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03a9606e7f
drm_fb_helper_is_bound() is used to check if DRM userspace is in control.
This is done by looking at the fb on the primary plane. By the time
fb-helper gets around to committing, it's possible that the facts have
changed.
Avoid this race by holding the drm_device->master_mutex lock while
committing. When DRM userspace does its first open, it will now wait
until fb-helper is done. The helper will stay away if there's a master.
Two igt tests fail with the new 'bail out if master' rule. Work around
this by relaxing this rule for drm_fb_helper_restore_fbdev_mode_unlocked()
until the tests have been fixed. Add todo entry for this.
Locking rule: Always take the fb-helper lock first.
v5: drm_fb_helper_restore_fbdev_mode_unlocked(): Use
restore_fbdev_mode_force()
v2:
- Remove drm_fb_helper_is_bound() (Daniel Vetter)
- No need to check fb_helper->dev->master in
drm_fb_helper_single_fb_probe(), restore_fbdev_mode() has the check.
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190506180139.6913-3-noralf@tronnes.org
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| .. | ||
| bridge | ||
| dp-mst | ||
| afbc.rst | ||
| amdgpu-dc.rst | ||
| amdgpu.rst | ||
| conf.py | ||
| drivers.rst | ||
| drm-client.rst | ||
| drm-internals.rst | ||
| drm-kms-helpers.rst | ||
| drm-kms.rst | ||
| drm-mm.rst | ||
| drm-uapi.rst | ||
| i915.rst | ||
| index.rst | ||
| introduction.rst | ||
| kms-properties.csv | ||
| komeda-kms.rst | ||
| meson.rst | ||
| msm-crash-dump.rst | ||
| pl111.rst | ||
| tegra.rst | ||
| tinydrm.rst | ||
| todo.rst | ||
| tve200.rst | ||
| v3d.rst | ||
| vc4.rst | ||
| vga-switcheroo.rst | ||
| vgaarbiter.rst | ||
| vkms.rst | ||
| xen-front.rst | ||