linux-kernel - [PATCH v4 3/4] floppy: address add

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Date:   Wed,  3 Nov 2021 11:12:57 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk, hch@....de, penguin-kernel@...ove.sakura.ne.jp,
        dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...el.com, richard@....at,
        miquel.raynal@...tlin.com, vigneshr@...com, efremov@...ux.com,
        song@...nel.org, martin.petersen@...cle.com, hare@...e.de,
        jack@...e.cz, ming.lei@...hat.com, tj@...nel.org, mcgrof@...nel.org
Cc:     linux-mtd@...ts.infradead.org, linux-scsi@...r.kernel.org,
        linux-raid@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/4] floppy: address add_disk() error handling on probe

We need to cleanup resources on the probe() callback registered
with __register_blkdev(), now that add_disk() error handling is
supported. Address this.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/block/floppy.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 3873e789478e..255e88efb535 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4522,6 +4522,7 @@ static void floppy_probe(dev_t dev)
 {
 	unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5);
 	unsigned int type = (MINOR(dev) >> 2) & 0x1f;
+	int err = 0;
 
 	if (drive >= N_DRIVE || !floppy_available(drive) ||
 	    type >= ARRAY_SIZE(floppy_type))
@@ -4529,10 +4530,20 @@ static void floppy_probe(dev_t dev)
 
 	mutex_lock(&floppy_probe_lock);
 	if (!disks[drive][type]) {
-		if (floppy_alloc_disk(drive, type) == 0)
-			add_disk(disks[drive][type]);
+		err = floppy_alloc_disk(drive, type);
+		if (err == 0) {
+			err = add_disk(disks[drive][type]);
+			if (err)
+				goto err_out;
+		}
 	}
 	mutex_unlock(&floppy_probe_lock);
+	return;
+
+err_out:
+	blk_cleanup_disk(disks[drive][type]);
+	disks[drive][type] = NULL;
+	mutex_unlock(&floppy_probe_lock);
 }
 
 static int __init do_floppy_init(void)
-- 
2.33.0