[Bug 75061] bug in clearing color buffer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75061

--- Comment #12 from Marek Olšák <maraeo at gmail.com> ---
All writes to valid_buffer_range are protected by a mutex. Only the reads are
not.

I've got no idea what to do with invalidate_buffer. If we added mutexes
everywhere, it would slow down the driver.

I think that calling BufferData in one thread and using the buffer for
rendering in some other thread is a race condition in the application and
should be fixed in the app.

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