linux-kernel - Re: [PATCH -next] gpu: host1x: simplify the return expression of host1x_cdma

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Date:   Mon, 21 Sep 2020 15:27:24 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Mikko Perttunen <cyndis@...si.fi>
Cc:     Qinglang Miao <miaoqinglang@...wei.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] gpu: host1x: simplify the return expression of
 host1x_cdma_init()

On Mon, Sep 21, 2020 at 04:12:20PM +0300, Mikko Perttunen wrote:
> On 9/21/20 4:10 PM, Qinglang Miao wrote:
> > Simplify the return expression.
> > 
> > Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
> > ---
> >   drivers/gpu/host1x/cdma.c | 8 +-------
> >   1 file changed, 1 insertion(+), 7 deletions(-)
> > 
> > diff --git a/drivers/gpu/host1x/cdma.c b/drivers/gpu/host1x/cdma.c
> > index e8d3fda91..08a0f9e10 100644
> > --- a/drivers/gpu/host1x/cdma.c
> > +++ b/drivers/gpu/host1x/cdma.c
> > @@ -448,8 +448,6 @@ void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
> >    */
> >   int host1x_cdma_init(struct host1x_cdma *cdma)
> >   {
> > -	int err;
> > -
> >   	mutex_init(&cdma->lock);
> >   	init_completion(&cdma->complete);
> > @@ -459,11 +457,7 @@ int host1x_cdma_init(struct host1x_cdma *cdma)
> >   	cdma->running = false;
> >   	cdma->torndown = false;
> > -	err = host1x_pushbuffer_init(&cdma->push_buffer);
> > -	if (err)
> > -		return err;
> > -
> > -	return 0;
> > +	return host1x_pushbuffer_init(&cdma->push_buffer);
> 
> IMHO, this makes it less readable since now it kind of looks like
> host1x_pushbuffer_init is returning some meaningful value, instead of the
> code just handling error values in a sequence.

Agreed. Collapsing the error handling like this also makes adding code
to the bottom of this function more complicated than necessary.

Thierry

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