Date: Tue, 26 May 2015 10:54:01 -0700
From: David Cohen <david.a.cohen@linux.intel.com>
To: =?iso-8859-1?Q?Bj=F8rn?= Mork <bjorn@mork.no>
Cc: Greg KH <gregkh@linuxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Tal Shorer <tal.shorer@gmail.com>,
        Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>,
        USB list <linux-usb@vger.kernel.org>,
        "<linux-kernel@vger.kernel.org>" <linux-kernel@vger.kernel.org>,
        Felipe Balbi <balbi@ti.com>, Lu Baolu <baolu.lu@linux.intel.com>
Subject: Re: [PATCH] usb: ulpi: don't register drivers if bus doesn't exist
Message-ID: <20150526175401.GA26397@psi-dev26.jf.intel.com>
References: <1432150406-20550-1-git-send-email-sasha.levin@oracle.com>
 <20150524071948.GA20923@kroah.com>
 <20150524080940.GA4033@sudip-PC>
 <CAFDyS3M1ZqrkGXGqdhTjyJp1eheJsDKLuBC-piC8jBUC=zt45Q@mail.gmail.com>
 <20150525114010.GA30679@kuha.fi.intel.com>
 <20150525161312.GB9772@kroah.com>
 <87a8wsoan6.fsf@nemi.mork.no>
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Hi,

On Mon, May 25, 2015 at 07:00:13PM +0200, Bj?rn Mork wrote:
> Greg KH <gregkh@linuxfoundation.org> writes:
> 
> > If there are other bus drivers that do this, I'll go fix them up,
> > pointers to those files would be appreciated.
> 
> git grep -E 'if .*\.p\W' found a couple of interesting candidates you
> might want to check out:
> 
>  drivers/i2c/i2c-core.c: if (unlikely(WARN_ON(!i2c_bus_type.p))) {
>  drivers/i2c/i2c-core.c: if (unlikely(WARN_ON(!i2c_bus_type.p)))
>  drivers/spmi/spmi.c:    if (WARN_ON(!spmi_bus_type.p))
> 
> And this looks somewhat suspicious too, but could very well be OK for
> all I know (very close to nothing :)
> 
>  drivers/gpio/gpiolib-sysfs.c:   if (!gpio_class.p) {
>  drivers/gpio/gpiolib-sysfs.c:   if (!gpio_class.p)

I think we need a clear statement on how to proceed on this case. With
Linux, the code is the documentation most of times. I gave a reviewed-by
feedback based on seeing other examples following the same approach.

What would be the correct way?

Thanks,

David
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