linux-kernel - Re: [PATCH v2] pinctrl: mcp23s08: fix interrupt handling regression

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Date:   Wed, 18 Oct 2017 19:00:44 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Dmitry Mastykin <mastichi@...il.com>
Cc:     preid@...ctromag.com.au, Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] pinctrl: mcp23s08: fix interrupt handling regression

Hi,

On Wed, Oct 18, 2017 at 05:21:02PM +0300, Dmitry Mastykin wrote:
> interrupt handling was broken with conversion to using regmap caching.
> cached_gpio value was updated by boolean status instead of gpio reading.
> 
> Fixes: 8f38910ba4f6 ("pinctrl: mcp23s08: switch to regmap caching")
> Tested-by: Phil Reid <preid@...ctromag.com.au>
> Signed-off-by: Dmitry Mastykin <mastichi@...il.com>

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>

-- Sebastian

> ---
>  drivers/pinctrl/pinctrl-mcp23s08.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
> index 3e40d42..9c950bbf 100644
> --- a/drivers/pinctrl/pinctrl-mcp23s08.c
> +++ b/drivers/pinctrl/pinctrl-mcp23s08.c
> @@ -407,10 +407,10 @@ static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
>  	ret = mcp_read(mcp, MCP_GPIO, &status);
>  	if (ret < 0)
>  		status = 0;
> -	else
> +	else {
> +		mcp->cached_gpio = status;
>  		status = !!(status & (1 << offset));
> -
> -	mcp->cached_gpio = status;
> +	}
>  
>  	mutex_unlock(&mcp->lock);
>  	return status;
> -- 
> 2.7.4
> 

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