On Sat, Jun 19, 2021 at 3:40 PM Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
>
> On Fri, Jun 18, 2021 at 07:35:24PM +0100, Colin King wrote:
> > From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> >
> > Currently a loop scans through the connector list checking
> > for connectors that do not match a specific criteria. The
> > use of the continue statement is a little unintuitive and
> > can confuse static analysis checking. Invert the criteria
> > matching logic and use a break to terminate the loop once
> > the first suitable connector has been found.
> >
> > Thanks to Patrik Jakobsson for explaining the original
> > intent of the code and suggesting this change.
> >
> > Addresses-Coverity: ("Continue has no effect")
> > Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/gma500/oaktrail_lvds.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/gma500/oaktrail_lvds.c b/drivers/gpu/drm/gma500/oaktrail_lvds.c
> > index 432bdcc57ac9..8541dcf237eb 100644
> > --- a/drivers/gpu/drm/gma500/oaktrail_lvds.c
> > +++ b/drivers/gpu/drm/gma500/oaktrail_lvds.c
> > @@ -113,8 +113,8 @@ static void oaktrail_lvds_mode_set(struct drm_encoder *encoder,
> >
> > /* Find the connector we're trying to set up */
> > list_for_each_entry(connector, &mode_config->connector_list, head) {
> > - if (!connector->encoder || connector->encoder->crtc != crtc)
> > - continue;
> > + if (connector->encoder && connector->encoder->crtc == crtc)
> > + break;
> > }
> >
> > if (!connector) {
>
> This test is wrong/impossible. It should be:
>
> if (list_entry_is_head(connector, &mode_config->connector_list,
> head)) {
Right, we should be back at the head if no match was found. Actually,
when looking closer, we should use drm_for_each_connector_iter() when
walking the connector list together with proper locking.
-Patrik
>
> regards,
> dan carpenter
>
>
