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 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 <sta...@vger.kernel.org>
Signed-off-by: Johan Hovold <jhov...@gmail.com>
---
drivers/usb/serial/pl2303.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 54adc91..3e2dd2c 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -245,6 +245,7 @@ static int pl2303_port_remove(struct usb_serial_port *port)
struct pl2303_private *priv;
priv = usb_get_serial_port_data(port);
+ wake_up_interruptible(&priv->delta_msr_wait);
kfree(priv);
return 0;
@@ -612,6 +613,9 @@ static int wait_modem_info(struct usb_serial_port *port,
unsigned int arg)
if (signal_pending(current))
return -ERESTARTSYS;
+ if (port->serial->disconnected)
+ return -EIO;
+
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
--
1.8.1.1
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