Commit 18811272 authored by Jens Axboe's avatar Jens Axboe

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: default avatarJens Axboe <jaxboe@fusionio.com>
parent 94b5eb28
...@@ -2696,6 +2696,11 @@ static void flush_plug_list(struct blk_plug *plug) ...@@ -2696,6 +2696,11 @@ static void flush_plug_list(struct blk_plug *plug)
q = NULL; q = NULL;
depth = 0; depth = 0;
/*
* Save and disable interrupts here, to avoid doing it for every
* queue lock we have to take.
*/
local_irq_save(flags); local_irq_save(flags);
while (!list_empty(&list)) { while (!list_empty(&list)) {
rq = list_entry_rq(list.next); rq = list_entry_rq(list.next);
......
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