linux-kernel - Re: [Outreachy kernel] [PATCH] Staging: media: omap4iss: Use WARN_ON() instead of BUG

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Message-ID: <alpine.DEB.2.20.1709081609440.3165@hadrien>
Date:   Fri, 8 Sep 2017 16:10:09 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Srishti Sharma <srishtishar@...il.com>
cc:     gregkh@...uxfoundation.org, laurent.pinchart@...asonboard.com,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] Staging: media: omap4iss: Use WARN_ON()
 instead of BUG_ON().



On Fri, 8 Sep 2017, Srishti Sharma wrote:

> Use WARN_ON() instead of BUG_ON() to avoid crashing the kernel.
>
> Signed-off-by: Srishti Sharma <srishtishar@...il.com>
> ---
>  drivers/staging/media/omap4iss/iss.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/omap4iss/iss.c b/drivers/staging/media/omap4iss/iss.c
> index c26c99fd..b1036ba 100644
> --- a/drivers/staging/media/omap4iss/iss.c
> +++ b/drivers/staging/media/omap4iss/iss.c
> @@ -893,7 +893,7 @@ void omap4iss_put(struct iss_device *iss)
>  		return;
>
>  	mutex_lock(&iss->iss_mutex);
> -	BUG_ON(iss->ref_count == 0);
> +	WARN_ON(iss->ref_count == 0);
>  	if (--iss->ref_count == 0) {

Won't this then infinite loop?

julia

>  		iss_disable_interrupts(iss);
>  		/* Reset the ISS if an entity has failed to stop. This is the
> --
> 2.7.4
>
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