add __blk_stop_queue() as locked variant of blk_stop_queue() and

make cpqarray and cciss use these

drivers/block/cciss.c

@@ -1863,7 +1863,7 @@ static void do_cciss_request(request_queue_t *q)
 
 	goto queue;
 startio:
-	blk_stop_queue(q);
+	__blk_stop_queue(q);
 	start_io(h);
 }
 

drivers/block/cpqarray.c

@@ -918,7 +918,7 @@ DBGPX(	printk("Submitting %d sectors in %d segments\n", creq->nr_sectors, seg);
 	goto queue_next;
 
 startio:
-	blk_stop_queue(q);
+	__blk_stop_queue(q);
 	start_io(h);
 }
 

drivers/block/ll_rw_blk.c

@@ -900,7 +900,8 @@ void generic_unplug_device(void *data)
  * Description:
  *   blk_start_queue() will clear the stop flag on the queue, and call
  *   the request_fn for the queue if it was in a stopped state when
- *   entered. Also see blk_stop_queue()
+ *   entered. Also see blk_stop_queue(). Must not be called from driver
+ *   request function due to recursion issues.
  **/
 void blk_start_queue(request_queue_t *q)
 {
@@ -914,6 +915,18 @@ void blk_start_queue(request_queue_t *q)
 	}
 }
 
+/**
+ * __blk_stop_queue: see blk_stop_queue()
+ *
+ * Description:
+ *  Like blk_stop_queue(), bust queue_lock must be held
+ **/
+void __blk_stop_queue(request_queue_t *q)
+{
+	blk_remove_plug(q);
+	set_bit(QUEUE_FLAG_STOPPED, &q->queue_flags);
+}
+
 /**
  * blk_stop_queue - stop a queue
  * @q:    The &request_queue_t in question
@@ -933,10 +946,8 @@ void blk_stop_queue(request_queue_t *q)
 	unsigned long flags;
 
 	spin_lock_irqsave(q->queue_lock, flags);
-	blk_remove_plug(q);
+	__blk_stop_queue(q);
 	spin_unlock_irqrestore(q->queue_lock, flags);
-
-	set_bit(QUEUE_FLAG_STOPPED, &q->queue_flags);
 }
 
 /**
@@ -2089,4 +2100,5 @@ EXPORT_SYMBOL(blk_queue_invalidate_tags);
 
 EXPORT_SYMBOL(blk_start_queue);
 EXPORT_SYMBOL(blk_stop_queue);
+EXPORT_SYMBOL(__blk_stop_queue);
 EXPORT_SYMBOL(blk_run_queues);

include/linux/blkdev.h

@@ -295,6 +295,7 @@ extern inline int blk_hw_contig_segment(request_queue_t *q, struct bio *, struct
 extern int block_ioctl(struct block_device *, unsigned int, unsigned long);
 extern void blk_start_queue(request_queue_t *q);
 extern void blk_stop_queue(request_queue_t *q);
+extern void __blk_stop_queue(request_queue_t *q);
 
 /*
  * get ready for proper ref counting