linux-kernel - Re: [PATCH] stm32-dcmi: constify vb2

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Date:   Sun, 16 Jul 2017 23:01:16 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Hugues FRUCHET <hugues.fruchet@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>
Cc:     "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] stm32-dcmi: constify vb2_ops structure


On 07/07/2017 09:33 AM, Hugues FRUCHET wrote:
> Acked-by: Hugues Fruchet <hugues.fruchet@...com>

Thank you, Hugues.

> On 07/06/2017 10:05 PM, Gustavo A. R. Silva wrote:
>> Check for vb2_ops structures that are only stored in the ops field of a
>> vb2_queue structure. That field is declared const, so vb2_ops structures
>> that have this property can be declared as const also.
>>
>> This issue was detected using Coccinelle and the following semantic patch:
>>
>> @r disable optional_qualifier@
>> identifier i;
>> position p;
>> @@
>> static struct vb2_ops i@p = { ... };
>>
>> @ok@
>> identifier r.i;
>> struct vb2_queue e;
>> position p;
>> @@
>> e.ops = &i@p;
>>
>> @bad@
>> position p != {r.p,ok.p};
>> identifier r.i;
>> struct vb2_ops e;
>> @@
>> e@i@p
>>
>> @depends on !bad disable optional_qualifier@
>> identifier r.i;
>> @@
>> static
>> +const
>> struct vb2_ops i = { ... };
>>
>> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>> ---
>>    drivers/media/platform/stm32/stm32-dcmi.c | 2 +-
>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
>> index 83d32a5..24ef888 100644
>> --- a/drivers/media/platform/stm32/stm32-dcmi.c
>> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
>> @@ -662,7 +662,7 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
>>    		dcmi->errors_count, dcmi->buffers_count);
>>    }
>>    
>> -static struct vb2_ops dcmi_video_qops = {
>> +static const struct vb2_ops dcmi_video_qops = {
>>    	.queue_setup		= dcmi_queue_setup,
>>    	.buf_init		= dcmi_buf_init,
>>    	.buf_prepare		= dcmi_buf_prepare,

-- 
Gustavo A. R. Silva