linux-kernel - Re: [PATCH 16/28] staging: most: sound: call snd_card

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Message-ID: <1556530363.2904.8.camel@microchip.com>
Date:   Mon, 29 Apr 2019 09:29:45 +0000
From:   <Christian.Gromm@...rochip.com>
To:     <erosca@...adit-jv.com>
CC:     <andrey.shvetsov@....de>, <driverdev-devel@...uxdriverproject.org>,
        <sudipi@...adit-jv.com>, <gregkh@...uxfoundation.org>,
        <roscaeugeniu@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/28] staging: most: sound: call snd_card_new with struct
 device

On Mi, 2019-04-24 at 20:50 +0200, Eugeniu Rosca wrote:
> External E-Mail
> 
> 
> Hi Christian,
> 
> On Tue, 08 May 2018 02:46:44 -0700, Christian Gromm wrote:
> > 
> >     This patch is needed as function snd_card_new needs a valid
> >     parent device. Passing a NULL pointer leads to kernel Ooops.
> >     
> >     Signed-off-by: Christian Gromm <christian.gromm@...rochip.com>
> > ---
> >  drivers/staging/most/core.h        | 1 +
> >  drivers/staging/most/sound/sound.c | 2 +-
> >  drivers/staging/most/usb/usb.c     | 1 +
> >  3 files changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/most/core.h
> > b/drivers/staging/most/core.h
> > index 7a3c70bead19..64cc02f161e7 100644
> > --- a/drivers/staging/most/core.h
> > +++ b/drivers/staging/most/core.h
> > @@ -230,6 +230,7 @@ struct mbo {
> >   */
> >  struct most_interface {
> >  	struct device dev;
> > +	struct device *driver_dev;
> >  	struct module *mod;
> >  	enum most_interface_type interface;
> >  	const char *description;
> > diff --git a/drivers/staging/most/sound/sound.c
> > b/drivers/staging/most/sound/sound.c
> > index 18f722410a63..04c18323c2ea 100644
> > --- a/drivers/staging/most/sound/sound.c
> > +++ b/drivers/staging/most/sound/sound.c
> > @@ -590,7 +590,7 @@ static int audio_probe_channel(struct
> > most_interface *iface, int channel_id,
> >  	if (ret < 0)
> >  		return ret;
> >  
> > -	ret = snd_card_new(NULL, -1, card_name, THIS_MODULE,
> > +	ret = snd_card_new(&iface->dev, -1, card_name,
> > THIS_MODULE,
> >  			   sizeof(*channel), &card);
> >  	if (ret < 0)
> >  		return ret;
> > diff --git a/drivers/staging/most/usb/usb.c
> > b/drivers/staging/most/usb/usb.c
> > index 5ed1dccc0839..f18726049528 100644
> > --- a/drivers/staging/most/usb/usb.c
> > +++ b/drivers/staging/most/usb/usb.c
> > @@ -1043,6 +1043,7 @@ hdm_probe(struct usb_interface *interface,
> > const struct usb_device_id *id)
> >  	mdev->link_stat_timer.expires = jiffies + (2 * HZ);
> >  
> >  	mdev->iface.mod = hdm_usb_fops.owner;
> > +	mdev->iface.driver_dev = &interface->dev;
> >  	mdev->iface.interface = ITYPE_USB;
> >  	mdev->iface.configure = hdm_configure_channel;
> >  	mdev->iface.request_netinfo = hdm_request_netinfo;
> Just for your information, when mapping commits from vanilla to those
> from https://github.com/microchip-ais/linux/commits/mld-1.8.0, we've
> stumbled upon some subtle but striking difference between mld-1.8.0
> commit [0] and v4.18-rc1 commit [1]. The latter looks like an
> upstreamed
> version of the former. However, while commit [0] creates a new 'dev'
> member in 'struct most_interface' and uses it consistently, commit
> [1]
> creates 'driver_dev' and uses it intermixed with 'dev'.

This looks sort of suspicious. I'll check it.

Thanks for letting me know.

Regards,
Chris

> 
> Since we don't use aim-sound, we just signal this feedback to you
> as FWIW without sending a patch (which we can't test).
> 
> [0] https://github.com/microchip-ais/linux/commit/2fef0f89f04703
>     ("staging: most: add struct device to most interface")
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.gi
> t/commit/?id=69c90cf1b2faf5
>     ("staging: most: sound: call snd_card_new with struct device")
>