target/linux/generic/backport-6.1/795-v6.3-05-r8152-reduce-the-control-transfer-of-rtl8152_get_ver.patch

   1 From 02767440e1dda9861a11ca1dbe0f19a760b1d5c2 Mon Sep 17 00:00:00 2001
   2 From: Hayes Wang <hayeswang@realtek.com>
   3 Date: Thu, 19 Jan 2023 15:40:43 +0800
   4 Subject: [PATCH] r8152: reduce the control transfer of rtl8152_get_version()
   5
   6 Reduce the control transfer by moving calling rtl8152_get_version() in
   7 rtl8152_probe(). This could prevent from calling rtl8152_get_version()
   8 for unnecessary situations. For example, after setting config #2 for the
   9 device, there are two interfaces and rtl8152_probe() may be called
  10 twice. However, we don't need to call rtl8152_get_version() for this
  11 situation.
  12
  13 Signed-off-by: Hayes Wang <hayeswang@realtek.com>
  14 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  15 ---
  16  drivers/net/usb/r8152.c | 9 +++++----
  17  1 file changed, 5 insertions(+), 4 deletions(-)
  18
  19 --- a/drivers/net/usb/r8152.c
  20 +++ b/drivers/net/usb/r8152.c
  21 @@ -9638,20 +9638,21 @@ static int rtl8152_probe(struct usb_inte
  22                          const struct usb_device_id *id)
  23  {
  24         struct usb_device *udev = interface_to_usbdev(intf);
  25 -       u8 version = rtl8152_get_version(intf);
  26         struct r8152 *tp;
  27         struct net_device *netdev;
  28 +       u8 version;
  29         int ret;
  30
  31 -       if (version == RTL_VER_UNKNOWN)
  32 -               return -ENODEV;
  33 -
  34         if (intf->cur_altsetting->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
  35                 return -ENODEV;
  36
  37         if (!rtl_check_vendor_ok(intf))
  38                 return -ENODEV;
  39
  40 +       version = rtl8152_get_version(intf);
  41 +       if (version == RTL_VER_UNKNOWN)
  42 +               return -ENODEV;
  43 +
  44         usb_reset_device(udev);
  45         netdev = alloc_etherdev(sizeof(struct r8152));
  46         if (!netdev) {