linux-kernel - [PATCH] wl3501_cs: Add spinlock to wl3501

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Date:	Tue,  2 Aug 2016 12:41:53 +0300
From:	Pavel Andrianov <andrianov@...ras.ru>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Pavel Andrianov <andrianov@...ras.ru>,
	Kalle Valo <kvalo@...eaurora.org>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org,
	vaishali.thakkar@...cle.com
Subject: [PATCH] wl3501_cs: Add spinlock to wl3501_reset

Likely wl3501_reset should acquire spinlock as wl3501_{open, close}.
One of calls of wl3501_reset has been already protected.
The others were unprotected and might lead to a race condition.
The patch adds spinlock into the wl3501_reset and removes it from 
wl3501_tx_timeout.

Found by Linux Driver Verification project (linuxtesting.org)

Signed-off-by: Pavel Andrianov <andrianov@...ras.ru>
---
 drivers/net/wireless/wl3501_cs.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/wl3501_cs.c b/drivers/net/wireless/wl3501_cs.c
index 13fd734..196f13c 100644
--- a/drivers/net/wireless/wl3501_cs.c
+++ b/drivers/net/wireless/wl3501_cs.c
@@ -1247,7 +1247,9 @@ static int wl3501_reset(struct net_device *dev)
 {
 	struct wl3501_card *this = netdev_priv(dev);
 	int rc = -ENODEV;
+	unsigned long flags;
 
+	spin_lock_irqsave(&this->lock, flags);
 	wl3501_block_interrupt(this);
 
 	if (wl3501_init_firmware(this)) {
@@ -1269,20 +1271,17 @@ static int wl3501_reset(struct net_device *dev)
 	pr_debug("%s: device reset", dev->name);
 	rc = 0;
 out:
+	spin_unlock_irqrestore(&this->lock, flags);
 	return rc;
 }
 
 static void wl3501_tx_timeout(struct net_device *dev)
 {
-	struct wl3501_card *this = netdev_priv(dev);
 	struct net_device_stats *stats = &dev->stats;
-	unsigned long flags;
 	int rc;
 
 	stats->tx_errors++;
-	spin_lock_irqsave(&this->lock, flags);
 	rc = wl3501_reset(dev);
-	spin_unlock_irqrestore(&this->lock, flags);
 	if (rc)
 		printk(KERN_ERR "%s: Error %d resetting card on Tx timeout!\n",
 		       dev->name, rc);
-- 
2.7.4