Re: [PATCH 1/2] dma-mapping: remove bogus test for pfn_valid from dma_map_resource

2021-09-30 Thread David Hildenbrand
On 30.09.21 03:30, Mike Rapoport wrote: From: Mike Rapoport dma_map_resource() uses pfn_valid() to ensure the range is not RAM. However, pfn_valid() only checks for availability of the memory map for a PFN but it does not ensure that the PFN is actually backed by RAM. As dma_map_resource() is

Re: [PATCH 1/2] dma-mapping: remove bogus test for pfn_valid from dma_map_resource

2021-09-29 Thread Christoph Hellwig
On Thu, Sep 30, 2021 at 04:30:38AM +0300, Mike Rapoport wrote: > From: Mike Rapoport > > dma_map_resource() uses pfn_valid() to ensure the range is not RAM. > However, pfn_valid() only checks for availability of the memory map for a > PFN but it does not ensure that the PFN is actually backed by

[PATCH 1/2] dma-mapping: remove bogus test for pfn_valid from dma_map_resource

2021-09-29 Thread Mike Rapoport
From: Mike Rapoport dma_map_resource() uses pfn_valid() to ensure the range is not RAM. However, pfn_valid() only checks for availability of the memory map for a PFN but it does not ensure that the PFN is actually backed by RAM. As dma_map_resource() is the only method in DMA mapping APIs that h