[PATCH] ub: atomic add_disk

<zaitcev> I am taling about this: "if (disk->flags & GENHD_FL_UP) del_gendisk(disk);"
<zaitcev> If del_gendisk() undoes add_disk() like viro just said, why is it conditional?
<viro> huh?
<viro> add_disk() sets the damn flag
<zaitcev> So, I should not need to check ever
<viro> so the above is "if I've called add_disk(), call gendisk()"
<viro> which might be what you want, of course
<viro> but usually you know if you'd done add_disk() on that puppy anyway

In ub, nobody upstream should ever see half-constructed disks before
they were passed to add_disk. To that end, only add the struct lun to
the list on the path of no return. With that fix in place, we do
not need to test GENHD_FL_UP.

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 8eb44a55b9b8..cfb824d90c86 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -2314,7 +2314,6 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
                 goto err_id;
 
         lun->udev = sc;
-        list_add(&lun->link, &sc->luns);
 
         snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)",
             lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num);
@@ -2327,7 +2326,6 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
         if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL)
                 goto err_diskalloc;
 
-        lun->disk = disk;
         sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a');
         sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a');
         disk->major = UB_MAJOR;
@@ -2349,7 +2347,9 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
         blk_queue_max_sectors(q, UB_MAX_SECTORS);
         blk_queue_hardsect_size(q, lun->capacity.bsize);
 
+        lun->disk = disk;
         q->queuedata = lun;
+        list_add(&lun->link, &sc->luns);
 
         set_capacity(disk, lun->capacity.nsec);
         if (lun->removable)
@@ -2362,7 +2362,6 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
 err_blkqinit:
         put_disk(disk);
 err_diskalloc:
-        list_del(&lun->link);
         ub_id_put(lun->id);
 err_id:
         kfree(lun);
@@ -2375,7 +2374,6 @@ static void ub_disconnect(struct usb_interface *intf)
         struct ub_dev *sc = usb_get_intfdata(intf);
         struct list_head *p;
         struct ub_lun *lun;
-        struct gendisk *disk;
         unsigned long flags;
 
         /*
@@ -2431,9 +2429,7 @@ static void ub_disconnect(struct usb_interface *intf)
          */
         list_for_each (p, &sc->luns) {
                 lun = list_entry(p, struct ub_lun, link);
-                disk = lun->disk;
-                if (disk->flags & GENHD_FL_UP)
-                        del_gendisk(disk);
+                del_gendisk(lun->disk);
                 /*
                  * I wish I could do:
                  *    set_bit(QUEUE_FLAG_DEAD, &q->queue_flags);