netdev - [PATCH net-next 1/4] tg3: Fix link check in tg3_adjust

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <1329950121-18577-2-git-send-email-mcarlson@broadcom.com>
Date:	Wed, 22 Feb 2012 14:35:18 -0800
From:	"Matt Carlson" <mcarlson@...adcom.com>
To:	davem@...emloft.net
cc:	netdev@...r.kernel.org, mcarlson@...adcom.com, mchan@...adcom.com
Subject: [PATCH net-next 1/4] tg3: Fix link check in tg3_adjust_link

The tg3 driver tried to detect link changes by comparing the tg3 local
active_speed member with SPEED_UNKNOWN (or formerly SPEED_INVALID).
This check is not correct, since phylib will never set its speed member
to either of these two values.  The code only appeared to work because
tg3 initializes active_speed to SPEED_INVALID during tg3_init_one.  This
patch introduces a new "old_link" tg3 member and then compares the
phy_device's link member against it to detect link state changes.

Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
---
 drivers/net/ethernet/broadcom/tg3.c |    6 ++++--
 drivers/net/ethernet/broadcom/tg3.h |    1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index d604664..c56523e 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -1819,13 +1819,13 @@ static void tg3_adjust_link(struct net_device *dev)
 		      (6 << TX_LENGTHS_IPG_SHIFT) |
 		      (32 << TX_LENGTHS_SLOT_TIME_SHIFT)));
 
-	if ((phydev->link && tp->link_config.active_speed == SPEED_UNKNOWN) ||
-	    (!phydev->link && tp->link_config.active_speed != SPEED_UNKNOWN) ||
+	if (phydev->link != tp->old_link ||
 	    phydev->speed != tp->link_config.active_speed ||
 	    phydev->duplex != tp->link_config.active_duplex ||
 	    oldflowctrl != tp->link_config.active_flowctrl)
 		linkmesg = 1;
 
+	tp->old_link = phydev->link;
 	tp->link_config.active_speed = phydev->speed;
 	tp->link_config.active_duplex = phydev->duplex;
 
@@ -13352,6 +13352,8 @@ static void __devinit tg3_phy_init_link_config(struct tg3 *tp)
 	tp->link_config.autoneg = AUTONEG_ENABLE;
 	tp->link_config.active_speed = SPEED_UNKNOWN;
 	tp->link_config.active_duplex = DUPLEX_UNKNOWN;
+
+	tp->old_link = -1;
 }
 
 static int __devinit tg3_phy_probe(struct tg3 *tp)
diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index 22cbe74..66bcfca 100644
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -3064,6 +3064,7 @@ struct tg3 {
 
 	struct mii_bus			*mdio_bus;
 	int				mdio_irq[PHY_MAX_ADDR];
+	int				old_link;
 
 	u8				phy_addr;
 
-- 
1.7.3.4


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html