Re: [PATCH v14 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing
From: Christoph Hellwig <hch@lst.de>
Date: 2021-06-24 05:43:24
Also in:
intel-gfx, linux-devicetree, linux-iommu, linuxppc-dev, lkml, xen-devel
On Wed, Jun 23, 2021 at 02:44:34PM -0400, Qian Cai wrote:
is_swiotlb_force_bounce at /usr/src/linux-next/./include/linux/swiotlb.h:119
is_swiotlb_force_bounce() was the new function introduced in this patch here.
+static inline bool is_swiotlb_force_bounce(struct device *dev)
+{
+ return dev->dma_io_tlb_mem->force_bounce;
+}To me the crash looks like dev->dma_io_tlb_mem is NULL. Can you turn this into : return dev->dma_io_tlb_mem && dev->dma_io_tlb_mem->force_bounce; for a quick debug check?