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path: root/drivers/dax/super.c
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Diffstat (limited to 'drivers/dax/super.c')
-rw-r--r--drivers/dax/super.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index e84070b55463..edc279be3e59 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -46,7 +46,8 @@ EXPORT_SYMBOL_GPL(dax_read_unlock);
int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
pgoff_t *pgoff)
{
- phys_addr_t phys_off = (get_start_sect(bdev) + sector) * 512;
+ sector_t start_sect = bdev ? get_start_sect(bdev) : 0;
+ phys_addr_t phys_off = (start_sect + sector) * 512;
if (pgoff)
*pgoff = PHYS_PFN(phys_off);