[PATCH 1/2] drm: Fix vblank refcount during modeset

[Li, Yunxiang (Teddy)]

[AMD Official Use Only - General]

I found out that elsewhere in the drm code (e.g. in drm_atomic_helper.c) expects drm_vblank_get() to fail as part of normal operation. So this patch doesn't seem appropriate anymore and it seems more appropriate to hunt down all the unchecked calls for drm_vblank_get and fix them instead. I don't know how to best make sure this doesn't reoccur in the future though.

Regards,
Yunxiang

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