3.18-stable review patch. If anyone has any objections, please let me know.
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From: Neil Horman nhorman@tuxdriver.com
[ 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 nhorman@tuxdriver.com CC: Shrikrishna Khare skhare@vmware.com CC: "VMware, Inc." pv-drivers@vmware.com CC: "David S. Miller" davem@davemloft.net Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/vmxnet3/vmxnet3_drv.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/net/vmxnet3/vmxnet3_drv.c +++ b/drivers/net/vmxnet3/vmxnet3_drv.c @@ -2648,6 +2648,11 @@ vmxnet3_force_close(struct vmxnet3_adapt /* 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); }