Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 07/17] blkcg: make blkio_list_lock irq-safe | Date | Sat, 21 Jan 2012 19:25:15 -0800 |
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Scheduled blkcg API cleanup requires nesting queue lock under blkio_list_lock. Make it irq-safe.
Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> --- block/blk-cgroup.c | 28 ++++++++++++++-------------- 1 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 7bfc574..cbaad8c 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -1046,8 +1046,8 @@ static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, struct blkio_group *blkg; struct hlist_node *n; - spin_lock(&blkio_list_lock); - spin_lock_irq(&blkcg->lock); + spin_lock_irq(&blkio_list_lock); + spin_lock(&blkcg->lock); hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { if (pn->dev != blkg->dev || pn->plid != blkg->plid) @@ -1055,8 +1055,8 @@ static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, blkio_update_blkg_policy(blkcg, blkg, pn); } - spin_unlock_irq(&blkcg->lock); - spin_unlock(&blkio_list_lock); + spin_unlock(&blkcg->lock); + spin_unlock_irq(&blkio_list_lock); } static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, @@ -1321,8 +1321,8 @@ static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) return -EINVAL; - spin_lock(&blkio_list_lock); - spin_lock_irq(&blkcg->lock); + spin_lock_irq(&blkio_list_lock); + spin_lock(&blkcg->lock); blkcg->weight = (unsigned int)val; hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { @@ -1333,8 +1333,8 @@ static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) blkio_update_group_weight(blkg, blkcg->weight); } - spin_unlock_irq(&blkcg->lock); - spin_unlock(&blkio_list_lock); + spin_unlock(&blkcg->lock); + spin_unlock_irq(&blkio_list_lock); return 0; } @@ -1575,13 +1575,13 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) * going away. Let all the IO controlling policies know about * this event. */ - spin_lock(&blkio_list_lock); + spin_lock_irqsave(&blkio_list_lock, flags); list_for_each_entry(blkiop, &blkio_list, list) { if (blkiop->plid != blkg->plid) continue; blkiop->ops.blkio_unlink_group_fn(key, blkg); } - spin_unlock(&blkio_list_lock); + spin_unlock_irqrestore(&blkio_list_lock, flags); } while (1); list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) { @@ -1663,16 +1663,16 @@ static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, void blkio_policy_register(struct blkio_policy_type *blkiop) { - spin_lock(&blkio_list_lock); + spin_lock_irq(&blkio_list_lock); list_add_tail(&blkiop->list, &blkio_list); - spin_unlock(&blkio_list_lock); + spin_unlock_irq(&blkio_list_lock); } EXPORT_SYMBOL_GPL(blkio_policy_register); void blkio_policy_unregister(struct blkio_policy_type *blkiop) { - spin_lock(&blkio_list_lock); + spin_lock_irq(&blkio_list_lock); list_del_init(&blkiop->list); - spin_unlock(&blkio_list_lock); + spin_unlock_irq(&blkio_list_lock); } EXPORT_SYMBOL_GPL(blkio_policy_unregister); -- 1.7.7.3
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