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 <[email protected]> CC: Jay Cliburn <[email protected]> CC: "David S. Miller" <[email protected]> CC: [email protected] Tested-by: Luis Henrix <[email protected]> Tested-by: Vincent Alquier <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
