linux-kernel - Re:Re: [PATCH] of: irq: Add a helper function for irq_of_parse_and

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Date:   Tue, 24 Jul 2018 21:19:20 +0800 (CST)
From:   liuxiang <liuxiang_1999@....com>
To:     "Rob Herring" <robh+dt@...nel.org>
Cc:     liu.xiang6@....com.cn, "Frank Rowand" <frowand.list@...il.com>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re:Re: [PATCH] of: irq: Add a helper function for
 irq_of_parse_and_map


I found in probe function some drivers use irq_of_parse_and_map
and do not call irq_dispose_mapping in err path, while other drivers do.
So I think a resource managed irq_of_parse_and_map function can 
be better to finish this job.

At 2018-07-23 23:28:52, "Rob Herring" <robh+dt@...nel.org> wrote:
>On Sat, Jul 21, 2018 at 9:38 AM Liu Xiang <liu.xiang6@....com.cn> wrote:
>>
>> Implement a resource managed irq_of_parse_and_map function.
>
>That is obvious from the diff. Why do you need this?
>
>Anything that is a platform device should use platform_get_irq. The
>mapping is created by the core Also, of_irq_get() is preferred over
>irq_of_parse_and_map() for new users as it has better error return
>handling.
>
>>
>> Signed-off-by: Liu Xiang <liu.xiang6@....com.cn>
>> ---
>>  drivers/of/irq.c       | 38 ++++++++++++++++++++++++++++++++++++++
>>  include/linux/of_irq.h |  7 +++++++
>>  2 files changed, 45 insertions(+)
>>
>> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
>> index 02ad93a..947fe41 100644
>> --- a/drivers/of/irq.c
>> +++ b/drivers/of/irq.c
>> @@ -45,6 +45,44 @@ unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
>>  }
>>  EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
>>
>> +static void devm_irq_dispose_mapping(struct device *dev, void *res)
>> +{
>> +       irq_dispose_mapping(*(unsigned int *)res);
>
>We don't ref count creating mappings, so this would break for any shared irq.
>
>Rob