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-rw-r--r--block/genhd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 397960cf26a..e1eadcc9546 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1087,6 +1087,14 @@ dev_t blk_lookup_devt(const char *name, int partno)
if (strcmp(dev_name(dev), name))
continue;
+ if (partno < disk->minors) {
+ /* We need to return the right devno, even
+ * if the partition doesn't exist yet.
+ */
+ devt = MKDEV(MAJOR(dev->devt),
+ MINOR(dev->devt) + partno);
+ break;
+ }
part = disk_get_part(disk, partno);
if (part) {
devt = part_devt(part);