[Bug 94759] [BAT BSW] lockdep splat in drm_gem_mmap

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94759

--- Comment #2 from Joonas Lahtinen <joonas.lahtinen at linux.intel.com> ---
Also in gem_mmap_gtt, same chain:
[  145.549678] ======================================================
[  145.549739] [ INFO: possible circular locking dependency detected ]
[  145.549803] 4.6.0-rc1-gfxbench+ #1 Tainted: G     U         
[  145.549858] -------------------------------------------------------
[  145.549919] gem_mmap_gtt/5996 is trying to acquire lock:
[  145.549971]  (&dev->struct_mutex){+.+.+.}, at: [<ffffffff8151c781>]
drm_gem_mmap+0x1a1/0x270
[  145.550077] 
but task is already holding lock:
[  145.550134]  (&mm->mmap_sem){++++++}, at: [<ffffffff81183204>]
vm_mmap_pgoff+0x44/0xa0
[  145.550230] 
which lock already depends on the new lock.

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