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drm/i915: Add object locking to vm_fault_cpu

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Take a simple lock so we hold ww around (un)pin_pages as needed.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210323155059.628690-24-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2021-03-23 16:50:12 +01:00 committed by Daniel Vetter
parent 1b321026e2
commit 9fa1f4785f
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/gem/i915_gem_mman.c
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@ -246,6 +246,9 @@ static vm_fault_t vm_fault_cpu(struct vm_fault *vmf)
area->vm_flags & VM_WRITE))
return VM_FAULT_SIGBUS;
if (i915_gem_object_lock_interruptible(obj, NULL))
return VM_FAULT_NOPAGE;
err = i915_gem_object_pin_pages(obj);
if (err)
goto out;
@ -269,6 +272,7 @@ static vm_fault_t vm_fault_cpu(struct vm_fault *vmf)
i915_gem_object_unpin_pages(obj);
out:
i915_gem_object_unlock(obj);
return i915_error_to_vmf_fault(err);
}