linux-kernel - Re: [PATCH] ACPI / IPMI: change warning to debug on timeout

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Date:   Sat, 25 Mar 2017 10:08:59 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     minyard@....org, linux-acpi@...r.kernel.org, timur@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI / IPMI: change warning to debug on timeout

On 3/24/2017 10:55 PM, Corey Minyard wrote:
> Why would a timeout for a message be expected?  The BMC should
> at least respond with an error for an incorrect message.

Let me add some more context...

In this particular case, the FRU ID that I was trying to access was
correct. 

Platform supports PCIe hotplug. The FRU is embedded into the HW that
is being removed. That's what I mean by non-existent.

When the device is ejected and a FRU command is executed, BMC times out
reaching to the FRU on the device. 

When the device is inserted, everything works as expected.

> 
> -corey
> 
> On 03/23/2017 10:32 AM, Sinan Kaya wrote:
>> Getting timeout message from BMC when trying to read from a non-existent
>> FRU. This is expected but warning is not.
>>
>> Let's reduce the warning to debug.
>>
>> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
>> ---
>>   drivers/acpi/acpi_ipmi.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/acpi/acpi_ipmi.c b/drivers/acpi/acpi_ipmi.c
>> index 747c2ba..1b64419 100644
>> --- a/drivers/acpi/acpi_ipmi.c
>> +++ b/drivers/acpi/acpi_ipmi.c
>> @@ -429,8 +429,7 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
>>       if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE &&
>>           msg->msg.data_len == 1) {
>>           if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) {
>> -            dev_WARN_ONCE(dev, true,
>> -                      "Unexpected response (timeout).\n");
>> +            dev_dbg_once(dev, "Unexpected response (timeout).\n");
>>               tx_msg->msg_done = ACPI_IPMI_TIMEOUT;
>>           }
>>           goto out_comp;
> 
> 
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.