linux-kernel - Re: [PATCH] of: Make of_node_name

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Date:   Thu, 24 Jan 2019 17:20:07 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Frank Rowand <frowand.list@...il.com>, linux-kernel@...r.kernel.org
Cc:     vivien.didelot@...il.com, Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH] of: Make of_node_name_eq() case insensitive



On 1/24/19 3:45 PM, Frank Rowand wrote:
> On 1/24/19 12:08 PM, Florian Fainelli wrote:
>> Since c32569e358ad ("regulator: Use of_node_name_eq for node name
>> comparisons") Vivien reported the mc13892-regulator complaining about
>> not being able to find regulators.
>>
>> This is because prior to that commit we used of_node_cmp() to compare
>> the regulator array passed from mc13892_regulators down to
>> mc13xxx_parse_regulators_dt() and they are all defined in uppercase
>> letters by the MC13892_*_DEFINE* macros, whereas they are defined as
>> lowercase in the DTS.
>>
>> Fix this by use strncasecmp() since that makes sure the comparison is
>> case insensitive like what of_node_cmp() did.
>>
>> Reported-by: Vivien Didelot <vivien.didelot@...il.com>
>> Fixes: c32569e358ad ("regulator: Use of_node_name_eq for node name comparisons")
>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
>> ---
>>  drivers/of/base.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/of/base.c b/drivers/of/base.c
>> index 5226e898476e..ff47c86277cb 100644
>> --- a/drivers/of/base.c
>> +++ b/drivers/of/base.c
>> @@ -66,7 +66,8 @@ bool of_node_name_eq(const struct device_node *np, const char *name)
>>  	node_name = kbasename(np->full_name);
>>  	len = strchrnul(node_name, '@') - node_name;
>>  
>> -	return (strlen(name) == len) && (strncmp(node_name, name, len) == 0);
>> +	return (strlen(name) == len) &&
>> +		(strncasecmp(node_name, name, len) == 0);
>>  }
>>  EXPORT_SYMBOL(of_node_name_eq);
>>  
>>
> 
> Node names are case sensitive.  Please fix mc13xxx_parse_regulators_dt() to
> properly handle case instead of changing of_node_name_eq().

Fair enough, should we issue a warning if np->full_name contains upper
case while name does not (and vice versa) to help troubleshoot cases
like the one we found with Vivien?
-- 
Florian