linux-kernel - Re: [linux-usb-devel] [PATCH] Fix NEC OHCI chip silicon bug

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Date:	Fri, 1 Jun 2007 10:19:30 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Michael Hanselmann <linux-kernel@...smi.ch>
cc:	linux-kernel@...r.kernel.org, <dbrownell@...rs.sourceforge.net>,
	<linux-usb-devel@...ts.sourceforge.net>,
	<linux-kernel@...lerfox.forkbomb.ch>
Subject: Re: [linux-usb-devel] [PATCH] Fix NEC OHCI chip silicon bug

On Thu, 31 May 2007, Michael Hanselmann wrote:

> This patch fixes a silicon bug in some NEC OHCI chips. The bug appears
> at random times and is very, very difficult to reproduce. Without the
> following patch, Linux would shut the chip and its associated devices
> down. In Apple PowerBooks this leads to an unusable keyboard and mouse
> (SSH still working). The idea of restarting the chip is taken from
> public Darwin code.

> @@ -779,7 +790,11 @@ static int ohci_restart (struct ohci_hcd
>  	 */
>  	spin_lock_irq(&ohci->lock);
>  	disable (ohci);
> +
> +#ifdef CONFIG_PM
>  	usb_root_hub_lost_power(ohci_to_hcd(ohci)->self.root_hub);
> +#endif
> +

Suppose CONFIG_PM isn't defined.  How are you going to let usbcore 
know about all the old connections which no longer exist?

Alan Stern

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