From: Johan Hovold johan@kernel.org
commit c01d2c58698f710c9e13ba3e2d296328606f74fd upstream.
Make sure to clear the write-busy flag also in case no new data was submitted due to lack of device buffer space so that writing is resumed once space again becomes available.
Fixes: 507ca9bc0476 ("[PATCH] USB: add ability for usb-serial drivers to determine if their write urb is currently being used.") Cc: stable stable@vger.kernel.org # 2.6.13 Acked-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/serial/keyspan_pda.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -552,7 +552,7 @@ static int keyspan_pda_write(struct tty_
rc = count; exit: - if (rc < 0) + if (rc <= 0) set_bit(0, &port->write_urbs_free); return rc; }