netdev - [PATCH net] 8139too:fix system hang when there is a tx timeout event.

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: <1469644797-13334-1-git-send-email-hau@realtek.com>
Date:	Thu, 28 Jul 2016 02:39:57 +0800
From:	Chunhao Lin <hau@...ltek.com>
To:	<netdev@...r.kernel.org>
CC:	<nic_swsd@...ltek.com>, <linux-kernel@...r.kernel.org>,
	Chunhao Lin <hau@...ltek.com>
Subject: [PATCH net] 8139too:fix system hang when there is a tx timeout event.

If tx timeout event occur, kernel will call rtl8139_tx_timeout_task() to reset
hardware. But in this function, driver does not stop tx and rx function before
reset hardware, that will cause system hang.

In this patch, add stop tx and rx function before reset hardware.

Signed-off-by: Chunhao Lin <hau@...ltek.com>
---
 drivers/net/ethernet/realtek/8139too.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c
index ef668d3..0d77f3c 100644
--- a/drivers/net/ethernet/realtek/8139too.c
+++ b/drivers/net/ethernet/realtek/8139too.c
@@ -1667,6 +1667,10 @@ static void rtl8139_tx_timeout_task (struct work_struct *work)
 	int i;
 	u8 tmp8;
 
+	napi_disable(&tp->napi);
+	netif_stop_queue(dev);
+	synchronize_sched();
+
 	netdev_dbg(dev, "Transmit timeout, status %02x %04x %04x media %02x\n",
 		   RTL_R8(ChipCmd), RTL_R16(IntrStatus),
 		   RTL_R16(IntrMask), RTL_R8(MediaStatus));
@@ -1696,10 +1700,10 @@ static void rtl8139_tx_timeout_task (struct work_struct *work)
 	spin_unlock_irq(&tp->lock);
 
 	/* ...and finally, reset everything */
-	if (netif_running(dev)) {
-		rtl8139_hw_start (dev);
-		netif_wake_queue (dev);
-	}
+	napi_enable(&tp->napi);
+	rtl8139_hw_start (dev);
+	netif_wake_queue (dev);
+
 	spin_unlock_bh(&tp->rx_lock);
 }
 
-- 
1.9.1