netdev - [PATCH net v3 6/7] eth: via-rhine: fix calling napi

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Message-ID: <20250124031841.1179756-7-kuba@kernel.org>
Date: Thu, 23 Jan 2025 19:18:40 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	dan.carpenter@...aro.org,
	Jakub Kicinski <kuba@...nel.org>,
	kevinbrace@...cecomputerlab.com,
	romieu@...zoreil.com,
	kuniyu@...zon.com
Subject: [PATCH net v3 6/7] eth: via-rhine: fix calling napi_enable() in atomic context

napi_enable() may sleep now, take netdev_lock() before rp->lock.
napi_enable() is hidden inside init_registers().

Note that this patch orders netdev_lock after rp->task_lock,
to avoid having to take the netdev_lock() around disable path.

Fixes: 413f0271f396 ("net: protect NAPI enablement with netdev_lock()")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Link: https://lore.kernel.org/dcfd56bc-de32-4b11-9e19-d8bd1543745d@stanley.mountain
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
v2:
 - actually switch to napi_enable_locked()
v1: https://lore.kernel.org/20250121221519.392014-7-kuba@kernel.org

CC: kevinbrace@...cecomputerlab.com
CC: romieu@...zoreil.com
CC: kuniyu@...zon.com
---
 drivers/net/ethernet/via/via-rhine.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c
index 894911f3d560..e56ebbdd428d 100644
--- a/drivers/net/ethernet/via/via-rhine.c
+++ b/drivers/net/ethernet/via/via-rhine.c
@@ -1568,7 +1568,7 @@ static void init_registers(struct net_device *dev)
 	if (rp->quirks & rqMgmt)
 		rhine_init_cam_filter(dev);
 
-	napi_enable(&rp->napi);
+	napi_enable_locked(&rp->napi);
 
 	iowrite16(RHINE_EVENT & 0xffff, ioaddr + IntrEnable);
 
@@ -1696,7 +1696,10 @@ static int rhine_open(struct net_device *dev)
 	rhine_power_init(dev);
 	rhine_chip_reset(dev);
 	rhine_task_enable(rp);
+
+	netdev_lock(dev);
 	init_registers(dev);
+	netdev_unlock(dev);
 
 	netif_dbg(rp, ifup, dev, "%s() Done - status %04x MII status: %04x\n",
 		  __func__, ioread16(ioaddr + ChipCmd),
@@ -1727,6 +1730,8 @@ static void rhine_reset_task(struct work_struct *work)
 
 	napi_disable(&rp->napi);
 	netif_tx_disable(dev);
+
+	netdev_lock(dev);
 	spin_lock_bh(&rp->lock);
 
 	/* clear all descriptors */
@@ -1740,6 +1745,7 @@ static void rhine_reset_task(struct work_struct *work)
 	init_registers(dev);
 
 	spin_unlock_bh(&rp->lock);
+	netdev_unlock(dev);
 
 	netif_trans_update(dev); /* prevent tx timeout */
 	dev->stats.tx_errors++;
@@ -2541,9 +2547,12 @@ static int rhine_resume(struct device *device)
 	alloc_tbufs(dev);
 	rhine_reset_rbufs(rp);
 	rhine_task_enable(rp);
+
+	netdev_lock(dev);
 	spin_lock_bh(&rp->lock);
 	init_registers(dev);
 	spin_unlock_bh(&rp->lock);
+	netdev_unlock(dev);
 
 	netif_device_attach(dev);
 
-- 
2.48.1