diff options
Diffstat (limited to 'drivers/usb/serial/usb-serial.c')
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 42 |
1 files changed, 33 insertions, 9 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 9bf01a5efc8..4b1bd7def4a 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -578,6 +578,17 @@ static void kill_traffic(struct usb_serial_port *port) { usb_kill_urb(port->read_urb); usb_kill_urb(port->write_urb); + /* + * This is tricky. + * Some drivers submit the read_urb in the + * handler for the write_urb or vice versa + * this order determines the order in which + * usb_kill_urb() must be used to reliably + * kill the URBs. As it is unknown here, + * both orders must be used in turn. + * The call below is not redundant. + */ + usb_kill_urb(port->read_urb); usb_kill_urb(port->interrupt_in_urb); usb_kill_urb(port->interrupt_out_urb); } @@ -651,16 +662,14 @@ exit: static struct usb_serial_driver *search_serial_device(struct usb_interface *iface) { - struct list_head *p; const struct usb_device_id *id; - struct usb_serial_driver *t; + struct usb_serial_driver *drv; /* Check if the usb id matches a known device */ - list_for_each(p, &usb_serial_driver_list) { - t = list_entry(p, struct usb_serial_driver, driver_list); - id = get_iface_id(t, iface); + list_for_each_entry(drv, &usb_serial_driver_list, driver_list) { + id = get_iface_id(drv, iface); if (id) - return t; + return drv; } return NULL; @@ -800,9 +809,6 @@ int usb_serial_probe(struct usb_interface *interface, /* END HORRIBLE HACK FOR PL2303 */ #endif - /* found all that we need */ - dev_info(&interface->dev, "%s converter detected\n", type->description); - #ifdef CONFIG_USB_SERIAL_GENERIC if (type == &usb_serial_generic_device) { num_ports = num_bulk_out; @@ -836,6 +842,24 @@ int usb_serial_probe(struct usb_interface *interface, serial->num_interrupt_in = num_interrupt_in; serial->num_interrupt_out = num_interrupt_out; + /* check that the device meets the driver's requirements */ + if ((type->num_interrupt_in != NUM_DONT_CARE && + type->num_interrupt_in != num_interrupt_in) + || (type->num_interrupt_out != NUM_DONT_CARE && + type->num_interrupt_out != num_interrupt_out) + || (type->num_bulk_in != NUM_DONT_CARE && + type->num_bulk_in != num_bulk_in) + || (type->num_bulk_out != NUM_DONT_CARE && + type->num_bulk_out != num_bulk_out)) { + dbg("wrong number of endpoints"); + kfree(serial); + return -EIO; + } + + /* found all that we need */ + dev_info(&interface->dev, "%s converter detected\n", + type->description); + /* create our ports, we need as many as the max endpoints */ /* we don't use num_ports here cauz some devices have more endpoint pairs than ports */ max_endpoints = max(num_bulk_in, num_bulk_out); |