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USB: ftdi_sio: optimise chars_in_buffer

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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>
This commit is contained in:
Johan Hovold 2012-10-29 10:56:27 +01:00 committed by Greg Kroah-Hartman
parent 755b6040fa
commit 8da636d9b5
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/serial/ftdi_sio.c
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@ -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) {