linux-kernel - Re: [PATCH] USB: fix interrupt disabling for HCDs with shared interrupt handlers

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Date:	Mon, 30 Jun 2008 15:35:25 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Stefan Becker <Stefan.Becker@...ia.com>
cc:	David Brownell <david-b@...bell.net>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	ext Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] USB: fix interrupt disabling for HCDs with shared
 interrupt handlers

On Mon, 30 Jun 2008, Stefan Becker wrote:

> Hi,
> 
> here is the proposed patch to fix the problem. I hope I used git 
> correctly to generate it...

> This patch doesn't modify the interface of usb_add_hcd(), i.e. HCD code
> can still use IRQF_DISABLED. It will now silently convert this into an
> internal HCD flag and clear IRQF_DISABLED before requesting the interrupt
> from the Linux core. usb_hcd_irq() will check this flag to disable/re-enable
> the interrupts on a case by case basis.

Don't bother with this extra stuff.  All USB host controller drivers
want to have interrupts disabled when their IRQ handlers run.

Alan Stern

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