linux-kernel - Re: [PATCH] staging: comedi: comedi_fops.c: changed type in assignment to unsigned int *

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Date:   Wed, 15 Jul 2020 04:30:30 -0400
From:   B K Karthik <bkkarthik@...u.pes.edu>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Xiyu Yang <xiyuyang19@...an.edu.cn>,
        Michel Lespinasse <walken@...gle.com>,
        Divyansh Kamboj <kambojdivyansh2000@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: comedi: comedi_fops.c: changed type in
 assignment to unsigned int *

On Wed, Jul 15, 2020 at 3:08 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Jul 15, 2020 at 12:48:13AM -0400, B K Karthik wrote:
> > fixed a sparse warning by changing the type in
> > assignment from void [noderef] __user * to unsigned int *
> > (different address space)
> >
> > Signed-off-by: B K Karthik <karthik.bk2000@...e.com>
> > ---
> >  drivers/staging/comedi/comedi_fops.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
> > index 3f70e5dfac39..4cc012e231b7 100644
> > --- a/drivers/staging/comedi/comedi_fops.c
> > +++ b/drivers/staging/comedi/comedi_fops.c
> > @@ -2956,7 +2956,7 @@ static int get_compat_cmd(struct comedi_cmd *cmd,
> >       cmd->scan_end_arg = v32.scan_end_arg;
> >       cmd->stop_src = v32.stop_src;
> >       cmd->stop_arg = v32.stop_arg;
> > -     cmd->chanlist = compat_ptr(v32.chanlist);
> > +     cmd->chanlist = (unsigned int *) compat_ptr(v32.chanlist);
> >       cmd->chanlist_len = v32.chanlist_len;
> >       cmd->data = compat_ptr(v32.data);
> >       cmd->data_len = v32.data_len;
>
> Always run your patches through checkpatch before sending them, so you
> do not have a grumpy maintainer telling you that you have to run
> checkpatch on your patch before sending them.

I will, Sorry for that.

But this particular error which showed up after running checkpatch is
something 'git format-patch' does unintentionally.
It has been reported to the maintainers.

thanks,

karthik