lkml.org 
[lkml]   [2020]   [Apr]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] Staging: comedi: dt2815: remove set but not used variable 'hi'
From
Date
On 07/04/2020 13:59, Wang Hai wrote:
> Fixes gcc '-Wunused-but-set-variable' warning:
>
> drivers/staging/comedi/drivers/dt2815.c: In function dt2815_ao_insn:
> drivers/staging/comedi/drivers/dt2815.c:91:19: warning: variable 'hi' set but not used [-Wunused-but-set-variable]
>
> commit d6a929b7608a ("Staging: comedi: add dt2815 driver")
> involved this, remove it.
>
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Wang Hai <wanghai38@huawei.com>
> ---
> drivers/staging/comedi/drivers/dt2815.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/dt2815.c b/drivers/staging/comedi/drivers/dt2815.c
> index 83026ba..bcf85ec 100644
> --- a/drivers/staging/comedi/drivers/dt2815.c
> +++ b/drivers/staging/comedi/drivers/dt2815.c
> @@ -88,12 +88,11 @@ static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
> struct dt2815_private *devpriv = dev->private;
> int i;
> int chan = CR_CHAN(insn->chanspec);
> - unsigned int lo, hi;
> + unsigned int lo;
> int ret;
>
> for (i = 0; i < insn->n; i++) {
> lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
> - hi = (data[i] & 0xff0) >> 4;
>
> ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x00);
> if (ret)
>

That 'hi' value should be written to the hardware, but the driver is
broken. I don't think this driver has ever been tested as working
because it has never written the 'hi' value to the hardware!

I think I know how to fix it. I'll send a patch.

--
-=( Ian Abbott <abbotti@mev.co.uk> || Web: www.mev.co.uk )=-
-=( MEV Ltd. is a company registered in England & Wales. )=-
-=( Registered number: 02862268. Registered address: )=-
-=( 15 West Park Road, Bramhall, STOCKPORT, SK7 3JZ, UK. )=-

\
 
 \ /
  Last update: 2020-04-06 15:52    [W:0.078 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site