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authorJesse Barnes <jbarnes@virtuousgeek.org>2009-05-05 16:03:48 -0700
committerEric Anholt <eric@anholt.net>2009-05-14 16:00:27 -0700
commit802c7eb646848d769a07704c16f7a3bbec9e5829 (patch)
tree49cdcc60c01c0d0893d285423f04d39d7eabfb2b /drivers/uwb
parent0ba0e9e1f173a59ba402a253d356612c821b7a14 (diff)
drm/i915: sanity check IER at wait_request time
We might sleep here anyway so I hope an extra uncached read is ok to add. In #20896 we found that vbetool clobbers the IER. In KMS mode this is particularly bad since we don't set the interrupt regs late (in EnterVT), so we'd fail to get *any* interrupts at all after X started (since some distros have scripts that call vbetool at X startup apparently). So this patch checks IER at wait_request time, and re-enables interrupts if it's been clobbered. In a proper config this check should never be triggered. This is really a distro issue, but having a sanity check is nice, as long as it doesn't have a real performance hit. Tested-by: Mateusz Kaduk <mateusz.kaduk@gmail.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> [anholt: Moved the check inside of the sleeping case to avoid perf cost] Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/uwb')
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