Re: [PATCH 2/5] drm/vblank: Stop drm_crtc_wait_one_vblank() when vblank is turned off

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- [High] drm/vblank: missing Signed-off-by trailer in commit message
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commit 7617b69ad08b75966bdfac2d98682c551d654593
Author: Prike Liang <Prike.Liang@amd.com>

> drm/vblank: Stop drm_crtc_wait_one_vblank() when vblank is turned off
>
> drm_crtc_vblank_off() turns off the vblank interrupt even while someone
> holds a vblank reference and waits for a vblank. It then wakes up the
> vblank wait queue. DRM_IOCTL_WAIT_VBLANK stops waiting at this point,
> because its wait condition also checks whether vblank is still enabled.
>
> drm_crtc_wait_one_vblank() and drm_crtc_wait_one_vblank_interruptible()
> only check whether the vblank count has changed. Once vblank is off, the
> count doesn't change, so the woken waiter sleeps again until the wait
> times out after one second and warns "vblank wait timed out". This
> happens, for example, when the fbdev damage worker or FBIO_WAITFORVSYNC
> waits for a vblank while the driver turns the CRTC off for suspend or a
> GPU reset.
>
> Make __drm_crtc_wait_one_vblank(), which implements both functions, also
> stop waiting when vblank is turned off, and return -EINVAL if no vblank
> passed, the same error that drm_vblank_get() returns when vblank is off.
> The wait condition is checked before going to sleep, so this also covers
> vblank being turned off between drm_vblank_get() and the wait. Waits
> that see a vblank, time out or are interrupted behave as before.
>
> Fixes: e8450f51a4b3 ("drm/irq: Implement a generic vblank_wait function")
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Assisted-by: Copilot:claude-opus-5.5

[Severity: High]
This commit message is missing a Signed-off-by: trailer from the patch
author.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261111083534.514290-1-Prike.Liang@amd.com?part=2