On 11/19/2015 01:48 AM, Baolin Wang wrote:
>>
>>> +{
>>> + struct gscons_info *info = gserial_cons.data;
>>> + int port_num = gserial_cons.index;
>>> + struct usb_request *req;
>>> + struct gs_port *port;
>>> + struct usb_ep *ep;
>>> +
>>> + if (port_num >= MAX_U_SERIAL_PORTS || port_num < 0) {
>>> + pr_err("%s: port num [%d] exceeds the range.\n",
>>> + __func__, port_num);
>>> + return -ENXIO;
>>> + }
>>> +
>>> + port = ports[port_num].port;
>>> + if (!port) {
>>> + pr_err("%s: serial line [%d] not allocated.\n",
>>> + __func__, port_num);
>>> + return -ENODEV;
>>> + }
>>> +
>>> + if (!port->port_usb) {
>>> + pr_err("%s: no port usb.\n", __func__);
>>> + return -ENODEV;
>>> + }
>>> +
>>> + ep = port->port_usb->in;
>>> + if (!ep) {
>>> + pr_err("%s: no usb endpoint.\n", __func__);
>>> + return -ENXIO;
>>> + }
>>
>> Looking at the caller, gserial_connect(), none of the error
>> conditions above look possible.
>>
>
> I re-look the code and do some tests, I found the checking is
> necessary. Cause we get the port number from the console->index, if
> the cmdline is not set the ttyGS0 as the console, the console->index
> will be -1 that is a wrong value. Also the serial.c file will create 1
> usb-to-seial port as default (default n_ports = 1), so we need to
> check the port and the endpoint of the port. So I think here checking
> is necessary and I have tested it.
static void gs_console_connect(int port_num)
{
.
.
if (port_num != gserial_cons.index)
return;
.
.
@@ -1219,6 +1453,7 @@ int gserial_connect(struct gserial *gser, u8 port_num)
gser->disconnect(gser);
}
+ status = gs_console_connect(port_num);
spin_unlock_irqrestore(&port->port_lock, flags);
return status;
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