drm/amdgpu: fix locking in vega10_ih_prescreen_iv
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Web: https://git.kernel.org/torvalds/c/153b9e1b75441cd51f69e88b4748c23166de0d64 Commit: 153b9e1b75441cd51f69e88b4748c23166de0d64 Parent: d3aab672de4902ce25e9858fbb5bf67e8254b23c Refname: refs/heads/master Author: Christian König <[email protected]> AuthorDate: Wed Jan 24 13:37:48 2018 +0100 Committer: Alex Deucher <[email protected]> CommitDate: Mon Jan 29 23:16:20 2018 -0500 drm/amdgpu: fix locking in vega10_ih_prescreen_iv The vm pointer can become invalid as soon as the lock is released. Signed-off-by: Christian König <[email protected]> Acked-by: Alex Deucher <[email protected]> Signed-off-by: Alex Deucher <[email protected]> --- drivers/gpu/drm/amd/amdgpu/vega10_ih.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/vega10_ih.c b/drivers/gpu/drm/amd/amdgpu/vega10_ih.c index b69ceafb7888..746748e6b731 100644 --- a/drivers/gpu/drm/amd/amdgpu/vega10_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/vega10_ih.c @@ -278,9 +278,9 @@ static bool vega10_ih_prescreen_iv(struct amdgpu_device *adev) /* Track retry faults in per-VM fault FIFO. */ spin_lock(&adev->vm_manager.pasid_lock); vm = idr_find(&adev->vm_manager.pasid_idr, pasid); - spin_unlock(&adev->vm_manager.pasid_lock); if (WARN_ON_ONCE(!vm)) { /* VM not found, process it normally */ + spin_unlock(&adev->vm_manager.pasid_lock); amdgpu_ih_clear_fault(adev, key); return true; } @@ -288,9 +288,11 @@ static bool vega10_ih_prescreen_iv(struct amdgpu_device *adev) r = kfifo_put(&vm->faults, key); if (!r) { /* FIFO is full. Ignore it until there is space */ + spin_unlock(&adev->vm_manager.pasid_lock); amdgpu_ih_clear_fault(adev, key); goto ignore_iv; } + spin_unlock(&adev->vm_manager.pasid_lock); /* It's the first fault for this address, process it normally */ return true; -- To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html