linux-kernel - Re: [RFC PATCH v0] Add tw5864 driver

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Date:	Sun, 3 Jan 2016 15:34:33 +0200
From:	Andrey Utkin <andrey.utkin@...p.bluecherry.net>
To:	Joe Perches <joe@...ches.com>
Cc:	Linux Media <linux-media@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-mentors@...enic.com" <kernel-mentors@...enic.com>,
	devel@...verdev.osuosl.org,
	kernel-janitors <kernel-janitors@...r.kernel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrey Utkin <andrey.od.utkin@...il.com>
Subject: Re: [RFC PATCH v0] Add tw5864 driver

On Sun, Jan 3, 2016 at 5:47 AM, Joe Perches <joe@...ches.com> wrote:
> several of these have unnecessary parentheses

Thanks, fixed.

> Maybe use bool a bit more

Thanks, fixed.

> or maybe just use fls

Thanks, fls() fit greatly, rewritten the function with compatibility testing.

>> +static inline int bs_size_ue(unsigned int val)
>> +{
>> +     int i_size = 0;
>> +     static const int i_size0_254[255] = {
>
> Same sort of thing

Dropped this procedure because it is not used.
Thanks.

>> diff --git a/drivers/staging/media/tw5864/tw5864-config.c b/drivers/staging/media/tw5864/tw5864-config.c
> []
>> +u8 tw_indir_readb(struct tw5864_dev *dev, u16 addr)
>> +{
>> +     int timeout = 30000;
>
> misleading name, retries would be more proper,
> or maybe use real timed loops.

Thanks, renamed to "retries".

> This seems a little repetitive.

Thanks, reworked.

> u16?

Thanks, fixed.

> odd indentation

Indeed. For some mysterious reason, vim + syntastic insists on this way. Fixed.

>> +#ifdef DEBUG
>> +     dev_dbg(&input->root->pci->dev,
>> +             "input %d, frame md stats: min %u, max %u, avg %u, cells above threshold: %u\n",
>> +             input->input_number, min, max, sum / md_cells,
>> +             cnt_above_thresh);
>> +#endif
>
> unnecessary #ifdef

Not quite. This debug printout works with variables which are declared
in another "#ifdef DEBUG" clause. And it turns out that dev_dbg is
compiled not only if DEBUG is declared, so when I remove this ifdef, I
get "undefined variable" errors. It seems it is compiled if this
condition is met:

#if (defined DEBUG) || (defined CONFIG_DYNAMIC_DEBUG)

so I can wrap my stats variables into this statement instead. But such
change is not equivalent - I guess CONFIG_DYNAMIC_DEBUG is common to
be enabled, so debug stats will be always calculated, even when module
is not under debug. Except if I use DEFINE_DYNAMIC_DEBUG_METADATA etc.
in my code. Please let me know if this can be sorted out in cleaner
way.

On Sun, Jan 3, 2016 at 7:38 AM, Leon Romanovsky <leon@...n.nu> wrote:
> On Sun, Jan 03, 2016 at 03:41:42AM +0200, Andrey Utkin wrote:
> ....
>> +/*
>> + *  TW5864 driver - Exp-Golomb code functions
>> + *
>> + *  Copyright (C) 2015 Bluecherry, LLC <maintainers@...echerrydvr.com>
>> + *  Copyright (C) 2015 Andrey Utkin <andrey.utkin@...p.bluecherry.net>
>
> I doubt that you have contract with your employer which permits you to
> claim copyright on the work/product.

Thank you for commenting.
I have previously asked my employer to review copyright statment, and
he told this is fine.
Now I have requrested him again with reference to your comment.

-- 
Bluecherry developer.
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