qed: Fix possible race for the link state value.

[ Upstream commit 58874c7b246109d8efb2b0099d1aa296d6bfc3fa ]

There's a possible race where driver can read link status in mid-transition
and see that virtual-link is up yet speed is 0. Since in this
mid-transition we're guaranteed to see a mailbox from MFW soon, we can
afford to treat this as link down.

Fixes: cc875c2e ("qed: Add link support")
Signed-off-by: Sudarsana Reddy Kalluru <Sudarsana.Kalluru@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
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>

diff --git a/drivers/net/ethernet/qlogic/qed/qed_mcp.c b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
index c0674bcd9a8315ce1c9370f7b446072ae1fbbc2d..3c469355f5a4311f74fdeb259d11c77d4848c578 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_mcp.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
@@ -1182,6 +1182,7 @@ static void qed_mcp_handle_link_change(struct qed_hwfn *p_hwfn,
                break;
        default:
                p_link->speed = 0;
+               p_link->link_up = 0;
        }
 
        if (p_link->link_up && p_link->speed)