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-rw-r--r--drivers/block/nbd.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 28024248a..5a07964a1 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1646,7 +1646,8 @@ static int nbd_dev_add(int index)
if (err == -ENOSPC)
err = -EEXIST;
} else {
- err = idr_alloc(&nbd_index_idr, nbd, 0, 0, GFP_KERNEL);
+ err = idr_alloc(&nbd_index_idr, nbd, 0,
+ (MINORMASK >> part_shift) + 1, GFP_KERNEL);
if (err >= 0)
index = err;
}