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authorEd Cashin <ecashin@coraid.com>2009-09-09 14:10:18 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-09-09 14:10:18 +0200
commit7135a71b19be1faf48b7148d77844d03bc0717d6 (patch)
treef1bed8d00c77c90423adc98559247459089c39f5
parente6890f6f3dc2d9024a08b1a149d9bd5208eea350 (diff)
aoe: allocate unused request_queue for sysfs
Andy Whitcroft reported an oops in aoe triggered by use of an incorrectly initialised request_queue object: [ 2645.959090] kobject '<NULL>' (ffff880059ca22c0): tried to add an uninitialized object, something is seriously wrong. [ 2645.959104] Pid: 6, comm: events/0 Not tainted 2.6.31-5-generic #24-Ubuntu [ 2645.959107] Call Trace: [ 2645.959139] [<ffffffff8126ca2f>] kobject_add+0x5f/0x70 [ 2645.959151] [<ffffffff8125b4ab>] blk_register_queue+0x8b/0xf0 [ 2645.959155] [<ffffffff8126043f>] add_disk+0x8f/0x160 [ 2645.959161] [<ffffffffa01673c4>] aoeblk_gdalloc+0x164/0x1c0 [aoe] The request queue of an aoe device is not used but can be allocated in code that does not sleep. Bruno bisected this regression down to cd43e26f071524647e660706b784ebcbefbd2e44 block: Expose stacked device queues in sysfs "This seems to generate /sys/block/$device/queue and its contents for everyone who is using queues, not just for those queues that have a non-NULL queue->request_fn." Addresses http://bugs.launchpad.net/bugs/410198 Addresses http://bugzilla.kernel.org/show_bug.cgi?id=13942 Note that embedding a queue inside another object has always been an illegal construct, since the queues are reference counted and must persist until the last reference is dropped. So aoe was always buggy in this respect (Jens). Signed-off-by: Ed Cashin <ecashin@coraid.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Bruno Premont <bonbons@linux-vserver.org> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--drivers/block/aoe/aoe.h2
-rw-r--r--drivers/block/aoe/aoeblk.c12
-rw-r--r--drivers/block/aoe/aoedev.c1
3 files changed, 11 insertions, 4 deletions
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index 5e41e6dd657b..db195abad698 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -155,7 +155,7 @@ struct aoedev {
u16 fw_ver; /* version of blade's firmware */
struct work_struct work;/* disk create work struct */
struct gendisk *gd;
- struct request_queue blkq;
+ struct request_queue *blkq;
struct hd_geometry geo;
sector_t ssize;
struct timer_list timer;
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 2307a271bdc9..1e15889c4b98 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -264,9 +264,12 @@ aoeblk_gdalloc(void *vp)
goto err_disk;
}
- blk_queue_make_request(&d->blkq, aoeblk_make_request);
- if (bdi_init(&d->blkq.backing_dev_info))
+ d->blkq = blk_alloc_queue(GFP_KERNEL);
+ if (!d->blkq)
goto err_mempool;
+ blk_queue_make_request(d->blkq, aoeblk_make_request);
+ if (bdi_init(&d->blkq->backing_dev_info))
+ goto err_blkq;
spin_lock_irqsave(&d->lock, flags);
gd->major = AOE_MAJOR;
gd->first_minor = d->sysminor * AOE_PARTITIONS;
@@ -276,7 +279,7 @@ aoeblk_gdalloc(void *vp)
snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
d->aoemajor, d->aoeminor);
- gd->queue = &d->blkq;
+ gd->queue = d->blkq;
d->gd = gd;
d->flags &= ~DEVFL_GDALLOC;
d->flags |= DEVFL_UP;
@@ -287,6 +290,9 @@ aoeblk_gdalloc(void *vp)
aoedisk_add_sysfs(d);
return;
+err_blkq:
+ blk_cleanup_queue(d->blkq);
+ d->blkq = NULL;
err_mempool:
mempool_destroy(d->bufpool);
err_disk:
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index eeea477d9601..fa67027789aa 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -113,6 +113,7 @@ aoedev_freedev(struct aoedev *d)
if (d->bufpool)
mempool_destroy(d->bufpool);
skbpoolfree(d);
+ blk_cleanup_queue(d->blkq);
kfree(d);
}