linux-kernel - Re: [PATCH] USB: ftdi_sio: Fix locking for change

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Date:	Mon, 8 Mar 2010 17:35:48 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Alessio Igor Bogani <abogani@...ware.it>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Johan Hovold <jhovold@...il.com>,
	Alan Cox <alan@...ux.intel.com>, Daniel Mack <daniel@...aq.de>,
	"Mark J. Adamson" <mark.adamson@...ichip.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: ftdi_sio: Fix locking for change_speed() function

On Mon,  8 Mar 2010 14:10:03 +0100
Alessio Igor Bogani <abogani@...ware.it> wrote:

> The change_speed() function set the baudrate of the device: so this function
> should be serialized against multiple calls. Use the cfg_lock mutex to do this.

Should be ok anyway the set_termios callback occurs under the tty termios
lock, and will not occur in parallel with an initial open or final close.

Alan
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