linux-kernel - Re: [PATCH 1/2] extcon: add driver for Intel USB mux

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Date:	Wed, 2 Dec 2015 10:17:22 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Lu Baolu <baolu.lu@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] extcon: add driver for Intel USB mux

Hi Heikki,

On Wed, Dec 02, 2015 at 12:27:10PM +0200, Heikki Krogerus wrote:
> Hi David,
> 
> <snip>
> 
> > > +void intel_usb_mux_unregister(struct intel_usb_mux *mux)
> > > +{
> > 
> > There are still 2 pending comments for this unregister function:
> > 
> > 1) How about a protection against unbalanced unregistering? In case an
> > user mistakenly unregisters twice or unregisters without a previous
> > registering.
> 
> True. You already pointed that out in our off-list thread, but I
> forgot. Sorry about that.
> 
> > 2) When unregistering, you need to clear the bit CFG0_SW_IDPIN_EN to
> > set mux to automatic mode again. Or maybe you could save CFG0's initial
> > value and set it again here. Anyway, when unregistering the mux driver
> > you need to make sure the mux goes back to its original configuration.
> 
> This one is already been taken care of..
> 
> > > +	extcon_unregister_notifier(&mux->edev, EXTCON_USB_HOST, &mux->nb);
> > > +	extcon_dev_unregister(&mux->edev);
> > > +	writel(mux->cfg0_ctx, mux->regs + INTEL_MUX_CFG0);
> 
>         ^^^^^^^^^^^^^^^^^^^^

Of course :)
Sorry I missed this part.

Br, David
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