From: Johan Hovold johan@kernel.org
[ Upstream commit 5e84a66f3682af4f177bb24bb2ad5135c51f764a ]
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters.
The xmit_fifo_size parameter could be used to set the hardware transmit fifo size of a legacy UART when it could not be detected, but the interface is limited to eight bits and should be left unset when not used.
Fix the fwserial implementation by dropping its custom interpretation of the unused xmit_fifo_size field, which was overflowed with the driver FIFO size. Also leave the type and flags fields unset as these cannot be changed.
The close_delay and closing_wait parameters returned by TIOCGSERIAL are specified in centiseconds. The driver does not yet support changing closing_wait, but let's report back the default value actually used (30 seconds).
Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver") Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20210407102334.32361-5-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/staging/fwserial/fwserial.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c index 2888b80a2c1a..0f4655d7d520 100644 --- a/drivers/staging/fwserial/fwserial.c +++ b/drivers/staging/fwserial/fwserial.c @@ -1218,13 +1218,12 @@ static int get_serial_info(struct tty_struct *tty, struct fwtty_port *port = tty->driver_data;
mutex_lock(&port->port.mutex); - ss->type = PORT_UNKNOWN; - ss->line = port->port.tty->index; - ss->flags = port->port.flags; - ss->xmit_fifo_size = FWTTY_PORT_TXFIFO_LEN; + ss->line = port->index; ss->baud_base = 400000000; ss->close_delay = jiffies_to_msecs(port->port.close_delay) / 10; + ss->closing_wait = 3000; mutex_unlock(&port->port.mutex); + return 0; }