From: Neil Horman Date: Fri, 12 May 2017 16:00:01 +0000 (-0400) Subject: vmxnet3: ensure that adapter is in proper state during force_close X-Git-Tag: v4.4.128~165 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7d74c63d62b7fcbd76dd324755755a71fec23a79;p=profile%2Fcommon%2Fplatform%2Fkernel%2Flinux-artik7.git vmxnet3: ensure that adapter is in proper state during force_close [ Upstream commit 1c4d5f51a812a82de97beee24f48ed05c65ebda5 ] There are several paths in vmxnet3, where settings changes cause the adapter to be brought down and back up (vmxnet3_set_ringparam among them). Should part of the reset operation fail, these paths call vmxnet3_force_close, which enables all napi instances prior to calling dev_close (with the expectation that vmxnet3_close will then properly disable them again). However, vmxnet3_force_close neglects to clear VMXNET3_STATE_BIT_QUIESCED prior to calling dev_close. As a result vmxnet3_quiesce_dev (called from vmxnet3_close), returns early, and leaves all the napi instances in a enabled state while the device itself is closed. If a device in this state is activated again, napi_enable will be called on already enabled napi_instances, leading to a BUG halt. The fix is to simply enausre that the QUIESCED bit is cleared in vmxnet3_force_close to allow quesence to be completed properly on close. Signed-off-by: Neil Horman CC: Shrikrishna Khare CC: "VMware, Inc." CC: "David S. Miller" Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c index 82bf85a..419c045 100644 --- a/drivers/net/vmxnet3/vmxnet3_drv.c +++ b/drivers/net/vmxnet3/vmxnet3_drv.c @@ -2789,6 +2789,11 @@ vmxnet3_force_close(struct vmxnet3_adapter *adapter) /* we need to enable NAPI, otherwise dev_close will deadlock */ for (i = 0; i < adapter->num_rx_queues; i++) napi_enable(&adapter->rx_queue[i].napi); + /* + * Need to clear the quiesce bit to ensure that vmxnet3_close + * can quiesce the device properly + */ + clear_bit(VMXNET3_STATE_BIT_QUIESCED, &adapter->state); dev_close(adapter->netdev); }