[PATCH] drm/ttm: Clear the ghost cpu_writers flag on ttm_buffer_object_transfer.

[Marcin Slusarz]

On Tue, Sep 21, 2010 at 02:15:15AM +0200, Francisco Jerez wrote:
> It makes sense for a BO to move after a process has requested
> exclusive RW access on it (e.g. because the BO used to be located in
> unmappable VRAM and we intercepted the CPU access from the fault
> handler).
> 
> If we let the ghost object inherit cpu_writers from the original
> object, ttm_bo_release_list() will raise a kernel BUG when the ghost
> object is destroyed. This can be reproduced with the nouveau driver on
> nv5x.
> 
> Reported-by: Marcin Slusarz <marcin.slusarz at gmail.com>
> Signed-off-by: Francisco Jerez <currojerez at riseup.net>

After few hours of testing, I can say:
Tested-by: Marcin Slusarz <marcin.slusarz at gmail.com>

Thanks,
Marcin