[PATCH 1/2] USB: serial: kl5kusb105: fix open error path

From: Johan Hovold
Date: Tue Nov 29 2016 - 10:55:55 EST


Kill urbs and disable read before returning from open on failure to
retrieve the line state.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/kl5kusb105.c | 33 ++++++++++++++++++++++++---------
1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index fc5d3a791e08..6f29bfadbe33 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -296,7 +296,7 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
rc = usb_serial_generic_open(tty, port);
if (rc) {
retval = rc;
- goto exit;
+ goto err_free_cfg;
}

rc = usb_control_msg(port->serial->dev,
@@ -315,17 +315,32 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
dev_dbg(&port->dev, "%s - enabled reading\n", __func__);

rc = klsi_105_get_line_state(port, &line_state);
- if (rc >= 0) {
- spin_lock_irqsave(&priv->lock, flags);
- priv->line_state = line_state;
- spin_unlock_irqrestore(&priv->lock, flags);
- dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
- retval = 0;
- } else
+ if (rc < 0) {
retval = rc;
+ goto err_disable_read;
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->line_state = line_state;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__,
+ line_state);
+
+ return 0;

-exit:
+err_disable_read:
+ usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ KL5KUSB105A_SIO_CONFIGURE,
+ USB_TYPE_VENDOR | USB_DIR_OUT,
+ KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
+ 0, /* index */
+ NULL, 0,
+ KLSI_TIMEOUT);
+ usb_serial_generic_close(port);
+err_free_cfg:
kfree(cfg);
+
return retval;
}

--
2.7.3