[PATCH net-next 6/6] r8152: search the configuration of vendor mode

[Hayes Wang]

The vendor mode is not always at config #1, so it is necessary to
set the correct configuration number.

Signed-off-by: Hayes Wang <hayesw...@realtek.com>
---
 drivers/net/usb/r8152.c | 39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 34c1ee61af01..9119a860e9bd 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -29,7 +29,7 @@
 #include <linux/usb/r8152.h>
 
 /* Information for net-next */
-#define NETNEXT_VERSION                "11"
+#define NETNEXT_VERSION                "12"
 
 /* Information for net */
 #define NET_VERSION            "11"
@@ -8107,6 +8107,39 @@ static void r8156b_init(struct r8152 *tp)
        tp->coalesce = 15000;   /* 15 us */
 }
 
+static bool rtl_vendor_mode(struct usb_interface *intf)
+{
+       struct usb_host_interface *alt = intf->cur_altsetting;
+       struct usb_device *udev;
+       struct usb_host_config *c;
+       int i, num_configs;
+
+       if (alt->desc.bInterfaceClass == USB_CLASS_VENDOR_SPEC)
+               return true;
+
+       /* The vendor mode is not always config #1, so to find it out. */
+       udev = interface_to_usbdev(intf);
+       c = udev->config;
+       num_configs = udev->descriptor.bNumConfigurations;
+       for (i = 0; i < num_configs; (i++, c++)) {
+               struct usb_interface_descriptor *desc = NULL;
+
+               if (c->desc.bNumInterfaces > 0)
+                       desc = &c->intf_cache[0]->altsetting->desc;
+               else
+                       continue;
+
+               if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC) {
+                       usb_driver_set_configuration(udev, 
c->desc.bConfigurationValue);
+                       break;
+               }
+       }
+
+       WARN_ON_ONCE(i == num_configs);
+
+       return false;
+}
+
 static int rtl8152_pre_reset(struct usb_interface *intf)
 {
        struct r8152 *tp = usb_get_intfdata(intf);
@@ -9345,10 +9378,8 @@ static int rtl8152_probe(struct usb_interface *intf,
        if (version == RTL_VER_UNKNOWN)
                return -ENODEV;
 
-       if (udev->actconfig->desc.bConfigurationValue != 1) {
-               usb_driver_set_configuration(udev, 1);
+       if (!rtl_vendor_mode(intf))
                return -ENODEV;
-       }
 
        if (intf->cur_altsetting->desc.bNumEndpoints < 3)
                return -ENODEV;
-- 
2.26.3