netdev - [net PATCH] atl1c: Fix misuse of netdev_alloc

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Message-Id: <1374857234-1442-1-git-send-email-nhorman@tuxdriver.com>
Date:	Fri, 26 Jul 2013 12:47:14 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	netdev@...r.kernel.org
Cc:	Neil Horman <nhorman@...driver.com>,
	Jay Cliburn <jcliburn@...il.com>,
	"David S. Miller" <davem@...emloft.net>, stable@...r.kernel.org
Subject: [net PATCH] atl1c: Fix misuse of netdev_alloc_skb in refilling rx ring

atl1c uses netdev_alloc_skb to refill its rx dma ring, but that call makes no
guarantees about the suitability of the memory for use in DMA.  As a result
we've gotten reports of atl1c drivers occasionally hanging and needing to be
reset:
https://bugzilla.kernel.org/show_bug.cgi?id=54021

Fix this by modifying the call to use the internal version __netdev_alloc_skb,
where you can set the gfp_mask explicitly to include GFP_DMA.

Tested by two reporters in the above bug, who have the hardware to validate it.
Both report immediate cessation of the problem with this patch

Signed-off-by: Neil Horman <nhorman@...driver.com>
CC: Jay Cliburn <jcliburn@...il.com>
CC: "David S. Miller" <davem@...emloft.net>
CC: stable@...r.kernel.org
Tested-by: Luis Henrix <luis.henrix@...il.com>
Tested-by: Vincent Alquier <vincent.alquier@...il.com>
---
 drivers/net/ethernet/atheros/atl1c/atl1c_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
index 786a874..d5e38d1 100644
--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -1660,7 +1660,7 @@ static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter)
 	while (next_info->flags & ATL1C_BUFFER_FREE) {
 		rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);
 
-		skb = netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len);
+		skb = __netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len, GFP_ATOMIC|GFP_DMA);
 		if (unlikely(!skb)) {
 			if (netif_msg_rx_err(adapter))
 				dev_warn(&pdev->dev, "alloc rx buffer failed\n");
-- 
1.8.1.4

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