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drm: Convert cmpxchg(bool) back to a two step operation 

ARM v6 (at least) only allows cmpxchg on 32bit variables which doesn't
always include the bool type.

drivers/built-in.o: In function `vblank_disable_and_save':
imx-ocotp.c:(.text+0xb45e8): undefined reference to `__bad_cmpxchg'
Makefile:986: recipe for target 'vmlinux' failed

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Reported-by: Leonard Crestez <leonard.crestez@nxp.com>
Fixes: 43dc7fe2b2 ("drm: Mark up accesses of vblank->enabled outside of its spinlock")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170330140832.32377-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-03-30 15:08:32 +01:00 committed by Ville Syrjälä
parent f56c9202b5
commit f5f4c61598
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_irq.c
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@ -338,8 +338,10 @@ static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
* calling the ->disable_vblank() operation in atomic context with the
* hardware potentially runtime suspended.
*/
if (cmpxchg_relaxed(&vblank->enabled, true, false))
if (vblank->enabled) {
__disable_vblank(dev, pipe);
vblank->enabled = false;
}
/*
* Always update the count and timestamp to maintain the