omapdrm/pvr kernel crash with camera capture and display application

[Tomi Valkeinen]

Hi,

On 02/12/14 14:41, Vikas Patil wrote:
> Hi All,
> 
> What I found is UnwrapExtMemoryCallBack() function from
> eurasia_km\services4\srvkm\common\devicemem.c always calls
> omap_gem_put_pages(), however just before the crash  it calls
> omap_gem_put_paddr() and it crashes in it due to  NULL pointer
> dereference of  &obj->dev->struct_mutex. instead of
> omap_gem_put_pages(). Does this gives any clue on what might be going
> wrong? What OMAP_BO_TILED_MASK signifies?

OMAP_BO_TILED_MASK tells that the buffer has been allocated with TILER.

I'm not really familiar with this stuff, but I presume a matching
operation is done in PVRSRVImportGEMKM().

But but... If &obj->dev->struct_mutex causes a NULL ref, it sounds to me
that the memory has already been released, or somehow else a NULL has
gotten into there.

Even if the code would accidentally call omap_gem_put_paddr instead of
omap_gem_put_pages, the struct_mutex should be fine.

 Tomi


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: OpenPGP digital signature
URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20141202/3b413e0b/attachment.sig>