Commit ebe7fdba authored by Neil Horman's avatar Neil Horman Committed by David S. Miller

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: default avatarNeil Horman <nhorman@tuxdriver.com>
CC: Jay Cliburn <jcliburn@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: stable@vger.kernel.org
Tested-by: default avatarLuis Henriques <luis.henriques@canonical.com>
Tested-by: default avatarVincent Alquier <vincent.alquier@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c80dc13d
...@@ -1660,7 +1660,7 @@ static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter) ...@@ -1660,7 +1660,7 @@ static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter)
while (next_info->flags & ATL1C_BUFFER_FREE) { while (next_info->flags & ATL1C_BUFFER_FREE) {
rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use); 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 (unlikely(!skb)) {
if (netif_msg_rx_err(adapter)) if (netif_msg_rx_err(adapter))
dev_warn(&pdev->dev, "alloc rx buffer failed\n"); dev_warn(&pdev->dev, "alloc rx buffer failed\n");
......
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