drm: Suppress user controlled spam for invalid drm_wait_vblank_ioctl
authorChris Wilson <chris@chris-wilson.co.uk>
Tue, 4 Sep 2018 11:57:19 +0000 (12:57 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Tue, 4 Sep 2018 17:59:56 +0000 (18:59 +0100)
commita9734d8ee63346865d5966551ef4aabf8016d8dd
tree4419d72449aeeb1a7b57ffe49917c533cef6a918
parentb9a40816fef79a6053b9d601f50e852acdaafebd
drm: Suppress user controlled spam for invalid drm_wait_vblank_ioctl

The ioctl arguments are under control of the user and as such we should
resist any temptation to flood the kernel logs with their errors.
Relegate the DRM_ERROR to a DRM_DEBUG so the user has to opt into
hearing of their own mistakes. (One day we will have a small ringbuffer
attached to the task, so that the concerned process can inspect its own
debug info for EINVAL without them being hitting syslog at all.)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180904115719.24525-1-chris@chris-wilson.co.uk
drivers/gpu/drm/drm_vblank.c