linux-kernel - Re: rtc: isl1208: avoid possible sysfs race

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Message-ID: <20180925074714.GG13455@piout.net>
Date:   Tue, 25 Sep 2018 09:47:14 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Denis OSTERLAND <denis.osterland@...hl.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "khoroshilov@...ras.ru" <khoroshilov@...ras.ru>
Subject: Re: rtc: isl1208: avoid possible sysfs race

On 25/09/2018 06:46:24+0000, Denis OSTERLAND wrote:
> Hi,
> 
> just for clarification:
> This changes user-space representation from
> /sys/class/rtc/rtcN/device/{atrim,dtrim,usr}
> to
> /sys/class/rtc/rtcN/{atrim,dtrim,usr}
> and fixes the "mistake made back in 2006" you mention in
> https://patchwork.ozlabs.org/patch/881397/
> correct?
> 

This is correct. At some point, it would also be great to move from
atrim/dtrim to offset

> Regards Denis
> 
> Am Samstag, den 15.09.2018, 13:43 +0200 schrieb Alexandre Belloni:
> > Use rtc_add_group to add the common sysfs group to avoid a possible race
> > condition.
> > 
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> > ---
> >  drivers/rtc/rtc-isl1208.c | 11 +----------
> >  1 file changed, 1 insertion(+), 10 deletions(-)
> > 
> > diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
> > index ea18a8f4bce0..e1e9434c9972 100644
> > --- a/drivers/rtc/rtc-isl1208.c
> > +++ b/drivers/rtc/rtc-isl1208.c
> > @@ -804,7 +804,7 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
> >  		evdet_irq = of_irq_get_byname(np, "evdet");
> >  	}
> >  
> > -	rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
> > +	rc = rtc_add_group(rtc, &isl1208_rtc_sysfs_files);
> >  	if (rc)
> >  		return rc;
> >  
> > @@ -821,14 +821,6 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
> >  	return rtc_register_device(rtc);
> >  }
> >  
> > -static int
> > -isl1208_remove(struct i2c_client *client)
> > -{
> > -	sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
> > -
> > -	return 0;
> > -}
> > -
> >  static const struct i2c_device_id isl1208_id[] = {
> >  	{ "isl1208", TYPE_ISL1208 },
> >  	{ "isl1218", TYPE_ISL1218 },
> > @@ -851,7 +843,6 @@ static struct i2c_driver isl1208_driver = {
> >  		.of_match_table = of_match_ptr(isl1208_of_match),
> >  	},
> >  	.probe = isl1208_probe,
> > -	.remove = isl1208_remove,
> >  	.id_table = isl1208_id,
> >  };
> >  
> 
> Diehl Connectivity Solutions GmbH
> Geschäftsführung: Horst Leonberger
> Sitz der Gesellschaft: Nürnberg - Registergericht: Amtsgericht
> Nürnberg: HRB 32315
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-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com