Make sure to wake up any process sleeping on the modem-status-change
queue at port remove.
Currently a process waiting on modem status changes will not
necessarily be woken on device disconnect.
Note that we need to use the disconnected flag to detect disconnect as
the port private data may have been freed when woken up.
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
---
drivers/usb/serial/io_edgeport.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index b00e5cb..c81b682 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -1676,10 +1676,12 @@ static int edge_ioctl(struct tty_struct *tty,
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
+
+ if (port->serial->disconnected)
+ return -EIO;
+
cnow = edge_port->icount;
- if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
- cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
- return -EIO; /* no change => error */
+
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
@@ -3113,6 +3115,8 @@ static int edge_port_remove(struct usb_serial_port *port)
{
struct edgeport_port *edge_port;
+ wake_up_interruptible(&edge_port->delta_msr_wait);
+
edge_port = usb_get_serial_port_data(port);
kfree(edge_port);
--
1.8.1.1
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
