Messages in this thread | | | Date | Thu, 30 Sep 2021 07:46:37 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCH 1/2] dma-mapping: remove bogus test for pfn_valid from dma_map_resource |
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On Thu, Sep 30, 2021 at 04:30:38AM +0300, Mike Rapoport wrote: > From: Mike Rapoport <rppt@linux.ibm.com> > > 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 has this > check, simply drop the pfn_valid() test from dma_map_resource(). > > Link: https://lore.kernel.org/all/20210824173741.GC623@arm.com/ > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
We'll lose a bit of a sanity check with this, but given the problems it caused:
Reviewed-by: Christoph Hellwig <hch@lst.de>
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