linux-kernel - Re: [PATCH] iio: adc: Correct conditional logic for store mode

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Message-ID: <0b1b428d-9ad0-4581-a13a-88f4ffd6c4e3@baylibre.com>
Date: Mon, 14 Apr 2025 09:59:05 -0500
From: David Lechner <dlechner@...libre.com>
To: Gabriel Shahrouzi <gshahrouzi@...il.com>,
 Lars-Peter Clausen <lars@...afoo.de>,
 Michael Hennerich <Michael.Hennerich@...log.com>,
 Jonathan Cameron <jic23@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-iio@...r.kernel.org,
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc: gshahrozui@...il.com, skhan@...uxfoundation.org,
 kernelmentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] iio: adc: Correct conditional logic for store mode

On 4/14/25 9:09 AM, Gabriel Shahrouzi wrote:
> The mode setting logic in ad7816_store_mode was reversed due to
> incorrect handling of the strcmp return value. strcmp returns 0 on
> match, so the `if (strcmp(buf, "full"))` block executed when the
> input was not "full".
> 
> This resulted in "full" setting the mode to AD7816_PD (power-down) and
> other inputs setting it to AD7816_FULL.
> 
> Fix this by checking it against 0 to correctly check for "full" and
> "power-down", mapping them to AD7816_FULL and AD7816_PD respectively.
> 

Sounds like we need a Fixes: tag here that reference the commit
that introduced the bug.

> Signed-off-by: Gabriel Shahrouzi <gshahrouzi@...il.com>
> ---