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| author | James Bottomley <JBottomley@Parallels.com> | 2011-07-23 21:09:03 +0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2011-07-23 21:09:03 +0400 |
| commit | 87045b033a62777337ae4aa62834876da09b5fb5 (patch) | |
| tree | 26aefd28e436668ff906e42b1e0d75c056e33e01 /block | |
| parent | 0d83ab65ff1b54ce8b6cd172285cf71a38c4cceb (diff) | |
| parent | bfe159a51203c15d23cb3158fffdc25ec4b4dda1 (diff) | |
| download | linux-stable-87045b033a62777337ae4aa62834876da09b5fb5.tar.gz linux-stable-87045b033a62777337ae4aa62834876da09b5fb5.tar.bz2 linux-stable-87045b033a62777337ae4aa62834876da09b5fb5.zip | |
Merge branch 'scsi-fixes'
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 3 | ||||
| -rw-r--r-- | block/blk-exec.c | 7 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 8 |
3 files changed, 16 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index d2f8f4049abd..1d49e1c7c905 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -839,6 +839,9 @@ struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask) { struct request *rq; + if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) + return NULL; + BUG_ON(rw != READ && rw != WRITE); spin_lock_irq(q->queue_lock); diff --git a/block/blk-exec.c b/block/blk-exec.c index 8a0e7ec056e7..a1ebceb332f9 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -50,6 +50,13 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, { int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK; + if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) { + rq->errors = -ENXIO; + if (rq->end_io) + rq->end_io(rq, rq->errors); + return; + } + rq->rq_disk = bd_disk; rq->end_io = done; WARN_ON(irqs_disabled()); 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); |