From 0820a062a919c24a148b69d2cb675fc2a36a9ff7 Mon Sep 17 00:00:00 2001 From: Ed L. Cashin Date: Fri, 4 Sep 2009 15:27:35 -0400 Subject: [PATCH] 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 '' (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] [] kobject_add+0x5f/0x70 [ 2645.959151] [] blk_register_queue+0x8b/0xf0 [ 2645.959155] [] add_disk+0x8f/0x160 [ 2645.959161] [] 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 Signed-off-by: Ed Cashin Cc: Andy Whitcroft Cc: "Rafael J. Wysocki" Cc: Bruno Premont Cc: Martin K. Petersen Cc: Jens Axboe Cc: Andrew Morton --- drivers/block/aoe/aoe.h | 2 +- drivers/block/aoe/aoeblk.c | 12 +++++++++--- drivers/block/aoe/aoedev.c | 1 + 3 files changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index 5e41e6d..db195ab 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 2307a27..1e15889 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 eeea477..fa67027 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); } -- 1.5.6.5