From 493933472d33d3e82d6323842edeb281199ee430 Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Fri, 28 Jul 2017 08:59:46 -0700 Subject: [PATCH] netvsc: fix error unwind on device setup failure If setting receive buffer fails, the error unwind would cause kernel panic because it was not correctly doing RCU and NAPI unwind. RCU'd pointer needs to be reset to NULL, and NAPI needs to be disabled not deleted. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- drivers/net/hyperv/netvsc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 4c709b4..db95487 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -1307,7 +1307,8 @@ struct netvsc_device *netvsc_device_add(struct hv_device *device, return net_device; close: - netif_napi_del(&net_device->chan_table[0].napi); + RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); + napi_disable(&net_device->chan_table[0].napi); /* Now, we can close the channel safely */ vmbus_close(device->channel); -- 2.7.4