[PATCH] m68k: set proper major_num when specifying module param major_num

[Chengguang Xu]

When calling register_blkdev() with specified major
device number, the return code is 0 on success.
So it seems not correct direct assign return code to
variable major_num in this case.

Signed-off-by: Chengguang Xu <cgxu...@gmx.com>
---
 arch/m68k/emu/nfblock.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/m68k/emu/nfblock.c b/arch/m68k/emu/nfblock.c
index 38049357d6d3..40712e49381b 100644
--- a/arch/m68k/emu/nfblock.c
+++ b/arch/m68k/emu/nfblock.c
@@ -155,18 +155,22 @@ static int __init nfhd_init_one(int id, u32 blocks, u32 
bsize)
 static int __init nfhd_init(void)
 {
        u32 blocks, bsize;
+       int ret;
        int i;
 
        nfhd_id = nf_get_id("XHDI");
        if (!nfhd_id)
                return -ENODEV;
 
-       major_num = register_blkdev(major_num, "nfhd");
-       if (major_num <= 0) {
+       ret = register_blkdev(major_num, "nfhd");
+       if (ret < 0) {
                pr_warn("nfhd: unable to get major number\n");
-               return major_num;
+               return ret;
        }
 
+       if (!major_num)
+               major_num = ret;
+
        for (i = NFHD_DEV_OFFSET; i < 24; i++) {
                if (nfhd_get_capacity(i, 0, &blocks, &bsize))
                        continue;
-- 
2.20.1