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| author | Arnd Bergmann <arnd@arndb.de> | 2011-07-21 16:31:22 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2011-07-21 16:31:22 +0200 |
| commit | ab2a0e0d135490729e384c1826d118f92e88cae8 (patch) | |
| tree | 58ab1e9e5d549feac9bf3beacbb6942f50d0bed9 /block/cfq-iosched.c | |
| parent | 09dd9b39abf85b8fae3ea105a81825478dd227b6 (diff) | |
| parent | 2f3ab04a47c9b5e7c93400601e8f69bef0fa184a (diff) | |
Merge branch 'next-samsung-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/cleanup
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index f3799432676..ae21919f15e 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -2773,11 +2773,14 @@ static void __cfq_exit_single_io_context(struct cfq_data *cfqd, smp_wmb(); cic->key = cfqd_dead_key(cfqd); + rcu_read_lock(); if (rcu_dereference(ioc->ioc_data) == cic) { + rcu_read_unlock(); spin_lock(&ioc->lock); rcu_assign_pointer(ioc->ioc_data, NULL); spin_unlock(&ioc->lock); - } + } else + rcu_read_unlock(); if (cic->cfqq[BLK_RW_ASYNC]) { cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_ASYNC]); @@ -3084,7 +3087,8 @@ cfq_drop_dead_cic(struct cfq_data *cfqd, struct io_context *ioc, spin_lock_irqsave(&ioc->lock, flags); - BUG_ON(ioc->ioc_data == cic); + BUG_ON(rcu_dereference_check(ioc->ioc_data, + lockdep_is_held(&ioc->lock)) == cic); radix_tree_delete(&ioc->radix_root, cfqd->cic_index); hlist_del_rcu(&cic->cic_list); |