linux-kernel - [RFC 03/12] floppy: add error handling support for add

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Message-Id: <20210715205920.2023980-4-mcgrof@kernel.org>
Date:   Thu, 15 Jul 2021 13:59:11 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk
Cc:     hare@...e.de, bvanassche@....org, ming.lei@...hat.com,
        hch@...radead.org, jack@...e.cz, osandov@...com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [RFC 03/12] floppy: 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.

We take advantage of the new ability of del_gendisk() ...

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/block/floppy.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index ba690affc751..cad17b49e700 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4478,6 +4478,7 @@ static const struct blk_mq_ops floppy_mq_ops = {
 };
 
 static struct platform_device floppy_device[N_DRIVE];
+static bool registered[N_DRIVE];
 
 static bool floppy_available(int drive)
 {
@@ -4693,8 +4694,12 @@ static int __init do_floppy_init(void)
 		if (err)
 			goto out_remove_drives;
 
-		device_add_disk(&floppy_device[drive].dev, disks[drive][0],
-				NULL);
+		registered[drive] = true;
+
+		err = device_add_disk(&floppy_device[drive].dev,
+				      disks[drive][0], NULL);
+		if (err)
+			goto out_remove_drives;
 	}
 
 	return 0;
@@ -4703,7 +4708,8 @@ static int __init do_floppy_init(void)
 	while (drive--) {
 		if (floppy_available(drive)) {
 			del_gendisk(disks[drive][0]);
-			platform_device_unregister(&floppy_device[drive]);
+			if (registered[drive])
+				platform_device_unregister(&floppy_device[drive]);
 		}
 	}
 out_release_dma:
@@ -4946,7 +4952,8 @@ static void __exit floppy_module_exit(void)
 				if (disks[drive][i])
 					del_gendisk(disks[drive][i]);
 			}
-			platform_device_unregister(&floppy_device[drive]);
+			if (registered[drive])
+				platform_device_unregister(&floppy_device[drive]);
 		}
 		for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
 			if (disks[drive][i])
-- 
2.27.0