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drm/i915/selftests: Lock the drm_mm as we search

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Hold onto the vm->mutex (to lock the drm_mm) to ensure that the rbtree
is stable as we search it for our scratch node.

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/20200128183458.3860022-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2020-01-28 18:34:58 +00:00
parent 0543fbf4fd
commit 6717f7c32b
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
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@ -1465,9 +1465,12 @@ out_file:
static int check_scratch(struct i915_address_space *vm, u64 offset)
{
struct drm_mm_node *node =
__drm_mm_interval_first(&vm->mm,
offset, offset + sizeof(u32) - 1);
struct drm_mm_node *node;
mutex_lock(&vm->mutex);
node = __drm_mm_interval_first(&vm->mm,
offset, offset + sizeof(u32) - 1);
mutex_unlock(&vm->mutex);
if (!node || node->start > offset)
return 0;