linux-kernel - Re: i2c-HID: Delete unnecessary checks before the function call "gpiod

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Date:	Thu, 9 Jul 2015 23:10:16 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Jiri Kosina <jkosina@...e.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-input <linux-input@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: i2c-HID: Delete unnecessary checks before the function call
 "gpiod_put"

>> The proposed update candidates are contained in the source
>> file "drivers/hid/i2c-hid/i2c-hid.c" from Linux next-20150708.
>>
>> * i2c_hid_remove() function:
>>   Can it be tolerated here that the pointer "ihid->desc" might be eventually null?
>>
>> * i2c_hid_probe() function:
>>   Is this implementation structured in such a way that a pointer for valid data
>>   will be usually passed for "ihid->desc" if the statements after the jump
>>   label "err" will be reached?
>>
> 
> Again, in both case it is completely normal to have "ihid->desc ==
> NULL" given that this field is only retrieved in case of an ACPI
> device which does not declares an IRQ but a GPIO. Most ACPI devices I
> saw are using a simple IRQ, and the OF instantiations of the driver
> will definitively have ihid->desc null. So I do not want to have a
> warning for most of i2c-hid devices out there (because I will have to
> explain that this is completely normal again and again).

Would it make sense to annotate checks before such function calls
as "unlikely" then?

Regards,
Markus
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