From ba3dbf01f99ceada96c294035547c050d204868c Mon Sep 17 00:00:00 2001
From: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Date: Wed, 4 Jul 2018 11:14:50 +0300
Subject: [PATCH 1/6] ravb: fix invalid context bug while calling
auto-negotiation by ethtool
Git-commit: 0973a4dd79fe56a3beecfcff675ba4c01df0b0c1
Patch-mainline: v4.18-rc6
References: git-fixes
Since commit 35b5f6b1a82b ("PHYLIB: Locking fixes for PHY I/O
potentially sleeping") phy_start_aneg() function utilizes a mutex
to serialize changes to phy state, however the helper function is
called in atomic context.
The bug can be reproduced by running "ethtool -r" command, the bug
is reported if CONFIG_DEBUG_ATOMIC_SLEEP build option is enabled.
Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ethernet/renesas/ravb_main.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index f4ff5a7ef9db..953213689ac3 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1131,15 +1131,10 @@ static int ravb_set_link_ksettings(struct net_device *ndev,
static int ravb_nway_reset(struct net_device *ndev)
{
- struct ravb_private *priv = netdev_priv(ndev);
int error = -ENODEV;
- unsigned long flags;
- if (ndev->phydev) {
- spin_lock_irqsave(&priv->lock, flags);
+ if (ndev->phydev)
error = phy_start_aneg(ndev->phydev);
- spin_unlock_irqrestore(&priv->lock, flags);
- }
return error;
}
--
2.16.4