io-mapping: ensure io_mapping_map_atomic _is_ atomic
authorDaniel Vetter <daniel.vetter@ffwll.ch>
Wed, 28 Sep 2011 09:57:23 +0000 (11:57 +0200)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 11 Nov 2011 17:43:16 +0000 (09:43 -0800)
commit12b9a1c1f27e73e4ff6e57f1787eed9d06429f74
tree60335022465302c5b77e6639aa4894ffd52917f4
parentac155955e6fa06982e0a310c154c279aad0cc91f
io-mapping: ensure io_mapping_map_atomic _is_ atomic

commit 24dd85ff723f142093f44244764b9b5c152235b8 upstream.

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
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
include/linux/io-mapping.h