,7 +1849,7 @@ static int xgbe_exit(struct xgbe_prv_data *pdata)
 	usleep_range(10, 15);
 
 	/* Poll Until Poll Condition */
-	while (count-- && XGMAC_IOREAD_BITS(pdata, DMA_MR, SWR))
+	while (--count && XGMAC_IOREAD_BITS(pdata, DMA_MR, SWR))
 		usleep_range(500, 600);
 
 	if (!count)
@@ -1873,7 +1873,7 @@ static int xgbe_flush_tx_queues(struct xgbe_prv_data *pdata)
 	/* Poll Until Poll Condition */
 	for (i = 0; i < pdata->tx_q_count; i++) {
 		count = 2000;
-		while (count-- && XGMAC_MTL_IOREAD_BITS(pdata, i,
+		while (--count && XGMAC_MTL_IOREAD_BITS(pdata, i,
 							MTL_Q_TQOMR, FTQ))
 			usleep_range(500, 600);
 
-- 
1.9.1