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qed: Fix possible race for the link state value.

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[ Upstream commit 58874c7b24 ]

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>
This commit is contained in:
Sudarsana Reddy Kalluru
2018-07-18 22:50:03 -07:00
committed by Greg Kroah-Hartman
parent 77c65d5f40
commit f4e284f1db
1 changed files with 1 additions and 0 deletions
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drivers/net/ethernet/qlogic/qed/qed_mcp.c
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@@ -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)