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From: Vitor Soares <Vitor.Soares@synopsys.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Jose Abreu <Jose.Abreu@synopsys.com>,
	"corbet@lwn.net" <corbet@lwn.net>,
	Joao Pinto <Joao.Pinto@synopsys.com>,
	"arnd@arndb.de" <arnd@arndb.de>,
	"bbrezillon@kernel.org" <bbrezillon@kernel.org>,
	"wsa@the-dreams.de" <wsa@the-dreams.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"broonie@kernel.org" <broonie@kernel.org>,
	"linux-i3c@lists.infradead.org" <linux-i3c@lists.infradead.org>
Subject: RE: [PATCH v3 3/5] i3c: master: add i3c_for_each_dev helper
Date: Fri, 21 Feb 2020 11:47:22 +0000
Message-ID: <CH2PR12MB4216D5141E562974634430B8AE120@CH2PR12MB4216.namprd12.prod.outlook.com> (raw)
In-Reply-To: <20200219073548.GA2728338@kroah.com>

Hi Greg,

From: Greg KH <gregkh@linuxfoundation.org>
Date: Wed, Feb 19, 2020 at 07:35:48

> On Wed, Feb 19, 2020 at 01:20:41AM +0100, Vitor Soares wrote:
> > Introduce i3c_for_each_dev(), an i3c device iterator for use by i3cdev.
> > 
> > Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
> > ---
> >  drivers/i3c/internals.h |  1 +
> >  drivers/i3c/master.c    | 12 ++++++++++++
> >  2 files changed, 13 insertions(+)
> > 
> > diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h
> > index bc062e8..a6deedf 100644
> > --- a/drivers/i3c/internals.h
> > +++ b/drivers/i3c/internals.h
> > @@ -24,4 +24,5 @@ int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev);
> >  int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev,
> >  			       const struct i3c_ibi_setup *req);
> >  void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev);
> > +int i3c_for_each_dev(void *data, int (*fn)(struct device *, void *));
> >  #endif /* I3C_INTERNAL_H */
> > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> > index 21c4372..8e22da2 100644
> > --- a/drivers/i3c/master.c
> > +++ b/drivers/i3c/master.c
> > @@ -2640,6 +2640,18 @@ void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev)
> >  	dev->ibi = NULL;
> >  }
> >  
> > +int i3c_for_each_dev(void *data, int (*fn)(struct device *, void *))
> > +{
> > +	int res;
> > +
> > +	mutex_lock(&i3c_core_lock);
> > +	res = bus_for_each_dev(&i3c_bus_type, NULL, data, fn);
> > +	mutex_unlock(&i3c_core_lock);
> 
> Ick, why the lock?  Are you _sure_ you need that?  The core should
> handle any list locking issues here, right?

I want to make sure that no new devices (eg: Hot-Join capable device) are 
added during this iteration and after this call, each new device will 
release a bus notification.

> 
> I don't see bus-specific-locks around other subsystem functions that do
> this (like usb_for_each_dev).

I based in I2C use case.

> 
> thanks,
> 
> greg k-h
> 
> _______________________________________________
> linux-i3c mailing list
> linux-i3c@lists.infradead.org
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.infradead.org_mailman_listinfo_linux-2Di3c&d=DwICAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=qVuU64u9x77Y0Kd0PhDK_lpxFgg6PK9PateHwjb_DY0&m=tlMumonboh0P8ljWml7h8q161eLTzDbo5QF77YPi2t8&s=RYYk4dJ4Ujse2MjdOBsoEwEOkxXDStTffqzlFZhwlXQ&e= 

Best regards,
Vitor Soares

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  reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-19  0:20 [PATCH v3 0/5] Introduce i3c device userspace interface Vitor Soares
2020-02-19  0:20 ` [PATCH v3 1/5] i3c: master: export i3c_masterdev_type Vitor Soares
2020-02-19  0:20 ` [PATCH v3 2/5] i3c: master: export i3c_bus_type symbol Vitor Soares
2020-02-19  0:20 ` [PATCH v3 3/5] i3c: master: add i3c_for_each_dev helper Vitor Soares
2020-02-19  7:35   ` Greg KH
2020-02-21 11:47     ` Vitor Soares [this message]
2020-02-21 11:52       ` Greg KH
2020-02-21 12:59         ` Boris Brezillon
2020-02-21 16:44           ` Boris Brezillon
2020-02-21 16:45             ` Boris Brezillon
2020-02-21 17:19             ` Vitor Soares
2020-02-22  8:38             ` Boris Brezillon
2020-02-19  0:20 ` [PATCH v3 4/5] i3c: add i3cdev module to expose i3c dev in /dev Vitor Soares
2020-02-19  7:37   ` Greg KH
2020-02-19  8:45     ` Vitor Soares
2020-02-19  7:39   ` Greg KH
2020-02-21 11:50     ` Vitor Soares
2020-02-19  8:42   ` Greg KH
2020-02-21 22:32   ` Boris Brezillon
2020-02-24 11:04     ` Vitor Soares
2020-02-24 11:22       ` Boris Brezillon
2020-02-19  0:20 ` [PATCH v3 5/5] add i3cdev documentation Vitor Soares
2020-02-19  0:46   ` Vitor Soares
2020-02-19  4:34   ` Randy Dunlap
2020-02-21 10:31     ` Vitor Soares
2020-02-21 15:36       ` Randy Dunlap
2020-02-19  0:39 ` [PATCH v3 0/5] Introduce i3c device userspace interface Vitor Soares
2020-02-19  8:16   ` Boris Brezillon
2020-02-21 17:08     ` Vitor Soares
2020-02-21 17:41       ` Boris Brezillon
2020-02-24 10:53         ` Vitor Soares
2020-02-24 11:24           ` Boris Brezillon

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