From aeb20b6b3f4e1f88ce6a2802dabc667b607412ef Mon Sep 17 00:00:00 2001 From: Iyappan Subramanian Date: Mon, 23 Nov 2015 12:04:52 -0800 Subject: [PATCH] drivers: net: xgene: fix: ifconfig up/down crash Fixing kernel crash when doing ifconfig down and up in a loop, [ 124.028237] Call trace: [ 124.030670] [] memcpy+0x20/0x180 [ 124.035436] [] skb_clone+0x3c/0xa8 [ 124.040374] [] __skb_tstamp_tx+0xc0/0x118 [ 124.045918] [] skb_tstamp_tx+0x10/0x1c [ 124.051203] [] xgene_enet_start_xmit+0x2e4/0x33c [ 124.057352] [] dev_hard_start_xmit+0x2e8/0x400 [ 124.063327] [] sch_direct_xmit+0x90/0x1d4 [ 124.068870] [] __dev_queue_xmit+0x28c/0x498 [ 124.074585] [] dev_queue_xmit_sk+0x10/0x1c [ 124.080216] [] ip_finish_output2+0x3d0/0x438 [ 124.086017] [] ip_finish_output+0x198/0x1ac [ 124.091732] [] ip_output+0xec/0x164 [ 124.096755] [] ip_local_out_sk+0x38/0x48 [ 124.102211] [] ip_queue_xmit+0x288/0x330 [ 124.107668] [] tcp_transmit_skb+0x908/0x964 [ 124.113383] [] tcp_send_ack+0x128/0x138 [ 124.118753] [] __tcp_ack_snd_check+0x5c/0x94 [ 124.124555] [] tcp_rcv_established+0x554/0x68c [ 124.130530] [] tcp_v4_do_rcv+0xa4/0x37c [ 124.135900] [] release_sock+0xb4/0x150 [ 124.141184] [] tcp_recvmsg+0x448/0x9e0 [ 124.146468] [] inet_recvmsg+0xa0/0xc0 [ 124.151666] [] sock_recvmsg+0x10/0x1c [ 124.156863] [] SyS_recvfrom+0xa4/0xf8 [ 124.162061] Code: f2400c84 540001c0 cb040042 36000064 (38401423) [ 124.168133] ---[ end trace 7ab2550372e8a65b ]--- The fix was to reorder napi_enable, napi_disable, request_irq and free_irq calls, move register_netdev after dma_coerce_mask_and_coherent. Signed-off-by: Iyappan Subramanian Tested-by: Khuong Dinh Signed-off-by: David S. Miller --- .../net/ethernet/apm/xgene/xgene_enet_main.c | 29 ++++++++++--------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c index 991412ce6f48..1adfe7036843 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c @@ -688,10 +688,10 @@ static int xgene_enet_open(struct net_device *ndev) mac_ops->tx_enable(pdata); mac_ops->rx_enable(pdata); + xgene_enet_napi_enable(pdata); ret = xgene_enet_register_irq(ndev); if (ret) return ret; - xgene_enet_napi_enable(pdata); if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) phy_start(pdata->phy_dev); @@ -715,13 +715,13 @@ static int xgene_enet_close(struct net_device *ndev) else cancel_delayed_work_sync(&pdata->link_work); - xgene_enet_napi_disable(pdata); - xgene_enet_free_irq(ndev); - xgene_enet_process_ring(pdata->rx_ring, -1); - mac_ops->tx_disable(pdata); mac_ops->rx_disable(pdata); + xgene_enet_free_irq(ndev); + xgene_enet_napi_disable(pdata); + xgene_enet_process_ring(pdata->rx_ring, -1); + return 0; } @@ -1474,15 +1474,15 @@ static int xgene_enet_probe(struct platform_device *pdev) } ndev->hw_features = ndev->features; - ret = register_netdev(ndev); + ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); if (ret) { - netdev_err(ndev, "Failed to register netdev\n"); + netdev_err(ndev, "No usable DMA configuration\n"); goto err; } - ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); + ret = register_netdev(ndev); if (ret) { - netdev_err(ndev, "No usable DMA configuration\n"); + netdev_err(ndev, "Failed to register netdev\n"); goto err; } @@ -1490,14 +1490,17 @@ static int xgene_enet_probe(struct platform_device *pdev) if (ret) goto err; - xgene_enet_napi_add(pdata); mac_ops = pdata->mac_ops; - if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) + if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) { ret = xgene_enet_mdio_config(pdata); - else + if (ret) + goto err; + } else { INIT_DELAYED_WORK(&pdata->link_work, mac_ops->link_state); + } - return ret; + xgene_enet_napi_add(pdata); + return 0; err: unregister_netdev(ndev); free_netdev(ndev); -- 2.30.2