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authorJesse Barnes <jbarnes@nietzche.virtuousgeek.org>2008-02-07 10:40:06 -0800
committerJesse Barnes <jbarnes@nietzche.virtuousgeek.org>2008-02-07 10:40:06 -0800
commit79d69285202b55f269aa88a6bcda257257c9dee3 (patch)
tree7b68a0e162b885ae77fc00e8d8e14e2ccc190f25 /linux-core/Kconfig
parent76748efae2f51409813eeb6b91b783c73cb2845e (diff)
Fix vblank enable/disable callbacks
There were two problems with the existing callback code: the vblank enable callback happened multiple times per disable, making drivers more complex than they had to be, and there was a race between the final decrement of the vblank usage counter and the next enable call, which could have resulted in a put->schedule disable->get->enable->disable sequence, which would be bad. So add a new vblank_enabled array to track vblank enable on per-pipe basis, and add a lock to protect it along with the refcount + enable/disable calls to fix the race.
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