linux-kernel - Re: [PATCH 6/8] media: solo6x10: use 'time_left' variable with wait_for_completion

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Date: Mon, 3 Jun 2024 18:28:32 +0200
From: Ismael Luceno <ismael@...ev.co.uk>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: linux-kernel@...r.kernel.org,
	Bluecherry Maintainers <maintainers@...echerrydvr.com>,
	Anton Sviridenko <anton@...p.bluecherry.net>,
	Andrey Utkin <andrey_utkin@...tmail.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 6/8] media: solo6x10: use 'time_left' variable with
 wait_for_completion_timeout()

On 03/Jun/2024 18:25, Ismael Luceno wrote:
> On 03/Jun/2024 11:28, Wolfram Sang wrote:
> > There is a confusing pattern in the kernel to use a variable named 'timeout' to
> > store the result of wait_for_completion_timeout() causing patterns like:
> > 
> > 	timeout = wait_for_completion_timeout(...)
> > 	if (!timeout) return -ETIMEDOUT;
> > 
> > with all kinds of permutations. Use 'time_left' as a variable to make the code
> > self explaining.
> > 
> > Fix to the proper variable type 'unsigned long' while here.
> > 
> > Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> > ---
> >  drivers/media/pci/solo6x10/solo6x10-p2m.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/media/pci/solo6x10/solo6x10-p2m.c b/drivers/media/pci/solo6x10/solo6x10-p2m.c
> > index ca70a864a3ef..5f100e5e03d9 100644
> > --- a/drivers/media/pci/solo6x10/solo6x10-p2m.c
> > +++ b/drivers/media/pci/solo6x10/solo6x10-p2m.c
> > @@ -57,7 +57,7 @@ int solo_p2m_dma_desc(struct solo_dev *solo_dev,
> >  		      int desc_cnt)
> >  {
> >  	struct solo_p2m_dev *p2m_dev;
> > -	unsigned int timeout;
> > +	unsigned long time_left;
> >  	unsigned int config = 0;
> >  	int ret = 0;
> >  	unsigned int p2m_id = 0;
> > @@ -99,12 +99,12 @@ int solo_p2m_dma_desc(struct solo_dev *solo_dev,
> >  			       desc[1].ctrl);
> >  	}
> >  
> > -	timeout = wait_for_completion_timeout(&p2m_dev->completion,
> > -					      solo_dev->p2m_jiffies);
> > +	time_left = wait_for_completion_timeout(&p2m_dev->completion,
> > +						solo_dev->p2m_jiffies);
> >  
> >  	if (WARN_ON_ONCE(p2m_dev->error))
> >  		ret = -EIO;
> > -	else if (timeout == 0) {
> > +	else if (time_left == 0) {
> >  		solo_dev->p2m_timeouts++;
> >  		ret = -EAGAIN;
> >  	}
> 
> Signed-off-by: Ismael Luceno <ismael@...ev.co.uk>

Sorry, I meant Acked-by.