linux-kernel - [PATCH v4 2/4] ataflop: address add

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Date:   Wed,  3 Nov 2021 11:12:56 -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 2/4] ataflop: 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/ataflop.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 170dd193cef6..e981b351f37e 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -2012,6 +2012,7 @@ static void ataflop_probe(dev_t dev)
 {
 	int drive = MINOR(dev) & 3;
 	int type  = MINOR(dev) >> 2;
+	int err = 0;
 
 	if (type)
 		type--;
@@ -2019,11 +2020,20 @@ static void ataflop_probe(dev_t dev)
 	if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS)
 		return;
 	if (!unit[drive].disk[type]) {
-		if (ataflop_alloc_disk(drive, type) == 0) {
-			add_disk(unit[drive].disk[type]);
-			unit[drive].registered[type] = true;
+		err = ataflop_alloc_disk(drive, type);
+		if (err == 0) {
+			err = add_disk(unit[drive].disk[type]);
+			if (err)
+				goto err_out;
+			else
+				unit[drive].registered[type] = true;
 		}
 	}
+	return;
+
+err_out:
+	blk_cleanup_disk(unit[drive].disk[type]);
+	unit[drive].disk[type] = NULL;
 }
 
 static void atari_floppy_cleanup(void)
-- 
2.33.0