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

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Message-ID: <57A2CC35.60808@oracle.com>
Date:	Thu, 4 Aug 2016 10:31:41 +0530
From:	Vaishali Thakkar <vaishali.thakkar@...cle.com>
To:	Pavel Andrianov <andrianov@...ras.ru>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Kalle Valo <kvalo@...eaurora.org>, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: Re: [PATCH] wl3501_cs: Add spinlock to wl3501_reset



On Tuesday 02 August 2016 03:11 PM, Pavel Andrianov wrote:
> 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>

Acked-by: Vaishali Thakkar <vaishali.thakkar@...cle.com>

> ---
>  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);
> 

-- 
Vaishali