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@linux-foundation.org Cc: Mike Rapoport rppt@linux.ibm.com Cc: Andy Shevchenko andriy.shevchenko@linux.intel.com Cc: Chris Wilson chris@chris-wilson.co.uk Cc: stable@vger.kernel.org Signed-off-by: Michael J. Ruhl michael.j.ruhl@intel.com --- 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