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authorPete Zaitcev <zaitcev@redhat.com>2006-05-25 20:04:54 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-21 15:04:14 -0700
commit688e9fb1bbdd4e5a51b5030b7f9b1c811fd5e5e3 (patch)
tree302c191611e780f3e897d353b134f1fe3c9394bc /drivers/block/ub.c
parent2f8ad9a1b91bc6856860a2fea8b07e0c82c0ad0a (diff)
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[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>
Diffstat (limited to 'drivers/block/ub.c')
-rw-r--r--drivers/block/ub.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 8eb44a5..cfb824d 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);