netdev - [PATCH] mv643xx_eth: prevent interrupt storm on ifconfig down

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]

Date:	Mon, 19 Jan 2009 11:09:21 +0100
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	David Miller <davem@...emloft.net>
Cc:	tbm@...ius.com, pacman@...h.dhis.org, netdev@...r.kernel.org,
	Matt Sealey <matt@...esi-usa.com>,
	Gabriel Paubert <paubert@...m.es>
Subject: [PATCH] mv643xx_eth: prevent interrupt storm on ifconfig down

From: Gabriel Paubert <paubert@...m.es>

Contrary to what the docs say, the 'extended interrupt cause' bit in
the interrupt cause register (bit 1) appears to not be maskable on at
least some of the mv643xx_eth platforms, making writing zeroes to the
interrupt mask register but not the extended interrupt mask register
insufficient to stop interrupts from occuring.  Therefore, also write
zeroes to the extended interrupt mask register when shutting down the
port.

This fixes the interrupt storm seen on the Pegasos board when shutting
down the interface.

Signed-off-by: Lennert Buytenhek <buytenh@...vell.com>
---
 drivers/net/mv643xx_eth.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 8c6979a..5f31bbb 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -2212,6 +2212,7 @@ static int mv643xx_eth_stop(struct net_device *dev)
 	struct mv643xx_eth_private *mp = netdev_priv(dev);
 	int i;

+	wrlp(mp, INT_MASK_EXT, 0x00000000);
 	wrlp(mp, INT_MASK, 0x00000000);
 	rdlp(mp, INT_MASK);

-- 
1.5.6.4
--
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