1 files changed, 25 insertions, 14 deletions

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 062067fa7ead..5b26af8597f3 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -785,6 +785,8 @@ void blk_queue_stack_limits(request_queue_t *t, request_queue_t *b)
         t->max_hw_segments = min(t->max_hw_segments,b->max_hw_segments);
         t->max_segment_size = min(t->max_segment_size,b->max_segment_size);
         t->hardsect_size = max(t->hardsect_size,b->hardsect_size);
+        if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags))
+                clear_bit(QUEUE_FLAG_CLUSTER, &t->queue_flags);
 }
 
 EXPORT_SYMBOL(blk_queue_stack_limits);
@@ -906,17 +908,15 @@ init_tag_map(request_queue_t *q, struct blk_queue_tag *tags, int depth)
                                 __FUNCTION__, depth);
         }
 
-        tag_index = kmalloc(depth * sizeof(struct request *), GFP_ATOMIC);
+        tag_index = kzalloc(depth * sizeof(struct request *), GFP_ATOMIC);
         if (!tag_index)
                 goto fail;
 
         nr_ulongs = ALIGN(depth, BITS_PER_LONG) / BITS_PER_LONG;
-        tag_map = kmalloc(nr_ulongs * sizeof(unsigned long), GFP_ATOMIC);
+        tag_map = kzalloc(nr_ulongs * sizeof(unsigned long), GFP_ATOMIC);
         if (!tag_map)
                 goto fail;
 
-        memset(tag_index, 0, depth * sizeof(struct request *));
-        memset(tag_map, 0, nr_ulongs * sizeof(unsigned long));
         tags->real_max_depth = depth;
         tags->max_depth = depth;
         tags->tag_index = tag_index;
@@ -2479,10 +2479,12 @@ void blk_execute_rq_nowait(request_queue_t *q, struct gendisk *bd_disk,
         rq->rq_disk = bd_disk;
         rq->flags |= REQ_NOMERGE;
         rq->end_io = done;
-        elv_add_request(q, rq, where, 1);
-        generic_unplug_device(q);
+        WARN_ON(irqs_disabled());
+        spin_lock_irq(q->queue_lock);
+        __elv_add_request(q, rq, where, 1);
+        __generic_unplug_device(q);
+        spin_unlock_irq(q->queue_lock);
 }
-
 EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
 
 /**
@@ -3512,7 +3514,7 @@ int __init blk_dev_init(void)
         iocontext_cachep = kmem_cache_create("blkdev_ioc",
                         sizeof(struct io_context), 0, SLAB_PANIC, NULL, NULL);
 
-        for_each_cpu(i)
+        for_each_possible_cpu(i)
                 INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i));
 
         open_softirq(BLOCK_SOFTIRQ, blk_done_softirq, NULL);
@@ -3537,11 +3539,17 @@ void put_io_context(struct io_context *ioc)
         BUG_ON(atomic_read(&ioc->refcount) == 0);
 
         if (atomic_dec_and_test(&ioc->refcount)) {
+                struct cfq_io_context *cic;
+
                 rcu_read_lock();
                 if (ioc->aic && ioc->aic->dtor)
                         ioc->aic->dtor(ioc->aic);
-                if (ioc->cic && ioc->cic->dtor)
-                        ioc->cic->dtor(ioc->cic);
+                if (ioc->cic_root.rb_node != NULL) {
+                        struct rb_node *n = rb_first(&ioc->cic_root);
+
+                        cic = rb_entry(n, struct cfq_io_context, rb_node);
+                        cic->dtor(ioc);
+                }
                 rcu_read_unlock();
 
                 kmem_cache_free(iocontext_cachep, ioc);
@@ -3554,6 +3562,7 @@ void exit_io_context(void)
 {
         unsigned long flags;
         struct io_context *ioc;
+        struct cfq_io_context *cic;
 
         local_irq_save(flags);
         task_lock(current);
@@ -3565,9 +3574,11 @@ void exit_io_context(void)
 
         if (ioc->aic && ioc->aic->exit)
                 ioc->aic->exit(ioc->aic);
-        if (ioc->cic && ioc->cic->exit)
-                ioc->cic->exit(ioc->cic);
-
+        if (ioc->cic_root.rb_node != NULL) {
+                cic = rb_entry(rb_first(&ioc->cic_root), struct cfq_io_context, rb_node);
+                cic->exit(ioc);
+        }
+ 
         put_io_context(ioc);
 }
 
@@ -3596,7 +3607,7 @@ struct io_context *current_io_context(gfp_t gfp_flags)
                 ret->last_waited = jiffies; /* doesn't matter... */
                 ret->nr_batch_requests = 0; /* because this is 0 */
                 ret->aic = NULL;
-                ret->cic = NULL;
+                ret->cic_root.rb_node = NULL;
                 tsk->io_context = ret;
         }