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USB: serial: digi_acceleport: fix broken rx after throttle

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If the port is closed while throttled, the read urb is never resubmitted
and the port will not receive any further data until the device is
reconnected (or the driver is rebound).

Clear the throttle flags and submit the urb if needed when opening the
port.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold
2026-06-23 17:08:15 +02:00
parent 5c1ea24b53
commit 83a3dfc018
1 changed files with 16 additions and 0 deletions
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16
drivers/usb/serial/digi_acceleport.c
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@@ -1076,6 +1076,7 @@ static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
unsigned char buf[32];
struct digi_port *priv = usb_get_serial_port_data(port);
struct ktermios not_termios;
int throttled;
/* be sure the device is started up */
if (digi_startup_device(port->serial) != 0)
@@ -1103,6 +1104,21 @@ static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
not_termios.c_iflag = ~tty->termios.c_iflag;
digi_set_termios(tty, port, &not_termios);
}
spin_lock_irq(&priv->dp_port_lock);
throttled = priv->dp_throttle_restart;
priv->dp_throttled = 0;
priv->dp_throttle_restart = 0;
spin_unlock_irq(&priv->dp_port_lock);
if (throttled) {
ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (ret) {
dev_err(&port->dev, "failed to submit read urb: %d\n", ret);
return ret;
}
}
return 0;
}