linux-kernel - Re: [linux-usb-devel] USB HCD: avoid duplicate local_irq

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Message-ID: <20071025183352.GB2176@kroah.com>
Date:	Thu, 25 Oct 2007 11:33:52 -0700
From:	Greg KH <greg@...ah.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Arnd Bergmann <arnd@...db.de>, gregkh@...e.de,
	linux-arch@...r.kernel.org, linux-usb-devel@...ts.sourceforge.net,
	matthew@....cx, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>, ralf@...ux-mips.org,
	Thomas Gleixner <tglx@...utronix.de>, viro@...iv.linux.org.uk,
	viro@....linux.org.uk, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	adobriyan@...il.com
Subject: Re: [linux-usb-devel] USB HCD: avoid duplicate local_irq_disable()

On Tue, Oct 23, 2007 at 12:01:37AM -0400, Alan Stern wrote:
> On Tue, 23 Oct 2007, Arnd Bergmann wrote:
> 
> > usb_hcd_flush_endpoint() has a retry loop that starts with a spin_lock_irq(),
> > but only gives up the spinlock, not the irq_disable before jumping to the
> > rescan label.
> > 
> > Split the spin_lock_irq into the retryable part and the local_irq_disable()
> > that is only done once as a micro-optimization and slight cleanup.
> 
> I agree with your sentiment, but it would be better to solve this 
> problem without using local_irq_disable().  The patch below does this.
> 
> ---
> 
> Signed-off-by: Alan Stern <stern@...land.harvard.edu>

Alan, is this something you want added to the tree and in before 2.6.24
is out?

thanks,

greg k-h
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