linux-kernel - [PATCH] net: lpc_eth: Fix crash on ip link up

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>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1409572006-26876-1-git-send-email-stigge@antcom.de>
Date:	Mon,  1 Sep 2014 13:46:46 +0200
From:	stigge@...com.de
To:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Roland Stigge <stigge@...com.de>
Subject: [PATCH] net: lpc_eth: Fix crash on ip link up

From: Roland Stigge <stigge@...com.de>

When a link is already up, the following sequence makes the kernel
block completely:

  ip link set dev eth0 down
  ip link set dev eth0 up

This is because on suspended phy, the following lines

  __lpc_eth_reset(pldat);
  __lpc_eth_init(pldat);

make the LPC ethernet core block (see LPC32x0 manual). The PHY needs to be
(re-)activated low-level first.

Signed-off-by: Roland Stigge <stigge@...com.de>
---
 Applies to v3.17-rc3

 drivers/net/ethernet/nxp/lpc_eth.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 8706c0d..a44a03c 100644
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1220,6 +1220,9 @@ static int lpc_eth_open(struct net_device *ndev)
 
 	__lpc_eth_clock_enable(pldat, true);
 
+	/* Suspended PHY makes LPC ethernet core block, so resume now */
+	phy_resume(pldat->phy_dev);
+
 	/* Reset and initialize */
 	__lpc_eth_reset(pldat);
 	__lpc_eth_init(pldat);
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/