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| author | Christoph Hellwig <hch@lst.de> | 2023-10-06 15:17:54 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2023-10-22 16:38:54 +0200 |
| commit | 63f067e33c996a6e4d9a34d138116a43105182f1 (patch) | |
| tree | c5a81810d07deafc6e022e29365534fe55360a1d /kernel/dma | |
| parent | b1da46d70e5427a9ba5eae28bcca29a20e68a442 (diff) | |
| download | linux-63f067e33c996a6e4d9a34d138116a43105182f1.tar.gz linux-63f067e33c996a6e4d9a34d138116a43105182f1.tar.bz2 linux-63f067e33c996a6e4d9a34d138116a43105182f1.zip | |
dma-direct: warn when coherent allocations aren't supported
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>
Diffstat (limited to 'kernel/dma')
| -rw-r--r-- | kernel/dma/direct.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 9657ef7c055e..ed3056eb20b8 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -240,8 +240,10 @@ void *dma_direct_alloc(struct device *dev, size_t size, */ set_uncached = IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED); 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; + } } /* |