Messages in this thread Patch in this message | | | From | Vivek Goyal <> | Subject | [PATCH 1/2] floppy: Cleanup disk->queue before caling put_disk() if add_disk() was never called | Date | Mon, 30 Jan 2012 09:59:50 -0500 |
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add_disk() takes gendisk reference on request queue. If driver failed during initialization and never called add_disk() then that extra reference is not taken. That reference is put in put_disk(). floppy driver allocates the disk, allocates queue, sets disk->queue and then relizes that floppy controller is not present. It tries to tear down everything and tries to put a reference down in put_disk() which was never taken.
In such error cases cleanup disk->queue before calling put_disk() so that we never try to put down a reference which was never taken in first place.
Reported-and-tested-by: Suresh Jayaraman <sjayaraman@suse.com> Tested-by: Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Tejun Heo <tj@kernel.org> --- drivers/block/floppy.c | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 510fb10..401ba78 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -4368,8 +4368,14 @@ out_unreg_blkdev: out_put_disk: while (dr--) { del_timer_sync(&motor_off_timer[dr]); - if (disks[dr]->queue) + if (disks[dr]->queue) { blk_cleanup_queue(disks[dr]->queue); + /* + * put_disk() is not paired with add_disk() and + * will put queue reference one extra time. fix it. + */ + disks[dr]->queue = NULL; + } put_disk(disks[dr]); } return err; -- 1.7.4.4
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