linux-kernel - Re: [PATCH v4 1/1] usb: ulpi: ulpi_init should be executed in subsys

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Message-ID: <20150527165327.GB1028@psi-dev26.jf.intel.com>
Date:	Wed, 27 May 2015 09:53:27 -0700
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Lu Baolu <baolu.lu@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	balbi@...com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, qiuxu.zhuo@...el.com
Subject: Re: [PATCH v4 1/1] usb: ulpi: ulpi_init should be executed in
 subsys_initcall

Hi,

On Tue, May 26, 2015 at 07:37:02PM -0700, Greg Kroah-Hartman wrote:
> On Wed, May 27, 2015 at 09:45:37AM +0800, Lu Baolu wrote:
> > Phy drivers and the ulpi interface providers depend on the
> > registration of the ulpi bus.  Ulpi registers the bus in
> > module_init(). This could cause unnecessary probe delays.
> 
> What do you mean by "probe delays"?

I believe he meant the bus users' probe delays. i.e. unnecessary
-EPROBE_DEFER happening on ulpi_drivers in case they're registered
before ulpi bus itself.

Is that correct, Baolu?

Br, David
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