linux-kernel - Re: [PATCH v2] sound/hda: Add NULL check to component match callback function

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Message-ID: <YkXSbPG+PuyGub2V@lahna>
Date:   Thu, 31 Mar 2022 19:10:20 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Benson Leung <bleung@...gle.com>
Cc:     Takashi Iwai <tiwai@...e.de>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Won Chung <wonchung@...gle.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Benson Leung <bleung@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] sound/hda: Add NULL check to component match callback
 function

Hi,

On Thu, Mar 31, 2022 at 08:33:03AM -0700, Benson Leung wrote:
> > --- a/sound/hda/hdac_i915.c
> > +++ b/sound/hda/hdac_i915.c
> > @@ -102,18 +102,13 @@ static int i915_component_master_match(struct device *dev, int subcomponent,
> >  	struct pci_dev *hdac_pci, *i915_pci;
> >  	struct hdac_bus *bus = data;
> >  
> > -	if (!dev_is_pci(dev))
> > +	if (subcomponent != I915_COMPONENT_AUDIO || !dev_is_pci(dev))
> >  		return 0;
> >  
> 
> If I recall this bug correctly, it's not the usb port perse that is falling
> through this !dev_is_pci(dev) check, it's actually the usb4-port in a new
> proposed patch by Heikki and Mika to extend the usb type-c component to
> encompass the usb4 specific pieces too. Is it possible usb4 ports are considered
> pci devices, and that's how we got into this situation?

For usb4_port the dev_ic_pci(dev) returns false:

  #define dev_is_pci(d) ((d)->bus == &pci_bus_type)

We don't attach them to PCI bus (well they are not PCI devices).