io-mapping: ensure io_mapping_map_atomic _is_ atomic
For the !HAVE_ATOMIC_IOMAP case the stub functions did not call pagefault_disable/_enable. The i915 driver relies on the map actually being atomic, otherwise it can deadlock with it's own pagefault handler in the gtt pwrite fastpath. This is exercised by gem_mmap_gtt from the intel-gpu-toosl gem testsuite. v2: Chris Wilson noted the lack of an include. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38115 Cc: stable@kernel.org Signed-off-by:Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by:
Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Keith Packard <keithp@keithp.com>
parent
8ffc0246
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