On Thu, Jan 12, 2017 at 11:39:14PM +0300, Dan Carpenter wrote:
> Hello Johan Hovold,
>
> The patch 7a6ee2b02751: "USB: opticon: switch to generic read
> implementation" from Nov 18, 2012, leads to the following static
> checker warning:
>
> drivers/usb/serial/opticon.c:146 opticon_open()
> info: return a literal instead of 'res'
>
> drivers/usb/serial/opticon.c
> 128 static int opticon_open(struct tty_struct *tty, struct
> usb_serial_port *port)
> 129 {
> 130 struct opticon_private *priv = usb_get_serial_port_data(port);
> 131 unsigned long flags;
> 132 int res;
> 133
> 134 spin_lock_irqsave(&priv->lock, flags);
> 135 priv->rts = false;
> 136 spin_unlock_irqrestore(&priv->lock, flags);
> 137
> 138 /* Clear RTS line */
> 139 send_control_msg(port, CONTROL_RTS, 0);
> 140
> 141 /* clear the halt status of the endpoint */
> 142 usb_clear_halt(port->serial->dev, port->read_urb->pipe);
> 143
> 144 res = usb_serial_generic_open(tty, port);
> 145 if (!res)
> 146 return res;
>
> I think this if (!ret) statement is reversed. In the original code we
> used to send RESEND_CTS_STATE on both the failure and success paths.
Indeed it is. Thanks for reporting this.
> 147
> 148 /* Request CTS line state, sometimes during opening the
> current
> 149 * CTS state can be missed. */
> 150 send_control_msg(port, RESEND_CTS_STATE, 1);
> 151
> 152 return res;
> 153 }
Thanks,
Johan
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