[PATCH v2 09/11] ataflop: fix error handling during setup

[Omar Sandoval]

From: Omar Sandoval <osan...@fb.com>

Move queue allocation next to disk allocation to fix a couple of issues:

- If add_disk() hasn't been called, we should clear disk->queue before
  calling put_disk().
- If we fail to allocate a request queue, we still need to put all of
  the disks, not just the ones that we allocated queues for.

Signed-off-by: Omar Sandoval <osan...@fb.com>
---
 drivers/block/ataflop.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 17df631c5d85..0144d598ac47 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -2014,6 +2014,11 @@ static int __init atari_floppy_init (void)
                unit[i].disk = alloc_disk(1);
                if (!unit[i].disk)
                        goto Enomem;
+
+               unit[i].disk->queue = blk_init_queue(do_fd_request,
+                                                    &ataflop_lock);
+               if (!unit[i].disk->queue)
+                       goto Enomem;
        }
 
        if (UseTrackbuffer < 0)
@@ -2045,10 +2050,6 @@ static int __init atari_floppy_init (void)
                sprintf(unit[i].disk->disk_name, "fd%d", i);
                unit[i].disk->fops = &floppy_fops;
                unit[i].disk->private_data = &unit[i];
-               unit[i].disk->queue = blk_init_queue(do_fd_request,
-                                       &ataflop_lock);
-               if (!unit[i].disk->queue)
-                       goto Enomem;
                set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
                add_disk(unit[i].disk);
        }
@@ -2063,13 +2064,17 @@ static int __init atari_floppy_init (void)
 
        return 0;
 Enomem:
-       while (i--) {
-               struct request_queue *q = unit[i].disk->queue;
+       do {
+               struct gendisk *disk = unit[i].disk;
 
-               put_disk(unit[i].disk);
-               if (q)
-                       blk_cleanup_queue(q);
-       }
+               if (disk) {
+                       if (disk->queue) {
+                               blk_cleanup_queue(disk->queue);
+                               disk->queue = NULL;
+                       }
+                       put_disk(unit[i].disk);
+               }
+       } while (i--);
 
        unregister_blkdev(FLOPPY_MAJOR, "fd");
        return -ENOMEM;
-- 
2.19.1