Sometimes it is good to know when your mapping failed.
Fixes: cafaf14a5d8f ("io-mapping: Always create a struct to hold metadata about the io-mapping"
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
---
include/linux/io-mapping.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
index 0beaa3eba155..5641e06cbcf7 100644
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -118,7 +118,7 @@ io_mapping_init_wc(struct io_mapping *iomap,
iomap->prot = pgprot_noncached(PAGE_KERNEL);
#endif
- return iomap;
+ return iomap->iomem ? iomap : NULL;
}
static inline void
--
2.21.0
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