netdev - [PATCH net-next 2/4] net: phy: sfp: Use correct endian for sfp->id.ext.options

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Message-Id: <20171108034911.16382-3-f.fainelli@gmail.com>
Date:   Tue,  7 Nov 2017 19:49:09 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, andrew@...n.ch, rmk+kernel@...linux.org.uk,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next 2/4] net: phy: sfp: Use correct endian for sfp->id.ext.options

The extended ID options 16-bit value is big-endian (and actually annotated as
such), but we would be accessing it with our CPU endian, which would not
allow the correct detection of whether the LOS signal is inverted or not.

Fixes: 73970055450e ("sfp: add SFP module support")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/phy/sfp.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 942288aa9cdb..dfb28b269687 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -355,7 +355,7 @@ static void sfp_sm_link_check_los(struct sfp *sfp)
 	 * SFP_OPTIONS_LOS_NORMAL are set?  For now, we assume
 	 * the same as SFP_OPTIONS_LOS_NORMAL set.
 	 */
-	if (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED)
+	if (be16_to_cpu(sfp->id.ext.options) & SFP_OPTIONS_LOS_INVERTED)
 		los ^= SFP_F_LOS;
 
 	if (los)
@@ -583,7 +583,8 @@ static void sfp_sm_event(struct sfp *sfp, unsigned int event)
 		if (event == SFP_E_TX_FAULT)
 			sfp_sm_fault(sfp, true);
 		else if (event ==
-			 (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED ?
+			 (be16_to_cpu(sfp->id.ext.options) &
+			  SFP_OPTIONS_LOS_INVERTED ?
 			  SFP_E_LOS_HIGH : SFP_E_LOS_LOW))
 			sfp_sm_link_up(sfp);
 		break;
@@ -593,7 +594,8 @@ static void sfp_sm_event(struct sfp *sfp, unsigned int event)
 			sfp_sm_link_down(sfp);
 			sfp_sm_fault(sfp, true);
 		} else if (event ==
-			   (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED ?
+			   (be16_to_cpu(sfp->id.ext.options) &
+			    SFP_OPTIONS_LOS_INVERTED ?
 			    SFP_E_LOS_LOW : SFP_E_LOS_HIGH)) {
 			sfp_sm_link_down(sfp);
 			sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
-- 
2.14.1