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drm/i915: Initialise userptr mmu_notifier serial to 1

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During the range invalidate, we walk the list of buffers associated with
the mmu_notifer and find the ones that overlap the range. An
optimisation is made to speed up the iteration by assuming the previous
iter is still valid whilst the tree is unmodified. This exposes a bug
when a range invalidate is triggered after we have just created the
mmu_notifier, but before attaching any buffers. In that case, we presume
we have an unmodified list and start walking from the last iter which is
NULL. Oops.

The easiest fix is then to initialise the serial of the tree to 1.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Testecase: igt/gem_userptr_blts/stress-mm
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2014-07-11 11:28:01 +01:00 committed by Daniel Vetter
parent a1db2fa7c8
commit 6c308fecb4
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_gem_userptr.c
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@ -150,7 +150,7 @@ i915_mmu_notifier_get(struct drm_device *dev, struct mm_struct *mm)
mmu->mm = mm;
mmu->objects = RB_ROOT;
mmu->count = 0;
mmu->serial = 0;
mmu->serial = 1;
/* Protected by mmap_sem (write-lock) */
ret = __mmu_notifier_register(&mmu->mn, mm);