linux-kernel - [PATCH 4.19 52/67] net: mvpp2: fix detection of 10G SFP modules

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Date:   Thu, 20 Dec 2018 10:19:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Baruch Siach <baruch@...s.co.il>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 52/67] net: mvpp2: fix detection of 10G SFP modules

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 01b3fd5ac97caffb8e5d5bd85086da33db3b361f ]

The mvpp2_phylink_validate() relies on the interface field of
phylink_link_state to determine valid link modes. However, when called
from phylink_sfp_module_insert() this field in not initialized. The
default switch case then excludes 10G link modes. This allows 10G SFP
modules that are detected correctly to be configured at max rate of
2.5G.

Catch the uninitialized PHY mode case, and allow 10G rates.

Fixes: d97c9f4ab000b ("net: mvpp2: 1000baseX support")
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: Antoine Tenart <antoine.tenart@...tlin.com>
Acked-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Baruch Siach <baruch@...s.co.il>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index a74002b43b51..1b3b64fea038 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -4271,6 +4271,7 @@ static void mvpp2_phylink_validate(struct net_device *dev,
 
 	switch (state->interface) {
 	case PHY_INTERFACE_MODE_10GKR:
+	case PHY_INTERFACE_MODE_NA:
 		phylink_set(mask, 10000baseCR_Full);
 		phylink_set(mask, 10000baseSR_Full);
 		phylink_set(mask, 10000baseLR_Full);
-- 
2.19.1