This is a note to let you know that I've just added the patch titled
vmxnet3: ensure that adapter is in proper state during force_close
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vmxnet3-ensure-that-adapter-is-in-proper-state-during-force_close.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Apr 10 10:31:53 CEST 2018
From: Neil Horman <nhorman@xxxxxxxxxxxxx>
Date: Fri, 12 May 2017 12:00:01 -0400
Subject: vmxnet3: ensure that adapter is in proper state during force_close
From: Neil Horman <nhorman@xxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxx>
CC: Shrikrishna Khare <skhare@xxxxxxxxxx>
CC: "VMware, Inc." <pv-drivers@xxxxxxxxxx>
CC: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -2789,6 +2789,11 @@ 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);
}
Patches currently in stable-queue which might be from nhorman@xxxxxxxxxxxxx are
queue-4.4/x86-asm-don-t-use-rbp-as-a-temporary-register-in-csum_partial_copy_generic.patch
queue-4.4/vmxnet3-ensure-that-adapter-is-in-proper-state-during-force_close.patch