[ 3.5.y.z extended stable ] Patch "floppy: don't call alloc_ordered_workqueue inside the" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    floppy: don't call alloc_ordered_workqueue inside the

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From 9984116477eeb96a4cd9935c5b695821bd236295 Mon Sep 17 00:00:00 2001
From: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
Date: Mon, 27 Aug 2012 20:56:51 -0300
Subject: [PATCH] floppy: don't call alloc_ordered_workqueue inside the
 alloc_disk loop
X-Extended-Stable: 3.5

commit b54e1f88897bcacc2cd359f48ea3b39eaf55f084 upstream.

Since commit 070ad7e ("floppy: convert to delayed work and single-thread
wq"), we end up calling alloc_ordered_workqueue multiple times inside
the loop, which shouldn't be intended. Besides the leak, other side
effect in the current code is if blk_init_queue fails, we would end up
calling unregister_blkdev even if we didn't call yet register_blkdev.

Just moved the allocation of floppy_wq before the loop, and adjusted the
code accordingly.

Acked-by: Vivek Goyal <vgoyal at redhat.com>
Reviewed-by: Ben Hutchings <ben at decadent.org.uk>
Signed-off-by: Jiri Kosina <jkosina at suse.cz>
Signed-off-by: Jens Axboe <axboe at kernel.dk>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 drivers/block/floppy.c |   15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 553f43a..3817084 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4138,6 +4138,10 @@ static int __init floppy_init(void)

 	raw_cmd = NULL;

+	floppy_wq = alloc_ordered_workqueue("floppy", 0);
+	if (!floppy_wq)
+		return -ENOMEM;
+
 	for (dr = 0; dr < N_DRIVE; dr++) {
 		disks[dr] = alloc_disk(1);
 		if (!disks[dr]) {
@@ -4145,16 +4149,10 @@ static int __init floppy_init(void)
 			goto out_put_disk;
 		}

-		floppy_wq = alloc_ordered_workqueue("floppy", 0);
-		if (!floppy_wq) {
-			err = -ENOMEM;
-			goto out_put_disk;
-		}
-
 		disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
 		if (!disks[dr]->queue) {
 			err = -ENOMEM;
-			goto out_destroy_workq;
+			goto out_put_disk;
 		}

 		blk_queue_max_hw_sectors(disks[dr]->queue, 64);
@@ -4318,8 +4316,6 @@ out_release_dma:
 out_unreg_region:
 	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
 	platform_driver_unregister(&floppy_driver);
-out_destroy_workq:
-	destroy_workqueue(floppy_wq);
 out_unreg_blkdev:
 	unregister_blkdev(FLOPPY_MAJOR, "fd");
 out_put_disk:
@@ -4335,6 +4331,7 @@ out_put_disk:
 		}
 		put_disk(disks[dr]);
 	}
+	destroy_workqueue(floppy_wq);
 	return err;
 }

--
1.7.9.5