n64cart: add error handling support for add_disk()

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/n64cart.c b/drivers/block/n64cart.c
index b168ca2..78282f0 100644 (file)
--- a/drivers/block/n64cart.c
+++ b/drivers/block/n64cart.c
@@ -115,6 +115,7 @@ static const struct block_device_operations n64cart_fops = {
 static int __init n64cart_probe(struct platform_device *pdev)
 {
        struct gendisk *disk;
+       int err = -ENOMEM;
 
        if (!start || !size) {
                pr_err("start or size not specified\n");
@@ -132,7 +133,7 @@ static int __init n64cart_probe(struct platform_device *pdev)
 
        disk = blk_alloc_disk(NUMA_NO_NODE);
        if (!disk)
-               return -ENOMEM;
+               goto out;
 
        disk->first_minor = 0;
        disk->flags = GENHD_FL_NO_PART_SCAN;
@@ -147,11 +148,18 @@ static int __init n64cart_probe(struct platform_device *pdev)
        blk_queue_physical_block_size(disk->queue, 4096);
        blk_queue_logical_block_size(disk->queue, 4096);
 
-       add_disk(disk);
+       err = add_disk(disk);
+       if (err)
+               goto out_cleanup_disk;
 
        pr_info("n64cart: %u kb disk\n", size / 1024);
 
        return 0;
+
+out_cleanup_disk:
+       blk_cleanup_disk(disk);
+out:
+       return err;
 }
 
 static struct platform_driver n64cart_driver = {