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| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-01-06 10:21:24 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-23 14:55:30 -0700 |
| commit | 01e27a293ece260b0a40a61195d2e2ce046c565b (patch) | |
| tree | f050f7118a41c5e03a7e08aa33483860cb55a483 /kernel | |
| parent | f16b678a669cdd1cfb7488144c4af924a24e244b (diff) | |
| download | linux-stable-01e27a293ece260b0a40a61195d2e2ce046c565b.tar.gz | |
drm/i915: set vblank enabled flag correctly across IRQ install/uninstall
commit dc1336ff4fe08ae7cfe8301bfd7f0b2cfd31d20a upstream.
In the absence of kernel mode setting, many drivers disable IRQs across VT
switch. The core DRM vblank code is missing a check for this case however;
even after IRQ disable, the vblank code will still have the vblank_enabled
flag set, so unless we track the fact that they're disabled at IRQ uninstall
time, when we VT switch back in we won't actually re-enable them, which means
any apps waiting on vblank before the switch will hang.
This patch does that and also adds a sanity check to the wait condition to
look for the irq_enabled flag in general, as well as adding a wakeup to the
IRQ uninstall path.
Fixes fdo bug #18879 with compiz hangs at VT switch.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions