linux-kernel - Re: Locking problem in usbserial with 2.6.23-git 5a34417f

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Message-ID: <47192D69.60203@lwfinger.net>
Date:	Fri, 19 Oct 2007 17:19:21 -0500
From:	Larry Finger <larry.finger@...inger.net>
To:	Jiri Kosina <jikos@...os.cz>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: Locking problem in usbserial with 2.6.23-git 5a34417f

Jiri Kosina wrote:
> On Fri, 19 Oct 2007, Larry Finger wrote:
> 
>> As I said earlier, the lock problem went away; however, I get the 
>> following two kernel warnings:
> 
> That's because I messed up the patch, sorry. The one below should work 
> better.
> 
> 
> 
> From: Jiri Kosina <jkosina@...e.cz>
> 
> USB: usbserial - fix potential deadlock between write() and IRQ
> 
> usb_serial_generic_write() doesn't disable interrupts when taking port->lock,
> and could therefore deadlock with usb_serial_generic_read_bulk_callback()
> being called from interrupt, taking the same lock. Fix it.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

It does work better. With it, I was able to make a dial-up connection and send pings over it.

Larry

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