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Commit 8da636d9 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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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: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 755b6040

drivers/usb/serial/ftdi_sio.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -2098,6 +2098,8 @@ static int ftdi_chars_in_buffer(struct tty_struct *tty) 
	int ret;

	int ret;





	chars = usb_serial_generic_chars_in_buffer(tty);

	chars = usb_serial_generic_chars_in_buffer(tty);

	if (chars)

		return chars;





	/* Check hardware buffer */

	/* Check hardware buffer */

	switch (priv->chip_type) {

	switch (priv->chip_type) {