netdev - [PATCH net-next v1 11/21] amd-xgbe: Guard against incorrectly generated interrupts

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

Message-ID: <20161103132936.3437.85364.stgit@tlendack-t1.amdoffice.net>
Date:   Thu, 3 Nov 2016 08:29:36 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     <netdev@...r.kernel.org>
CC:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>
Subject: [PATCH net-next v1 11/21] amd-xgbe: Guard against incorrectly
 generated interrupts

Due to a hardware issue, it is possible for interrupt events to be
incorrectly generated when performing a soft reset.  To guard against
this, perform the soft reset twice.

Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
 drivers/net/ethernet/amd/xgbe/xgbe-dev.c |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
index 9d86112..698712b 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
@@ -1897,7 +1897,7 @@ static int xgbe_disable_int(struct xgbe_channel *channel,
 	return 0;
 }
 
-static int xgbe_exit(struct xgbe_prv_data *pdata)
+static int __xgbe_exit(struct xgbe_prv_data *pdata)
 {
 	unsigned int count = 2000;
 
@@ -1919,6 +1919,20 @@ static int xgbe_exit(struct xgbe_prv_data *pdata)
 	return 0;
 }
 
+static int xgbe_exit(struct xgbe_prv_data *pdata)
+{
+	int ret;
+
+	/* To guard against possible incorrectly generated interrupts,
+	 * issue the software reset twice.
+	 */
+	ret = __xgbe_exit(pdata);
+	if (ret)
+		return ret;
+
+	return __xgbe_exit(pdata);
+}
+
 static int xgbe_flush_tx_queues(struct xgbe_prv_data *pdata)
 {
 	unsigned int i, count;