[Bug 3217] Computer hangs during X.org shutdown. I get bad page state at __free_pages_ok if I /etc/init.d/xdm stop. i915 glx xorg 6.8.99.3

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https://bugs.freedesktop.org/show_bug.cgi?id=3217          
     




------- Additional Comments From vs...@al...  2005-05-21 10:36 -------
Created an attachment (id=2733)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=2733&action=view)
patch to fix drm_pci_alloc() so that subsequent drm_pci_free() works

Seems that the problem is that the drm_pci_alloc() implementation for Linux
forgot to set the dmah->size field in the new drm_dma_handle_t structure. 
Because of this, subsequent drm_pci_free() passed bogus size to
pci_free_consistent(), which was leading to lots of "Bad page state" messages,
and subsequently to massive memory corruption resulting in a hang.

Most drivers do not use drm_pci_alloc() and drm_pci_free(), therefore they were
not hit by this problem.  Of course, the DRM core for Linux uses
drm_pci_free(), but it does not pass the drm_dma_handle_t structure from
drm_pci_alloc() to it - instead it fills that structure directly, setting
->size correctly and thus avoiding the bug.

This patch should fix the problem; unfortunately, I cannot get it tested on the
problematic hardware until Monday.          
     
     
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