linux-kernel - Re: [PATCH] Staging: comedi: drivers: comedi

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Date:   Mon, 20 Feb 2017 10:03:39 +0000
From:   Ian Abbott <abbotti@....co.uk>
To:     Cheah Kok Cheong <thrust73@...il.com>,
        hsweeten@...ionengravers.com, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: comedi: drivers: comedi_test: Avoid multiple
 line dereference

On 20/02/17 08:28, Cheah Kok Cheong wrote:
> Fix checkpatch warning "Avoid multiple line dereference"
> using a local variable to avoid line wrap.
>
> Signed-off-by: Cheah Kok Cheong <thrust73@...il.com>
> ---
>  drivers/staging/comedi/drivers/comedi_test.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/comedi_test.c b/drivers/staging/comedi/drivers/comedi_test.c
> index 2a063f0..fde83e0 100644
> --- a/drivers/staging/comedi/drivers/comedi_test.c
> +++ b/drivers/staging/comedi/drivers/comedi_test.c
> @@ -480,11 +480,9 @@ static void waveform_ao_timer(unsigned long arg)
>  			/* output the last scan */
>  			for (i = 0; i < cmd->scan_end_arg; i++) {
>  				unsigned int chan = CR_CHAN(cmd->chanlist[i]);
> +				unsigned short d = devpriv->ao_loopbacks[chan];
>
> -				if (comedi_buf_read_samples(s,
> -							    &devpriv->
> -							     ao_loopbacks[chan],
> -							    1) == 0) {
> +				if (!comedi_buf_read_samples(s, &d, 1)) {
>  					/* unexpected underrun! (cancelled?) */
>  					async->events |= COMEDI_CB_OVERFLOW;
>  					goto underrun;
>

NAK.  This leaves devpriv->ao_loopbacks[chan] unchanged.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-