linux-kernel - Re: [PATCH] [media] coda: remove redundant call to v4l2_m2m_get

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Date:   Mon, 27 Mar 2017 13:04:40 +0200
From:   walter harms <wharms@....de>
To:     Philipp Zabel <p.zabel@...gutronix.de>
CC:     Hans Verkuil <hverkuil@...all.nl>,
        Colin King <colin.king@...onical.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [media] coda: remove redundant call to v4l2_m2m_get_vq



Am 27.03.2017 12:10, schrieb Philipp Zabel:
> On Mon, 2017-03-27 at 11:46 +0200, Hans Verkuil wrote:
>> On 23/03/17 12:57, Colin King wrote:
>>> From: Colin Ian King <colin.king@...onical.com>
>>>
>>> The call to v4ls_m2m_get_vq is only used to get the return value
>>> which is not being used, so it appears to be redundant and can
>>> be removed.
>>>
>>> Detected with CoverityScan, CID#1420674 ("Useless call")
>>>
>>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>>> ---
>>>  drivers/media/platform/coda/coda-common.c | 2 --
>>>  1 file changed, 2 deletions(-)
>>>
>>> diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
>>> index 800d2477f1a0..95e4648f18e6 100644
>>> --- a/drivers/media/platform/coda/coda-common.c
>>> +++ b/drivers/media/platform/coda/coda-common.c
>>> @@ -817,8 +817,6 @@ static int coda_qbuf(struct file *file, void *priv,
>>>  static bool coda_buf_is_end_of_stream(struct coda_ctx *ctx,
>>>  				      struct vb2_v4l2_buffer *buf)
>>>  {
>>> -	v4l2_m2m_get_vq(ctx->fh.m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
>>> -
>>>  	return ((ctx->bit_stream_param & CODA_BIT_STREAM_END_FLAG) &&
>>>  		(buf->sequence == (ctx->qsequence - 1)));
>>>  }
>>>
>>
>> Philipp, is this correct, or should this actually check whether the queue is an
>> output queue?
> 
> Yes, this was previously assigned to an unused local variable src_vq,
> since initial commit 918c66fd4126 ("[media] coda: add CODA7541 decoding
> support").
> 
> coda_buf_is_end_of_stream is called from coda_m2m_buf_done, which is
> exclusively used on destination buffers on the capture queue.
> 
> Acked-by: Philipp Zabel <p.zabel@...gutronix.de>
> 
> regards
> Philipp
> 

Is that function needed at all ?

re,
 wh