linux-kernel - [PATCH 09/14] swim: add a floppy registration bool which triggers del

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Date:   Fri,  3 Sep 2021 18:35:31 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk, efremov@...ux.com, hch@....de
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH 09/14] swim: add a floppy registration bool which triggers del_gendisk()

Instead of calling del_gendisk() on exit alone, let's add
a registration bool to the floppy disk state, this way this can
be done on the shared caller, swim_cleanup_floppy_disk().

This will be more useful in subsequent patches. Right now, this
just shuffles functionality out to a helper in a safe way.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/block/swim.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index 3deb9d9a59c0..b3ee3dad5a8c 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -184,6 +184,7 @@ struct floppy_state {
 
 	int		track;
 	int		ref_count;
+	bool registered;
 
 	struct gendisk *disk;
 	struct blk_mq_tag_set tag_set;
@@ -778,6 +779,9 @@ static void swim_cleanup_floppy_disk(struct floppy_state *fs)
 	if (!disk)
 		return;
 
+	if (fs->registered)
+		del_gendisk(fs->disk);
+
 	blk_cleanup_disk(disk);
 	blk_mq_free_tag_set(&fs->tag_set);
 }
@@ -839,6 +843,7 @@ static int swim_floppy_init(struct swim_priv *swd)
 		swd->unit[drive].disk->private_data = &swd->unit[drive];
 		set_capacity(swd->unit[drive].disk, 2880);
 		add_disk(swd->unit[drive].disk);
+		swd->unit[drive].registered = true;
 	}
 
 	return 0;
@@ -915,10 +920,8 @@ static int swim_remove(struct platform_device *dev)
 	int drive;
 	struct resource *res;
 
-	for (drive = 0; drive < swd->floppy_count; drive++) {
-		del_gendisk(swd->unit[drive].disk);
+	for (drive = 0; drive < swd->floppy_count; drive++)
 		swim_cleanup_floppy_disk(&swd->unit[drive]);
-	}
 
 	unregister_blkdev(FLOPPY_MAJOR, "fd");
 
-- 
2.30.2