linux-kernel - [PATCH AUTOSEL for 3.18 017/102] vmxnet3: ensure that adapter is in proper state during force

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Message-ID: <20180319161117.17833-17-alexander.levin@microsoft.com>
Date:   Mon, 19 Mar 2018 16:11:48 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Neil Horman <nhorman@...driver.com>,
        Shrikrishna Khare <skhare@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 3.18 017/102] vmxnet3: ensure that adapter is in
 proper state during force_close

From: Neil Horman <nhorman@...driver.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@...driver.com>
CC: Shrikrishna Khare <skhare@...are.com>
CC: "VMware, Inc." <pv-drivers@...are.com>
CC: "David S. Miller" <davem@...emloft.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/vmxnet3/vmxnet3_drv.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index a26ae97f755d..56a2bc86c439 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -2648,6 +2648,11 @@ 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);
 }

-- 
2.14.1