linux-kernel - [PATCH 4/9] bcache: add error handling support for add

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Date:   Fri, 15 Oct 2021 16:30:23 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        agk@...hat.com, snitzer@...hat.com, colyli@...e.de,
        kent.overstreet@...il.com, boris.ostrovsky@...cle.com,
        jgross@...e.com, sstabellini@...nel.org, roger.pau@...rix.com,
        geert@...ux-m68k.org, ulf.hansson@...aro.org, tj@...nel.org,
        hare@...e.de, jdike@...toit.com, richard@....at,
        anton.ivanov@...bridgegreys.com, johannes.berg@...el.com,
        krisman@...labora.com, chris.obbard@...labora.com,
        thehajime@...il.com, zhuyifei1999@...il.com, haris.iqbal@...os.com,
        jinpu.wang@...os.com, miquel.raynal@...tlin.com, vigneshr@...com,
        linux-mtd@...ts.infradead.org
Cc:     linux-scsi@...r.kernel.org, dm-devel@...hat.com,
        linux-bcache@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-m68k@...ts.linux-m68k.org, linux-um@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH 4/9] bcache: 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.

This driver doesn't do any unwinding with blk_cleanup_disk()
even on errors after add_disk() and so we follow that
tradition.

Acked-by: Coly Li <colyli@...e.de>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/md/bcache/super.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index f2874c77ff79..f0c32cdd6594 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1082,7 +1082,9 @@ int bch_cached_dev_run(struct cached_dev *dc)
 		closure_sync(&cl);
 	}
 
-	add_disk(d->disk);
+	ret = add_disk(d->disk);
+	if (ret)
+		goto out;
 	bd_link_disk_holder(dc->bdev, dc->disk.disk);
 	/*
 	 * won't show up in the uevent file, use udevadm monitor -e instead
@@ -1534,10 +1536,11 @@ static void flash_dev_flush(struct closure *cl)
 
 static int flash_dev_run(struct cache_set *c, struct uuid_entry *u)
 {
+	int err = -ENOMEM;
 	struct bcache_device *d = kzalloc(sizeof(struct bcache_device),
 					  GFP_KERNEL);
 	if (!d)
-		return -ENOMEM;
+		goto err_ret;
 
 	closure_init(&d->cl, NULL);
 	set_closure_fn(&d->cl, flash_dev_flush, system_wq);
@@ -1551,9 +1554,12 @@ static int flash_dev_run(struct cache_set *c, struct uuid_entry *u)
 	bcache_device_attach(d, c, u - c->uuids);
 	bch_sectors_dirty_init(d);
 	bch_flash_dev_request_init(d);
-	add_disk(d->disk);
+	err = add_disk(d->disk);
+	if (err)
+		goto err;
 
-	if (kobject_add(&d->kobj, &disk_to_dev(d->disk)->kobj, "bcache"))
+	err = kobject_add(&d->kobj, &disk_to_dev(d->disk)->kobj, "bcache");
+	if (err)
 		goto err;
 
 	bcache_device_link(d, c, "volume");
@@ -1567,7 +1573,8 @@ static int flash_dev_run(struct cache_set *c, struct uuid_entry *u)
 	return 0;
 err:
 	kobject_put(&d->kobj);
-	return -ENOMEM;
+err_ret:
+	return err;
 }
 
 static int flash_devs_run(struct cache_set *c)
-- 
2.30.2