From: Nithin Sujir Date: Thu, 6 Feb 2014 22:13:05 +0000 (-0800) Subject: tg3: Fix deadlock in tg3_change_mtu() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c6993dfd7db9b0c6b7ca7503a56fda9236a4710f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git tg3: Fix deadlock in tg3_change_mtu() Quoting David Vrabel - "5780 cards cannot have jumbo frames and TSO enabled together. When jumbo frames are enabled by setting the MTU, the TSO feature must be cleared. This is done indirectly by calling netdev_update_features() which will call tg3_fix_features() to actually clear the flags. netdev_update_features() will also trigger a new netlink message for the feature change event which will result in a call to tg3_get_stats64() which deadlocks on the tg3 lock." tg3_set_mtu() does not need to be under the tg3 lock since converting the flags to use set_bit(). Move it out to after tg3_netif_stop(). Reported-by: David Vrabel Tested-by: David Vrabel Signed-off-by: Michael Chan Signed-off-by: Nithin Nayak Sujir Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index c466e12b601e..3167ed6593b0 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -14114,12 +14114,12 @@ static int tg3_change_mtu(struct net_device *dev, int new_mtu) tg3_netif_stop(tp); + tg3_set_mtu(dev, tp, new_mtu); + tg3_full_lock(tp, 1); tg3_halt(tp, RESET_KIND_SHUTDOWN, 1); - tg3_set_mtu(dev, tp, new_mtu); - /* Reset PHY, otherwise the read DMA engine will be in a mode that * breaks all requests to 256 bytes. */