linux-kernel - Re: [PATCH 3.11 032/121] pinctrl: do not init debugfs entries for unimplemented functionalities

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Date:	Mon, 24 Feb 2014 10:01:00 +0000
From:	Luís Henriques <luis.henriques@...onical.com>
To:	Florian Vaussard <florian.vaussard@...l.ch>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 3.11 032/121] pinctrl: do not init debugfs entries for
 unimplemented functionalities

On Fri, Feb 21, 2014 at 01:59:50PM +0100, Florian Vaussard wrote:
> Hi,
> 
> On 02/21/2014 01:47 PM, Luis Henriques wrote:
> > 3.11.10.5 -stable review patch.  If anyone has any objections, please let me know.
> > 
> 
> This was nack'ed by Greg KH a few days ago. Please see [1].
> 

Ok, thank you for bringing this to my attention.  I'll drop this patch
from 3.5 and 3.11 kernels queues.

Cheers,
--
Luís

> Regards,
> Florian
> 
> [1] http://www.spinics.net/lists/stable/msg35959.html
> 
> > ------------------
> > 
> > From: Florian Vaussard <florian.vaussard@...l.ch>
> > 
> > commit e7f2a444891cb39f11d5429467d0fd7e011fe7fe upstream.
> > 
> > Commit c420619 "pinctrl: pinconf: remove checks on ops->pin_config_get"
> > removed the check on (ops != NULL) when performing pinconf_pins_show() or
> > pinconf_groups_show(). As these entries are always enabled, even if
> > pinconf is not supported, reading will result in an oops due to NULL
> > ops.
> > 
> > Instead of checking for ops, remove the corresponding debugfs entries if
> > pinconf and/or pinmux are not implemented.
> > 
> > Tested on OMAP3 (pinctrl-single).
> > 
> > Signed-off-by: Florian Vaussard <florian.vaussard@...l.ch>
> > Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
> > ---
> >  drivers/pinctrl/core.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
> > index dbcf284..dec5787 100644
> > --- a/drivers/pinctrl/core.c
> > +++ b/drivers/pinctrl/core.c
> > @@ -1621,8 +1621,10 @@ static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
> >  			    device_root, pctldev, &pinctrl_groups_ops);
> >  	debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
> >  			    device_root, pctldev, &pinctrl_gpioranges_ops);
> > -	pinmux_init_device_debugfs(device_root, pctldev);
> > -	pinconf_init_device_debugfs(device_root, pctldev);
> > +	if (pctldev->desc->pmxops)
> > +		pinmux_init_device_debugfs(device_root, pctldev);
> > +	if (pctldev->desc->confops)
> > +		pinconf_init_device_debugfs(device_root, pctldev);
> >  }
> >  
> >  static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
> > 
--
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