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

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Date:	Fri, 19 Oct 2007 16:29:15 -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:
> 
>> While attempting to configure a new USB modem, the following locking 
>> problem occurred. In addition, shortly after this problem occurred, the 
>> computer froze. The log data starts at the point that usbserial was 
>> loaded and contains everything that was written to disk before the 
>> machine locked up. Some info may be missing from the end of the stack 
>> dump.
> 
> I guess this one is needed.
> 
> 
> 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>
> 

Yes, this patch did fix the locking problem.

Thanks,

Larry
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