linux-kernel - Re: [PATCH] leds: ti-lmu-common: Fix coccinelle issue in TI LMU

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Message-ID: <de1bb95d-d5ca-6f8f-e758-b03479091f99@ti.com>
Date:   Mon, 26 Aug 2019 09:53:05 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>, <pavel@....cz>
CC:     <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] leds: ti-lmu-common: Fix coccinelle issue in TI LMU

Jacek

On 8/24/19 10:18 AM, Jacek Anaszewski wrote:
> Hi Dan,
>
> Thank you for the patch.
>
> On 8/23/19 9:55 PM, Dan Murphy wrote:
>> Fix the coccinelle issues found in the TI LMU common code
>>
>> drivers/leds/leds-ti-lmu-common.c:97:20-29: WARNING: Unsigned expression compared with zero: ramp_down < 0
>> drivers/leds/leds-ti-lmu-common.c:97:5-12: WARNING: Unsigned expression compared with zero: ramp_up < 0
> Wouldn't it make more sense to remove those pointless checks?
> Clearly a correct index of an array cannot be negative.
> Looking at the code I would make more int -> unsigned int conversions:
>
> - ramp_table should be unsigned int
> - ti_lmu_common_convert_ramp_to_index should return unsigned int
>
Yeah I was going to just remove the code but when I was writing the 
original code my intent was

to extend the ramp call to allow other TI LMU driver to pass in the 
device specific ramp table.

But since I don't currently have any devices on my plate that require 
that I can just remove the code as well

Dan

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