Commit 8da636d9 authored Oct 29, 2012 by Johan Hovold Committed by Greg Kroah-Hartman Oct 30, 2012

USB: ftdi_sio: optimise chars_in_buffer



No need to check hardware buffers when we know that the software
buffers are non-empty.

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

parent 755b6040

drivers/usb/serial/ftdi_sio.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2098,6 +2098,8 @@ static int ftdi_chars_in_buffer(struct tty_struct *tty)
		int ret;

		chars = usb_serial_generic_chars_in_buffer(tty);
		if (chars)
		return chars;

		/* Check hardware buffer */
		switch (priv->chip_type) {

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