[Bug 206895] [amdgpu] crash while using opencl from amdgpu-pro on kernel 5.5.10

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206895

--- Comment #9 from bigbeeshane at gmail.com ---
Also validated last night that the following patch to disable the merging of sg
sections within dma-iommu fixes the issue I am seeing 


--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -779,7 +779,7 @@ static int __finalise_sg(struct device *dev, struct
scatterlist *sg, int nents,
                 * - but doesn't fall at a segment boundary
                 * - and wouldn't make the resulting output segment too long
                 */
-               if (cur_len && !s_iova_off && (dma_addr & seg_mask) &&
+               if (0 && cur_len && !s_iova_off && (dma_addr & seg_mask) &&
                    (max_len - cur_len >= s_length)) {


I guess amdgpu needs to be updated to handle the case where the iommu driver is
merging some of the requested segments ?

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