From d7790b928d42597b7da21a4e43080774903e3b5c Mon Sep 17 00:00:00 2001 From: Shlomo Pongratz Date: Thu, 6 Feb 2014 18:33:17 +0200 Subject: [PATCH] block/null_blk: Fix completion processing from LIFO to FIFO The completion queue is implemented using lockless list. The llist_add is adds the events to the list head which is a push operation. The processing of the completion elements is done by disconnecting all the pushed elements and iterating over the disconnected list. The problem is that the processing is done in reverse order w.r.t order of the insertion i.e. LIFO processing. By reversing the disconnected list which is done in linear time the desired FIFO processing is achieved. Signed-off-by: Shlomo Pongratz Signed-off-by: Jens Axboe --- drivers/block/null_blk.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 3107282a9741..cc801cde5cfa 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -195,6 +195,7 @@ static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) cq = &per_cpu(completion_queues, smp_processor_id()); while ((entry = llist_del_all(&cq->list)) != NULL) { + entry = llist_reverse_order(entry); do { cmd = container_of(entry, struct nullb_cmd, ll_list); end_cmd(cmd); @@ -235,6 +236,7 @@ static void null_ipi_cmd_end_io(void *data) cq = &per_cpu(completion_queues, smp_processor_id()); entry = llist_del_all(&cq->list); + entry = llist_reverse_order(entry); while (entry) { next = entry->next;