From 3622b86f49f84e52fb41fee9eb55f9290613dfc3 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 20 Dec 2022 09:08:12 +0100 Subject: dma-mapping: reject GFP_COMP for noncoherent allocations While not quite as bogus as for the dma-coherent allocations that were fixed earlier, GFP_COMP for these allocations has no benefits for the dma-direct case, and can't be supported at all by dma dma-iommu backend which splits up allocations into smaller orders. Due to an oversight in ffcb75458460 that flag stopped being cleared for all dma allocations, but only got rejected for coherent ones, so fix up these callers to not allow __GFP_COMP as well after the sound code has been fixed to not ask for it. Fixes: ffcb75458460 ("dma-mapping: reject __GFP_COMP in dma_alloc_attrs") Reported-by: Mikhail Gavrilov Reported-by: Kai Vehmanen Signed-off-by: Christoph Hellwig Acked-by: Takashi Iwai Tested-by: Mikhail Gavrilov Tested-by: Kai Vehmanen --- kernel/dma/mapping.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'kernel/dma') diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index c026a5a5e046..68106e3791f6 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -560,6 +560,8 @@ static struct page *__dma_alloc_pages(struct device *dev, size_t size, return NULL; if (WARN_ON_ONCE(gfp & (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM))) return NULL; + if (WARN_ON_ONCE(gfp & __GFP_COMP)) + return NULL; size = PAGE_ALIGN(size); if (dma_alloc_direct(dev, ops)) @@ -645,6 +647,8 @@ struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size, if (WARN_ON_ONCE(attrs & ~DMA_ATTR_ALLOC_SINGLE_PAGES)) return NULL; + if (WARN_ON_ONCE(gfp & __GFP_COMP)) + return NULL; if (ops && ops->alloc_noncontiguous) sgt = ops->alloc_noncontiguous(dev, size, dir, gfp, attrs); -- cgit v1.2.3