Re: [RFC v4 03/12] drm/vblank: Register drmm cleanup action once per drm_vblank_crtc

Daniel Vetter
2020-05-08T20:59:18Z

On Fri, May 8, 2020 at 10:48 PM Lyude Paul <lyude@redhat.com> wrote:
>
> Since we'll be allocating resources for kthread_create_worker() in the
> next commit (which could fail and require us to clean up the mess),
> let's simplify the cleanup process a bit by registering a
> drm_vblank_init_release() action for each drm_vblank_crtc so they're
> still cleaned up if we fail to initialize one of them.
>
> Changes since v3:
> * Use drmm_add_action_or_reset() - Daniel Vetter
>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: nouveau@lists.freedesktop.org
> Signed-off-by: Lyude Paul <lyude@redhat.com>

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

I think the other patches need a brain that's less in w/e mode :-)

Cheers, Daniel

> ---
> drivers/gpu/drm/drm_vblank.c | 23 ++++++++++-------------
> 1 file changed, 10 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index 758bf74e1cab..a4a9013584e2 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -491,16 +491,12 @@ static void vblank_disable_fn(struct timer_list *t)
>
> static void drm_vblank_init_release(struct drm_device *dev, void *ptr)
> {
> - unsigned int pipe;
> -
> - for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
> - struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> + struct drm_vblank_crtc *vblank = ptr;
>
> - WARN_ON(READ_ONCE(vblank->enabled) &&
> - drm_core_check_feature(dev, DRIVER_MODESET));
> + WARN_ON(READ_ONCE(vblank->enabled) &&
> + drm_core_check_feature(dev, DRIVER_MODESET));
>
> - del_timer_sync(&vblank->disable_timer);
> - }
> + del_timer_sync(&vblank->disable_timer);
> }
>
> /**
> @@ -510,7 +506,7 @@ static void drm_vblank_init_release(struct drm_device *dev, void *ptr)
> *
> * This function initializes vblank support for @num_crtcs display pipelines.
> * Cleanup is handled automatically through a cleanup function added with
> - * drmm_add_action().
> + * drmm_add_action_or_reset().
> *
> * Returns:
> * Zero on success or a negative error code on failure.
> @@ -529,10 +525,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
>
> dev->num_crtcs = num_crtcs;
>
> - ret = drmm_add_action(dev, drm_vblank_init_release, NULL);
> - if (ret)
> - return ret;
> -
> for (i = 0; i < num_crtcs; i++) {
> struct drm_vblank_crtc *vblank = &dev->vblank[i];
>
> @@ -541,6 +533,11 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
> init_waitqueue_head(&vblank->queue);
> timer_setup(&vblank->disable_timer, vblank_disable_fn, 0);
> seqlock_init(&vblank->seqlock);
> +
> + ret = drmm_add_action_or_reset(dev, drm_vblank_init_release,
> + vblank);
> + if (ret)
> + return ret;
> }
>
> DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
> --
> 2.25.4
>

--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch