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drm: Roll out acquire context for the page_flip ioctl 

Again just prep work.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-11-daniel.vetter@ffwll.ch
hifive-unleashed-5.1
Daniel Vetter 2017-03-22 22:50:49 +01:00
parent d26f96c74d
commit 29dc0d1de1
1 changed files with 19 additions and 2 deletions
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21
drivers/gpu/drm/drm_plane.c
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@ -803,6 +803,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
struct drm_framebuffer *fb = NULL;
struct drm_pending_vblank_event *e = NULL;
u32 target_vblank = page_flip->sequence;
struct drm_modeset_acquire_ctx ctx;
int ret = -EINVAL;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
@ -866,7 +867,16 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
return -EINVAL;
}
drm_modeset_lock_crtc(crtc, crtc->primary);
drm_modeset_acquire_init(&ctx, 0);
retry:
ret = drm_modeset_lock(&crtc->mutex, &ctx);
if (ret)
goto out;
ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);
if (ret)
goto out;
crtc->acquire_ctx = &ctx;
if (crtc->primary->fb == NULL) {
/* The framebuffer is currently unbound, presumably
* due to a hotplug event, that userspace has not
@ -944,7 +954,14 @@ out:
if (crtc->primary->old_fb)
drm_framebuffer_put(crtc->primary->old_fb);
crtc->primary->old_fb = NULL;
drm_modeset_unlock_crtc(crtc);
if (ret == -EDEADLK) {
drm_modeset_backoff(&ctx);
goto retry;
}
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;
}