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

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Date:	Wed, 27 May 2015 14:35:13 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Tal Shorer <tal.shorer@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	USB list <linux-usb@...r.kernel.org>,
	"<linux-kernel@...r.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

On Wed, May 27, 2015 at 11:39:33AM +0300, Heikki Krogerus wrote:
> Hi Greg,
> 
> I can appreciate now that fixing the core problem like I2C did is
> wrong, but I still feel that the driver core should provide something
> like the helper for checking if the bus was registered already or not.
> Otherwise all the bus drivers should really have a variable like Sudip
> suggested for checking it, but that would be boilerplate, no?
There might have been another way. There was a function called find_bus()
but it is under #if 0 , it used to find for a registered bus with its
name and NULL if not registered.

regards
sudip


> 
> Thanks,
> 
> -- 
> heikki
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