Patch "r8152: search the configuration of vendor mode" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    r8152: search the configuration of vendor mode

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     r8152-search-the-configuration-of-vendor-mode.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 999a10cbab78406a4fa45870dde04d0e7b7c66c5
Author: Hayes Wang <hayeswang@xxxxxxxxxxx>
Date:   Fri Apr 16 16:04:37 2021 +0800

    r8152: search the configuration of vendor mode
    
    [ Upstream commit c2198943e33b100ed21dfb636c8fa6baef841e9d ]
    
    The vendor mode is not always at config #1, so it is necessary to
    set the correct configuration number.
    
    Signed-off-by: Hayes Wang <hayeswang@xxxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 0d6f10c9bb139..170b6ec2dbb3c 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -28,7 +28,7 @@
 #include <crypto/hash.h>
 
 /* Information for net-next */
-#define NETNEXT_VERSION		"11"
+#define NETNEXT_VERSION		"12"
 
 /* Information for net */
 #define NET_VERSION		"11"
@@ -5580,6 +5580,39 @@ static void r8153b_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);
@@ -6673,10 +6706,8 @@ 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;