linux-kernel - Re: [PATCH v2 net-next 2/5] net: ipa: don't report EPROBE

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Date:   Thu, 11 Feb 2021 16:13:10 -0600
From:   Alex Elder <elder@...aro.org>
To:     Heiner Kallweit <hkallweit1@...il.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     elder@...nel.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next 2/5] net: ipa: don't report EPROBE_DEFER error

On 2/11/21 4:11 PM, Heiner Kallweit wrote:
> On 11.02.2021 22:19, Alex Elder wrote:
>> When initializing the IPA core clock and interconnects, it's
>> possible we'll get an EPROBE_DEFER error.  This isn't really an
>> error, it's just means we need to be re-probed later.
>>
>> Check the return code when initializing these, and if it's
>> EPROBE_DEFER, skip printing the error message.
>>
>> Signed-off-by: Alex Elder <elder@...aro.org>
>> ---
>>   drivers/net/ipa/ipa_clock.c | 12 ++++++++----
>>   1 file changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ipa/ipa_clock.c b/drivers/net/ipa/ipa_clock.c
>> index 354675a643db5..238a713f6b604 100644
>> --- a/drivers/net/ipa/ipa_clock.c
>> +++ b/drivers/net/ipa/ipa_clock.c
>> @@ -1,7 +1,7 @@
>>   // SPDX-License-Identifier: GPL-2.0
>>   
>>   /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
>> - * Copyright (C) 2018-2020 Linaro Ltd.
>> + * Copyright (C) 2018-2021 Linaro Ltd.
>>    */
>>   
>>   #include <linux/refcount.h>
>> @@ -68,8 +68,9 @@ static int ipa_interconnect_init_one(struct device *dev,
>>   	if (IS_ERR(path)) {
>>   		int ret = PTR_ERR(path);
>>   
>> -		dev_err(dev, "error %d getting %s interconnect\n", ret,
>> -			data->name);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "error %d getting %s interconnect\n", ret,
>> +				data->name);
>>   
> 
> You may want to use dev_err_probe() here.

Great suggestion, I haven't used that before.

I will post v3 with that suggested change,
tomorrow morning.

Thanks!

					-Alex

>>   		return ret;
>>   	}
>> @@ -281,7 +282,10 @@ ipa_clock_init(struct device *dev, const struct ipa_clock_data *data)
>>   
>>   	clk = clk_get(dev, "core");
>>   	if (IS_ERR(clk)) {
>> -		dev_err(dev, "error %ld getting core clock\n", PTR_ERR(clk));
>> +		ret = PTR_ERR(clk);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "error %d getting core clock\n", ret);
>> +
>>   		return ERR_CAST(clk);
>>   	}
>>   
>>
>