linux-kernel - [PATCH v2 01/15] z2ram: add error handling support for add

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Date:   Mon, 27 Sep 2021 15:00:56 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk, justin@...aid.com, geert@...ux-m68k.org,
        ulf.hansson@...aro.org, hare@...e.de, tj@...nel.org,
        philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
        jdike@...toit.com, richard@....at, anton.ivanov@...bridgegreys.com,
        johannes.berg@...el.com, chris.obbard@...labora.com,
        krisman@...labora.com, zhuyifei1999@...il.com, thehajime@...il.com,
        chris@...kel.net, jcmvbkbc@...il.com, tim@...erelk.net
Cc:     linux-xtensa@...ux-xtensa.org, linux-um@...ts.infradead.org,
        linux-m68k@...ts.linux-m68k.org, drbd-dev@...ts.linbit.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH v2 01/15] z2ram: 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. Only the disk is cleaned up inside
z2ram_register_disk() as the caller deals with the rest.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/block/z2ram.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index 4eef218108c6..ccc52c935faf 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -318,6 +318,7 @@ static const struct blk_mq_ops z2_mq_ops = {
 static int z2ram_register_disk(int minor)
 {
 	struct gendisk *disk;
+	int err;
 
 	disk = blk_mq_alloc_disk(&tag_set, NULL);
 	if (IS_ERR(disk))
@@ -333,8 +334,10 @@ static int z2ram_register_disk(int minor)
 		sprintf(disk->disk_name, "z2ram");
 
 	z2ram_gendisk[minor] = disk;
-	add_disk(disk);
-	return 0;
+	err = add_disk(disk);
+	if (err)
+		blk_cleanup_disk(disk);
+	return err;
 }
 
 static int __init z2_init(void)
-- 
2.30.2