On Wed, Nov 30, 2016 at 05:30:02PM +0900, Michel Dänzer wrote:
> From: Michel Dänzer <michel.daenzer@xxxxxxx>
>
> This is an attempt to make the previous fix a bit more robust going
> forward.
>
> Signed-off-by: Michel Dänzer <michel.daenzer@xxxxxxx>
> ---
> drivers/gpu/drm/drm_ioctl.c | 23 +++++++++++++++++------
> 1 file changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index 71c3473..32f484b 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -229,6 +229,19 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
> struct drm_crtc *crtc;
>
> req->value = 0;
> +
> + /* Only allow non-KMS caps with non-KMS drivers */
> + switch (req->capability) {
> + case DRM_CAP_DUMB_BUFFER:
Dumb buffers are only meant to be used for kms drivers, should be
disallowed too.
> + case DRM_CAP_VBLANK_HIGH_CRTC:
Might be good to have a comment here that we need to allow this for old
ums?
> + case DRM_CAP_PRIME:
> + case DRM_CAP_TIMESTAMP_MONOTONIC:
This is pretty new, I don't think any of the old ums drivers was ever
updated to use it. Should probably disallow it too.
> + break;
> + default:
> + if (!drm_core_check_feature(dev, DRIVER_MODESET))
> + return -ENOTSUPP;
> + }
And one code org bikeshed: I don't like the duplicated switch, could we
instead split it it into two disjoint sets like this?
switch (req->capability) {
case DRM_CAP_PRIME:
req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
break;
... all other non-modeset caps ...
}
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -ENOTSUPP;
switch (req->capability) {
... handle remaining caps needed for DRIVER_MODSET ...
default:
return -EINVAL;
}
That way it would be a bit more obvious that people who add a new cap need
to make a decision where to put it (and by default put it in the bottom
pile).
-Daniel
> switch (req->capability) {
> case DRM_CAP_DUMB_BUFFER:
> if (dev->driver->dumb_create)
> @@ -254,12 +267,10 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
> req->value = dev->mode_config.async_page_flip;
> break;
> case DRM_CAP_PAGE_FLIP_TARGET:
> - if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> - req->value = 1;
> - drm_for_each_crtc(crtc, dev) {
> - if (!crtc->funcs->page_flip_target)
> - req->value = 0;
> - }
> + req->value = 1;
> + drm_for_each_crtc(crtc, dev) {
> + if (!crtc->funcs->page_flip_target)
> + req->value = 0;
> }
> break;
> case DRM_CAP_CURSOR_WIDTH:
> --
> 2.10.2
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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