From: Ed Cashin <ecashin@coraid.com>
Date: Sat, 3 Nov 2012 00:43:08 +0000 (+1100)
Subject: aoe: describe the behavior of the "err" character device
X-Git-Tag: next-20121108~1^2~12
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=33473e611fb2bc345e1311c1d99d49d1bd0be3c3;p=karo-tx-linux.git

aoe: describe the behavior of the "err" character device

Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index ed57a890c643..2bf6273e6779 100644
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -39,6 +39,11 @@ struct ErrMsg {
 };
 
 static DEFINE_MUTEX(aoechr_mutex);
+
+/* A ring buffer of error messages, to be read through
+ * "/dev/etherd/err".  When no messages are present,
+ * readers will block waiting for messages to appear.
+ */
 static struct ErrMsg emsgs[NMSG];
 static int emsgs_head_idx, emsgs_tail_idx;
 static struct completion emsgs_comp;