Allow drivers to specify a minimum number of endpoints per type, which
USB serial core will verify after subdriver probe has returned (where
the current alternate setting may have been changed).
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/usb-serial.c | 9 ++++++++-
include/linux/usb/serial.h | 9 +++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 3d8a6c7d34c1..63429b23335a 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -852,7 +852,14 @@ static int usb_serial_probe(struct usb_interface *interface,
}
/* END HORRIBLE HACK FOR PL2303 */
#endif
-
+ if (epds->num_bulk_in < type->num_bulk_in ||
+ epds->num_bulk_out < type->num_bulk_out ||
+ epds->num_interrupt_in < type->num_interrupt_in ||
+ epds->num_interrupt_out < type->num_interrupt_out) {
+ dev_err(ddev, "required endpoints missing\n");
+ retval = -ENODEV;
+ goto err_free_epds;
+ }
#ifdef CONFIG_USB_SERIAL_GENERIC
if (type == &usb_serial_generic_device) {
num_ports = epds->num_bulk_out;
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index ee4394d8932f..f1b8a8493762 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -188,6 +188,10 @@ static inline void usb_set_serial_data(struct usb_serial *serial, void *data)
* @id_table: pointer to a list of usb_device_id structures that define all
* of the devices this structure can support.
* @num_ports: the number of different ports this device will have.
+ * @num_bulk_in: minimum number of bulk-in endpoints
+ * @num_bulk_out: minimum number of bulk-out endpoints
+ * @num_interrupt_in: minimum number of interrupt-in endpoints
+ * @num_interrupt_out: minimum number of interrupt-out endpoints
* @bulk_in_size: minimum number of bytes to allocate for bulk-in buffer
* (0 = end-point size)
* @bulk_out_size: bytes to allocate for bulk-out buffer (0 = end-point size)
@@ -235,6 +239,11 @@ struct usb_serial_driver {
unsigned char num_ports;
+ unsigned char num_bulk_in;
+ unsigned char num_bulk_out;
+ unsigned char num_interrupt_in;
+ unsigned char num_interrupt_out;
+
size_t bulk_in_size;
size_t bulk_out_size;
--
2.12.0
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