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path: root/drivers/net/usb/hso.c
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Diffstat (limited to 'drivers/net/usb/hso.c')
-rw-r--r--drivers/net/usb/hso.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 86292e6aaf49..1a482344b3f5 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -185,7 +185,6 @@ enum rx_ctrl_state{
#define BM_REQUEST_TYPE (0xa1)
#define B_NOTIFICATION (0x20)
#define W_VALUE (0x0)
-#define W_INDEX (0x2)
#define W_LENGTH (0x2)
#define B_OVERRUN (0x1<<6)
@@ -1487,6 +1486,7 @@ static void tiocmget_intr_callback(struct urb *urb)
struct uart_icount *icount;
struct hso_serial_state_notification *serial_state_notification;
struct usb_device *usb;
+ int if_num;
/* Sanity checks */
if (!serial)
@@ -1495,15 +1495,24 @@ static void tiocmget_intr_callback(struct urb *urb)
handle_usb_error(status, __func__, serial->parent);
return;
}
+
+ /* tiocmget is only supported on HSO_PORT_MODEM */
tiocmget = serial->tiocmget;
if (!tiocmget)
return;
+ BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
+
usb = serial->parent->usb;
+ if_num = serial->parent->interface->altsetting->desc.bInterfaceNumber;
+
+ /* wIndex should be the USB interface number of the port to which the
+ * notification applies, which should always be the Modem port.
+ */
serial_state_notification = &tiocmget->serial_state_notification;
if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
serial_state_notification->bNotification != B_NOTIFICATION ||
le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
- le16_to_cpu(serial_state_notification->wIndex) != W_INDEX ||
+ le16_to_cpu(serial_state_notification->wIndex) != if_num ||
le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
dev_warn(&usb->dev,
"hso received invalid serial state notification\n");
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