From: Johan Hovold <jhovold@gmail.com>
Date: Wed, 17 Mar 2010 22:06:08 +0000 (+0100)
Subject: USB: serial: generalise write buffer preparation
X-Git-Tag: v2.6.35-rc1~471^2~176
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eaa3bcb06aed1ac1d6d9e3edd3b5f72ea57a6ac0;p=pandora-kernel.git

USB: serial: generalise write buffer preparation

Generalise write buffer preparation.

This allows for drivers to manipulate (e.g. add headers) to bulk out
data before it is sent.

This adds a new function pointer to usb_serial_driver:

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

The function is generic and can be used with either kfifo-based or
multi-urb writes:

If *dest is NULL the implementation should allocate dest.
If src is NULL the implementation should use the port write fifo.

If not set, a generic implementation is used which simply uses memcpy or
kfifo_out.

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