lkml.org 
[lkml]   [2012]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3 1/6] floppy: don't call alloc_ordered_workqueue inside the alloc_disk loop
From
Date
On Mon, 2012-08-13 at 15:16 -0300, Herton Ronaldo Krzesinski wrote:
> 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.
>
> Cc: stable@vger.kernel.org # 3.5+
> Acked-by: Vivek Goyal <vgoyal@redhat.com>
> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>

Reviewed-by: Ben Hutchings <ben@decadent.org.uk>

> ---
> 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 a7d6347..c8d9e68 100644
> --- 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;
> }
>

--
Ben Hutchings
I say we take off; nuke the site from orbit. It's the only way to be sure.
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2012-08-14 04:42    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site