diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-15 10:06:42 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-15 10:06:42 +0100 |
| commit | 4aa96ccf9ee35cdbd0d423e87a4d551019570218 (patch) | |
| tree | dca6322681df2e8f33f65c07defce24db68f645c /block/cfq-iosched.c | |
| parent | cb5fd904f0f14866ab76ec1f6ca3469896e4e2cf (diff) | |
| parent | 8f2ffa00fb3c05ec0659cd7b056c4e8e106072f1 (diff) | |
| download | blackbird-op-linux-4aa96ccf9ee35cdbd0d423e87a4d551019570218.tar.gz blackbird-op-linux-4aa96ccf9ee35cdbd0d423e87a4d551019570218.zip | |
Merge branch 'kprobes-thumb' of git://git.yxit.co.uk/linux into devel-stable
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 f3799432676d..ae21919f15e1 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); |
