linux-kernel - [PATCH 0/2] ipmi: fix timeout calculation when bmc is disconnected

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Date:	Fri, 13 Dec 2013 10:36:36 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	Corey Minyard <minyard@....org>
CC:	Hushiyuan <hushiyuan@...wei.com>,
	<openipmi-developer@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Zhangdianfang <zhangdianfang@...wei.com>
Subject: [PATCH 0/2] ipmi: fix timeout calculation when bmc is disconnected

Hu Shiyuan report, when loading ipmi_si module while bmc is
disconnected, we found the timeout is longer than 5 secs.
Actually it takes about 3 mins and 20 secs (HZ=250).

error message as below:
Dec 12 19:08:59 linux kernel: IPMI BT: timeout in RD_WAIT [ ] 1 retries left
Dec 12 19:08:59 linux kernel: BT: write 4 bytes seq=0x01 03 18 00 01
[...]
Dec 12 19:12:19 linux kernel: IPMI BT: timeout in RD_WAIT [ ]
Dec 12 19:12:19 linux kernel: failed 2 retries, sending error response
Dec 12 19:12:19 linux kernel: IPMI: BT reset (takes 5 secs)
Dec 12 19:12:19 linux kernel: IPMI BT: flag reset [ ]

Function wait_for_msg_done() use schedule_timeout_uninterruptible(1)
to sleep 1 tick, so we should subtract jiffies_to_usecs(1) usecs
instead of 100 usecs from timeout.

For more clearly, I used USEC_PER_SEC instead of 1000000.

Xie XiuQi (2):
  ipmi: use USEC_PER_SEC instead of 1000000 for more meaningful
  ipmi: fix timeout calculation when bmc is disconnected

 drivers/char/ipmi/ipmi_bt_sm.c   | 8 ++++----
 drivers/char/ipmi/ipmi_kcs_sm.c  | 4 ++--
 drivers/char/ipmi/ipmi_si_intf.c | 2 +-
 drivers/char/ipmi/ipmi_smic_sm.c | 2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

-- 
1.8.2.2


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