From d01501f85249848a2497968d46dd46d5c6fe32e6 Mon Sep 17 00:00:00 2001
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Thu, 1 Nov 2018 07:54:24 +0000
Subject: [PATCH] MIPS: Fix `dma_alloc_coherent' returning a non-coherent
allocation
Fix a MIPS `dma_alloc_coherent' regression from commit bc3ec75de545
("dma-mapping: merge direct and noncoherent ops") that causes a cached
allocation to be returned on noncoherent cache systems.
This is due to an inverted check now used in the MIPS implementation of
`arch_dma_alloc' on the result from `dma_direct_alloc_pages' before
doing the cached-to-uncached mapping of the allocation address obtained.
The mapping has to be done for a non-NULL rather than NULL result,
because a NULL result means the allocation has failed.
Invert the check for correct operation then.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Fixes: bc3ec75de545 ("dma-mapping: merge direct and noncoherent ops")
Patchwork: https://patchwork.linux-mips.org/patch/20965/
---
arch/mips/mm/dma-noncoherent.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
index e6c9485cadcff..cb38461391cb7 100644
--- a/arch/mips/mm/dma-noncoherent.c
+++ b/arch/mips/mm/dma-noncoherent.c
@@ -50,7 +50,7 @@ void *arch_dma_alloc(struct device *dev, size_t size,
void *ret;
ret = dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
- if (!ret && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
+ if (ret && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
dma_cache_wback_inv((unsigned long) ret, size);
ret = (void *)UNCAC_ADDR(ret);
}
--
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