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dma-direct: warn when coherent allocations aren't supported

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Log a warning once when dma_alloc_coherent fails because the platform
does not support coherent allocations at all.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Greg Ungerer <gerg@linux-m68k.org>
This commit is contained in:
Christoph Hellwig 2023-10-06 15:17:54 +02:00
parent b1da46d70e
commit 63f067e33c
1 changed files with 3 additions and 1 deletions
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4
kernel/dma/direct.c
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@ -240,8 +240,10 @@ void *dma_direct_alloc(struct device *dev, size_t size,
*/ */
set_uncached = IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED); set_uncached = IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED);
remap = IS_ENABLED(CONFIG_DMA_DIRECT_REMAP); remap = IS_ENABLED(CONFIG_DMA_DIRECT_REMAP);
if (!set_uncached && !remap) if (!set_uncached && !remap) {
pr_warn_once("coherent DMA allocations not supported on this platform.\n");
return NULL; return NULL;
}
} }
/* /*