tree 54d907607d58aa3a9820c7070ec76a159a209ff3
parent 1819e40908ee76c7219287224c22c772556c927e
author Xi Wang <wangxi11@huawei.com> 1528290472 +0100
committer David S. Miller <davem@davemloft.net> 1528308168 -0400

net: hns3: Fix for VF mailbox receiving unknown message

Before the firmware updates the crq's tail pointer, if the VF driver
reads the data in the crq, the data may be incomplete at this time,
which will lead to the driver read an unknown message.

This patch fixes it by checking if crq is empty before reading the
message.

Fixes: b11a0bb231f3 ("net: hns3: Add mailbox support to VF driver")
Signed-off-by: Xi Wang <wangxi11@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>