linux-kernel - Re: [PATCH] watchdog: bcm281xx: Fix use of uninitialized spinlock.

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Date:   Thu, 27 Apr 2017 19:27:12 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Wim Van Sebroeck <wim@...ana.be>,
        linux-watchdog@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>
Subject: Re: [PATCH] watchdog: bcm281xx: Fix use of uninitialized spinlock.

On 04/27/2017 06:02 PM, Eric Anholt wrote:
> The bcm_kona_wdt_set_resolution_reg() call takes the spinlock, so
> initialize it earlier.  Fixes a warning at boot with lock debugging
> enabled.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/bcm_kona_wdt.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/bcm_kona_wdt.c b/drivers/watchdog/bcm_kona_wdt.c
> index 6fce17d5b9f1..a5775dfd8d5f 100644
> --- a/drivers/watchdog/bcm_kona_wdt.c
> +++ b/drivers/watchdog/bcm_kona_wdt.c
> @@ -304,6 +304,8 @@ static int bcm_kona_wdt_probe(struct platform_device *pdev)
>  	if (!wdt)
>  		return -ENOMEM;
>
> +	spin_lock_init(&wdt->lock);
> +
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	wdt->base = devm_ioremap_resource(dev, res);
>  	if (IS_ERR(wdt->base))
> @@ -316,7 +318,6 @@ static int bcm_kona_wdt_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>
> -	spin_lock_init(&wdt->lock);
>  	platform_set_drvdata(pdev, wdt);
>  	watchdog_set_drvdata(&bcm_kona_wdt_wdd, wdt);
>  	bcm_kona_wdt_wdd.parent = &pdev->dev;
>