[ 06/24] floppy: dont call alloc_ordered_workqueue inside the alloc_disk loop

Greg Kroah-Hartman
2012-11-02T17:12:42Z

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

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@redhat.com>
Reviewed-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/block/floppy.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)

--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4138,6 +4138,10 @@ static int __init do_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 do_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;
}