tree c460a5e7e5e1e424121c186d3484b73b4950228b
parent d243ad820295d1c499f9256f8ef04d1d36e74e34
author Chris Wilson <chris@chris-wilson.co.uk> 1471537005 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1471556203 +0100

drm/i915: Fallback to single page pwrite/pread if unable to release fence

If we cannot release the fence (for example if someone is inexplicably
trying to write into a tiled framebuffer that is currently pinned to the
display! *cough* kms_frontbuffer_tracking *cough*) fallback to using the
page-by-page pwrite/pread interface, rather than fail the syscall
entirely.

Since this is triggerable by the user (along pwrite) we have to remove
the WARN_ON(fence->pin_count).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-6-chris@chris-wilson.co.uk