linux-kernel - Re: [PATCH] usb: ulpi: don't register drivers if bus doesn't exist

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Message-ID: <87a8wsoan6.fsf@nemi.mork.no>
Date:	Mon, 25 May 2015 19:00:13 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Tal Shorer <tal.shorer@...il.com>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	USB list <linux-usb@...r.kernel.org>,
	"\<linux-kernel\@vger.kernel.org\>" <linux-kernel@...r.kernel.org>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Felipe Balbi <balbi@...com>,
	Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH] usb: ulpi: don't register drivers if bus doesn't exist

Greg KH <gregkh@...uxfoundation.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)



Bjørn
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