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Diffstat (limited to 'lib/swiotlb.c')
-rw-r--r--lib/swiotlb.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 3c365ab6c..76f29ecba 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -29,10 +29,10 @@
#include <linux/ctype.h>
#include <linux/highmem.h>
#include <linux/gfp.h>
+#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/dma.h>
-#include <asm/scatterlist.h>
#include <linux/init.h>
#include <linux/bootmem.h>
@@ -656,7 +656,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
*/
phys_addr_t paddr = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
if (paddr == SWIOTLB_MAP_ERROR)
- return NULL;
+ goto err_warn;
ret = phys_to_virt(paddr);
dev_addr = phys_to_dma(hwdev, paddr);
@@ -670,7 +670,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
swiotlb_tbl_unmap_single(hwdev, paddr,
size, DMA_TO_DEVICE);
- return NULL;
+ goto err_warn;
}
}
@@ -678,6 +678,13 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
memset(ret, 0, size);
return ret;
+
+err_warn:
+ pr_warn("swiotlb: coherent allocation failed for device %s size=%zu\n",
+ dev_name(hwdev), size);
+ dump_stack();
+
+ return NULL;
}
EXPORT_SYMBOL(swiotlb_alloc_coherent);