4.4-stable review patch. If anyone has any objections, please let me know.
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From: Sudarsana Reddy Kalluru sudarsana.kalluru@cavium.com
[ 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 --- drivers/net/ethernet/qlogic/qed/qed_mcp.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/net/ethernet/qlogic/qed/qed_mcp.c +++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.c @@ -420,6 +420,7 @@ static void qed_mcp_handle_link_change(s break; default: p_link->speed = 0; + p_link->link_up = 0; }
/* Correct speed according to bandwidth allocation */