drm/i915/selftests: Lock the drm_mm while modifying
Remember to lock the drm_mm as we modify it, lest it be modified in the background by retire/free workers! Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190703091726.11690-2-chris@chris-wilson.co.uk
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@ -414,7 +414,9 @@ static int igt_mmap_offset_exhaustion(void *arg)
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drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
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resv.start = hole_start;
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resv.size = hole_end - hole_start - 1; /* PAGE_SIZE units */
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mutex_lock(&i915->drm.struct_mutex);
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err = drm_mm_reserve_node(mm, &resv);
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mutex_unlock(&i915->drm.struct_mutex);
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if (err) {
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pr_err("Failed to trim VMA manager, err=%d\n", err);
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goto out_park;
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@ -478,7 +480,9 @@ static int igt_mmap_offset_exhaustion(void *arg)
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}
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out:
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mutex_lock(&i915->drm.struct_mutex);
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drm_mm_remove_node(&resv);
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mutex_unlock(&i915->drm.struct_mutex);
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out_park:
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restore_retire_worker(i915);
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return err;
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