netdev - [PATCH] e100: fix typo in MDI/MDI-X eeprom check in e100_phy

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Message-Id: <1415980770-5467-1-git-send-email-linville@tuxdriver.com>
Date:	Fri, 14 Nov 2014 10:59:30 -0500
From:	"John W. Linville" <linville@...driver.com>
To:	netdev@...r.kernel.org
Cc:	Dave Miller <davem@...emloft.net>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Auke Kok <auke-jan.h.kok@...el.com>,
	Malli Chilakala <mallikarjuna.chilakala@...el.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [PATCH] e100: fix typo in MDI/MDI-X eeprom check in e100_phy_init

Although it doesn't explicitly say so, commit 60ffa478759f39a2 ("e100:
Fix MDIO/MDIO-X") appears to be intended to revert the earlier commit
648951451e6d2d53 ("e100: fixed e100 MDI/MDI-X issues").  However,
careful examination reveals that the attempted revert actually
_inverted_ the test for eeprom_mdix_enabled.  That is bound to program
a few PHYs incorrectly...

https://bugzilla.redhat.com/show_bug.cgi?id=1156417

Signed-off-by: John W. Linville <linville@...driver.com>
Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: Auke Kok <auke-jan.h.kok@...el.com>
Cc: Malli Chilakala <mallikarjuna.chilakala@...el.com>
---
Wow, an 8 year old bug in e100 -- woohoo!! :-)

This was causing some serious flakiness for a large cash register
deployment in Europe.  Testing with this one-line (really,
one-character) patch seems to have resolved the issue.

 drivers/net/ethernet/intel/e100.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 781065eb5431..e9c3a87e5b11 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -1543,7 +1543,7 @@ static int e100_phy_init(struct nic *nic)
 		mdio_write(netdev, nic->mii.phy_id, MII_BMCR, bmcr);
 	} else if ((nic->mac >= mac_82550_D102) || ((nic->flags & ich) &&
 	   (mdio_read(netdev, nic->mii.phy_id, MII_TPISTATUS) & 0x8000) &&
-		!(nic->eeprom[eeprom_cnfg_mdix] & eeprom_mdix_enabled))) {
+		(nic->eeprom[eeprom_cnfg_mdix] & eeprom_mdix_enabled))) {
 		/* enable/disable MDI/MDI-X auto-switching. */
 		mdio_write(netdev, nic->mii.phy_id, MII_NCONFIG,
 				nic->mii.force_media ? 0 : NCONFIG_AUTO_SWITCH);
-- 
1.9.3

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