linux-kernel - [ 35/82] floppy: properly handle failure on add

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Message-Id: <20121114053938.731103602@decadent.org.uk>
Date:	Wed, 14 Nov 2012 05:40:08 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>,
	Jiri Kosina <jkosina@...e.cz>, Jens Axboe <axboe@...nel.dk>
Subject: [ 35/82] floppy: properly handle failure on add_disk loop

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>

commit d60e7ec18c3fb2cbf90969ccd42889eb2d03aef9 upstream.

On floppy initialization, if something failed inside the loop we call
add_disk, there was no cleanup of previous iterations in the error
handling.

Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/block/floppy.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4305,7 +4305,7 @@ static int __init floppy_init(void)
 
 		err = platform_device_register(&floppy_device[drive]);
 		if (err)
-			goto out_flush_work;
+			goto out_remove_drives;
 
 		err = device_create_file(&floppy_device[drive].dev,
 					 &dev_attr_cmos);
@@ -4323,6 +4323,15 @@ static int __init floppy_init(void)
 
 out_unreg_platform_dev:
 	platform_device_unregister(&floppy_device[drive]);
+out_remove_drives:
+	while (drive--) {
+		if ((allowed_drive_mask & (1 << drive)) &&
+		    fdc_state[FDC(drive)].version != FDC_NONE) {
+			del_gendisk(disks[drive]);
+			device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
+			platform_device_unregister(&floppy_device[drive]);
+		}
+	}
 out_flush_work:
 	flush_work_sync(&floppy_work);
 	if (atomic_read(&usage_count))


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