block: add comment on why we save and disable interrupts in flush_plug_list()

It's done at the top to avoid doing it for every queue we unplug.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index d20ce1e849c8..0c0ea10e61ea 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2696,6 +2696,11 @@ static void flush_plug_list(struct blk_plug *plug)
 
         q = NULL;
         depth = 0;
+
+        /*
+         * Save and disable interrupts here, to avoid doing it for every
+         * queue lock we have to take.
+         */
         local_irq_save(flags);
         while (!list_empty(&list)) {
                 rq = list_entry_rq(list.next);