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

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Message-ID: <CAB3L5oyyQFa5Z-eWzpbe6QCNF=U4W2mnkwgt3-uE46nEuPWpEg@mail.gmail.com>
Date:   Fri, 8 Sep 2017 19:47:02 +0530
From:   Srishti Sharma <srishtishar@...il.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        laurent.pinchart@...asonboard.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        Linux kernel mailing list <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, Sep 8, 2017 at 7:40 PM, Julia Lawall <julia.lawall@...6.fr> wrote:
>
>
> 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?

 Oh.. yes ! It would, sorry . Please drop this patch .

 Regards,
 Srishti

>
> 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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