From: Vivek Goyal Date: Wed, 8 Feb 2012 19:03:38 +0000 (+0100) Subject: floppy: Cleanup disk->queue before caling put_disk() if add_disk() was never called X-Git-Tag: v3.3-rc4~33^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3f9a5aabd0a9fe0e0cd308506f48963d79169aa7;p=profile%2Fivi%2Fkernel-x86-ivi.git floppy: Cleanup disk->queue before caling put_disk() if add_disk() was never called 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 Tested-by: Dirk Gouders Signed-off-by: Vivek Goyal Acked-by: Tejun Heo Signed-off-by: Jens Axboe --- 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;