From: Johan Hovold <jhovold@gmail.com>
Date: Wed, 5 May 2010 21:58:13 +0000 (+0200)
Subject: USB: serial: remove multi-urb write from generic driver
X-Git-Tag: v2.6.35-rc1~471^2~94
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c23e5fc1f7dba228558b4a46e68f7af89515b13c;p=pandora-kernel.git

USB: serial: remove multi-urb write from generic driver

Remove multi-urb write from the generic driver and simplify the
prepare_write_buffer prototype:

	int (*prepare_write_buffer)(struct usb_serial_port *port,
						void *dest, size_t size);

The default implementation simply fills dest with data from port write
fifo but drivers can override it if they need to process the outgoing
data (e.g. add headers).

Turn ftdi_sio into a generic fifo-based driver, which lowers CPU usage
significantly for small writes while retaining maximum throughput.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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