linux-kernel - [PATCH 1/9] aoe: describe the behavior of the "err" character device

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Message-Id: <f088078c2c4c8a1ab6a7585c8f743a035ab6ac19.1350524227.git.ecashin@coraid.com>
Date:	Wed, 17 Oct 2012 18:43:30 -0700
From:	Ed Cashin <ecashin@...aid.com>
To:	akpm@...ux-foundation.org
Cc:	ecashin@...aid.com, linux-kernel@...r.kernel.org
Subject: [PATCH 1/9] aoe: describe the behavior of the "err" character device

Signed-off-by: Ed Cashin <ecashin@...aid.com>
---
 drivers/block/aoe/aoechr.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index ed57a89..2bf6273 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;
-- 
1.7.1

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