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Date:   Mon, 24 Sep 2018 18:07:10 -0500
From:   Dan Rue <dan.rue@linaro.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        "H. Nikolaus Schaller" <hns@goldelico.com>,
        Christ van Willegen <cvwillegen@gmail.com>,
        Haojian Zhuang <haojian.zhuang@linaro.org>,
        Jacopo Mondi <jacopo+renesas@jmondi.org>,
        Paul Cercueil <paul@crapouillou.net>,
        Sean Wang <sean.wang@mediatek.com>,
        Tony Lindgren <tony@atomide.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: Re: [PATCH 4.18 164/235] pinctrl: pinmux: Return selector to the
 pinctrl driver
Message-ID: <20180924230710.o7bqbw353few6pjw@xps.therub.org>
Mail-Followup-To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        "H. Nikolaus Schaller" <hns@goldelico.com>,
        Christ van Willegen <cvwillegen@gmail.com>,
        Haojian Zhuang <haojian.zhuang@linaro.org>,
        Jacopo Mondi <jacopo+renesas@jmondi.org>,
        Paul Cercueil <paul@crapouillou.net>,
        Sean Wang <sean.wang@mediatek.com>,
        Tony Lindgren <tony@atomide.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Sasha Levin <alexander.levin@microsoft.com>
References: <20180924113103.999624566@linuxfoundation.org>
 <20180924113121.469295005@linuxfoundation.org>
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On Mon, Sep 24, 2018 at 01:52:30PM +0200, Greg Kroah-Hartman wrote:
> 4.18-stable review patch.  If anyone has any objections, please let me know.

I bisected a boot failure on an x15 (arm) board to this commit on
4.18.10-rc1. I'm also seeing issues on 4.14 and 4.18 with arm64 boards
hikey and dragonboard 410c, but I have not investigated them yet (they
could be unrelated).

I see there are fixes to this commit that have not been backported.
Namely:

823dd71f58eb ("pinctrl: ingenic: Fix group & function error checking")
a203728ac6bb ("pinctrl: core: Return selector to the pinctrl driver")

However, I tried adding those two in but I still see the boot failure on
x15.

Dan

> 
> ------------------
> 
> From: Tony Lindgren <tony@atomide.com>
> 
> [ Upstream commit f913cfce4ee49a3382a9ff95696f49a46e56e974 ]
> 
> We must return the selector from pinmux_generic_add_function() so
> pin controller device drivers can remove the right group if needed
> for deferred probe for example. And we now must make sure that a
> proper name is passed so we can use it to check if the entry already
> exists.
> 
> Note that fixes are also needed for the pin controller drivers to
> use the selector value.
> 
> Fixes: a76edc89b100 ("pinctrl: core: Add generic pinctrl functions for
> managing groups")
> Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
> Cc: Christ van Willegen <cvwillegen@gmail.com>
> Cc: Haojian Zhuang <haojian.zhuang@linaro.org>
> Cc: Jacopo Mondi <jacopo+renesas@jmondi.org>
> Cc: Paul Cercueil <paul@crapouillou.net>
> Cc: Sean Wang <sean.wang@mediatek.com>
> Signed-off-by: Tony Lindgren <tony@atomide.com>
> Tested-By: H. Nikolaus Schaller <hns@goldelico.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/pinctrl/pinmux.c |   16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> --- a/drivers/pinctrl/pinmux.c
> +++ b/drivers/pinctrl/pinmux.c
> @@ -308,7 +308,6 @@ static int pinmux_func_name_to_selector(
>  		selector++;
>  	}
>  
> -	dev_err(pctldev->dev, "function '%s' not supported\n", function);
>  	return -EINVAL;
>  }
>  
> @@ -775,6 +774,16 @@ int pinmux_generic_add_function(struct p
>  				void *data)
>  {
>  	struct function_desc *function;
> +	int selector;
> +
> +	if (!name)
> +		return -EINVAL;
> +
> +	selector = pinmux_func_name_to_selector(pctldev, name);
> +	if (selector >= 0)
> +		return selector;
> +
> +	selector = pctldev->num_functions;
>  
>  	function = devm_kzalloc(pctldev->dev, sizeof(*function), GFP_KERNEL);
>  	if (!function)
> @@ -785,12 +794,11 @@ int pinmux_generic_add_function(struct p
>  	function->num_group_names = num_groups;
>  	function->data = data;
>  
> -	radix_tree_insert(&pctldev->pin_function_tree, pctldev->num_functions,
> -			  function);
> +	radix_tree_insert(&pctldev->pin_function_tree, selector, function);
>  
>  	pctldev->num_functions++;
>  
> -	return 0;
> +	return selector;
>  }
>  EXPORT_SYMBOL_GPL(pinmux_generic_add_function);
>  
> 
>