From: Pavel Andrianov Date: Tue, 2 Aug 2016 09:41:53 +0000 (+0300) Subject: wl3501_cs: Add spinlock to wl3501_reset X-Git-Tag: v5.15~12760^2~176^2~64 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bd6b0242652a8a284eed2adec5ac1fc043b8f2ef;p=platform%2Fkernel%2Flinux-starfive.git 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 Acked-by: Vaishali Thakkar Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/wl3501_cs.c b/drivers/net/wireless/wl3501_cs.c index 82d94f8..932f3f81 100644 --- a/drivers/net/wireless/wl3501_cs.c +++ b/drivers/net/wireless/wl3501_cs.c @@ -1258,7 +1258,9 @@ 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)) { @@ -1280,20 +1282,17 @@ 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);