From: Jens Axboe <jaxboe@fusionio.com>
Date: Tue, 12 Apr 2011 08:11:24 +0000 (+0200)
Subject: block: add comment on why we save and disable interrupts in flush_plug_list()
X-Git-Tag: v2.6.39-rc4~22^2~7
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=188112722cce083c8f1a7d0d84f55c2cd885920c;p=~emulex%2Finfiniband.git

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>
---

diff --git a/block/blk-core.c b/block/blk-core.c
index d20ce1e849c..0c0ea10e61e 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);