[Bug 73083] Semi-repeatable SIGBUS in R600UploadToScreenCS's memcpy

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73083

--- Comment #4 from François Guerraz <kubrick at fgv6.net> ---
Created attachment 91287
  --> https://bugs.freedesktop.org/attachment.cgi?id=91287&action=edit
Workaround for the evergreen driver

A similar patch for the evergreen family. The bug was reproducible 100% of the
time in my case (by uploading a bunch of pictures using the image uploader on
photobox.com using Firefox 26) and that fixes / work around the problem. It's
hard to tell if there is any performance impact because it used to be crashing.
But using the aforementioned uploader now trigger high (>50%) CPU usage for
Xorg.

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