netif_device_attach() will unpause the queues so we can't call it before __alx_open(). This went undetected until commit b0999223f224 ("alx: add ability to allocate and free alx_napi structures") but now if stack tries to xmit immediately on resume before __alx_open() we'll crash on the NAPI being null:

BUG: kernel NULL pointer dereference, address: 0000000000000198 CPU: 0 PID: 12 Comm: ksoftirqd/0 Tainted: G OE 5.10.0-3-amd64 #1 Debian 5.10.13-1 Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./H77-D3H, BIOS F15 11/14/2013 RIP: 0010:alx_start_xmit+0x34/0x650 [alx] Code: 41 56 41 55 41 54 55 53 48 83 ec 20 0f b7 57 7c 8b 8e b0 0b 00 00 39 ca 72 06 89 d0 31 d2 f7 f1 89 d2 48 8b 84 df RSP: 0018:ffffb09240083d28 EFLAGS: 00010297 RAX: 0000000000000000 RBX: ffffa04d80ae7800 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffa04d80afa000 RDI: ffffa04e92e92a00 RBP: 0000000000000042 R08: 0000000000000100 R09: ffffa04ea3146700 R10: 0000000000000014 R11: 0000000000000000 R12: ffffa04e92e92100 R13: 0000000000000001 R14: ffffa04e92e92a00 R15: ffffa04e92e92a00 FS: 0000000000000000(0000) GS:ffffa0508f600000(0000) knlGS:0000000000000000 i915 0000:00:02.0: vblank wait timed out on crtc 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000198 CR3: 000000004460a001 CR4: 00000000001706f0 Call Trace: dev_hard_start_xmit+0xc7/0x1e0 sch_direct_xmit+0x10f/0x310

Cc: stable@vger.kernel.org # 4.9+ Fixes: bc2bebe8de8e ("alx: remove WoL support") Reported-by: Zbynek Michl zbynek.michl@gmail.com Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=983595 Signed-off-by: Jakub Kicinski kuba@kernel.org --- drivers/net/ethernet/atheros/alx/main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c index 9b7f1af5f574..9e02f8864593 100644 --- a/drivers/net/ethernet/atheros/alx/main.c +++ b/drivers/net/ethernet/atheros/alx/main.c @@ -1894,13 +1894,16 @@ static int alx_resume(struct device *dev)

if (!netif_running(alx->dev)) return 0; - netif_device_attach(alx->dev);

rtnl_lock(); err = __alx_open(alx, true); rtnl_unlock(); + if (err) + return err;

- return err; + netif_device_attach(alx->dev); + + return 0; }

static SIMPLE_DEV_PM_OPS(alx_pm_ops, alx_suspend, alx_resume);