USB: cdc-acm: fix TIOCGSERIAL flags

The driver reports that it always uses a low-latency mode by returning
the ASYNC_LOW_LATENCY flag through TIOCGSERIAL.

Even if this behaviour could not be changed, this may have made some
sense prior to 7a9a65ced11e ("cdc-acm: Fix long standing abuse of
tty->low_latency") which removed the unconditional setting of the
corresponding tty low_latency flag (something which had always been
broken in itself).

Since the driver does not have a low-latency mode, let's drop the flag.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index e35b1508d3eb0ce0ba1b54ee50bc610cee703427..235e305f8473a2d8eebbc32883f803290bc22f43 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -913,7 +913,6 @@ static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
        struct serial_struct tmp;
 
        memset(&tmp, 0, sizeof(tmp));
-       tmp.flags = ASYNC_LOW_LATENCY;
        tmp.xmit_fifo_size = acm->writesize;
        tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
        tmp.close_delay = acm->port.close_delay / 10;