On Mon, 2018-05-07 at 11:36 +0200, Maarten Lankhorst wrote:
> Op 04-05-18 om 16:25 schreef Ezequiel Garcia:
> > It's perfectly possible to get dumb buffers out of drivers
> > that don't support modeset. This is the case of vgem,
> > which can be used to export dmabuf to run various tests.
> > Therefore, move the dumb buffer capability check before
> > the mode set check.
> >
> > Inspired by commit f3f4c4d68a28 ("drm: Allow CAP_PRIME on !MODESET").
> >
> > Fixes: d5264ed3823a ("drm: Return -ENOTSUPP when called for KMS cap with a non-KMS driver")
> > Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/drm_ioctl.c | 7 +++----
> > 1 file changed, 3 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> > index af782911c505..deac011a0c25 100644
> > --- a/drivers/gpu/drm/drm_ioctl.c
> > +++ b/drivers/gpu/drm/drm_ioctl.c
> > @@ -244,6 +244,9 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
> > case DRM_CAP_SYNCOBJ:
> > req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ);
> > return 0;
> > + case DRM_CAP_DUMB_BUFFER:
> > + req->value |= dev->driver->dumb_create ? 1 : 0;
>
> Why the |= ?
I'd say that's a silly copy-paste glitch. Will send a v2.
> > + return 0;
> > }
> >
> > /* Other caps only work with KMS drivers */
> > @@ -251,10 +254,6 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
> > return -ENOTSUPP;
> >
> > switch (req->capability) {
> > - case DRM_CAP_DUMB_BUFFER:
> > - if (dev->driver->dumb_create)
> > - req->value = 1;
> > - break;
> > case DRM_CAP_VBLANK_HIGH_CRTC:
> > req->value = 1;
> > break;
>
>
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