block: ensure jiffies wrap is handled correctly in blk_rq_timed_out_timer

[safe/jmp/linux-2.6] / block / blk-timeout.c

diff --git a/block/blk-timeout.c b/block/blk-timeout.c
index 1ba7e0a..4f0c06c 100644 (file)
--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -109,6 +109,7 @@ void blk_rq_timed_out_timer(unsigned long data)
        struct request_queue *q = (struct request_queue *) data;
        unsigned long flags, next = 0;
        struct request *rq, *tmp;
+       int next_set = 0;
 
        spin_lock_irqsave(q->queue_lock, flags);
 
@@ -122,16 +123,13 @@ void blk_rq_timed_out_timer(unsigned long data)
                        if (blk_mark_rq_complete(rq))
                                continue;
                        blk_rq_timed_out(rq);
-               } else if (!next || time_after(next, rq->deadline))
+               } else if (!next_set || time_after(next, rq->deadline)) {
                        next = rq->deadline;
+                       next_set = 1;
+               }
        }
 
-       /*
-        * next can never be 0 here with the list non-empty, since we always
-        * bump ->deadline to 1 so we can detect if the timer was ever added
-        * or not. See comment in blk_add_timer()
-        */
-       if (next)
+       if (next_set)
                mod_timer(&q->timeout, round_jiffies_up(next));
 
        spin_unlock_irqrestore(q->queue_lock, flags);