netdev - [PATCH net-next 2/2] r8152: reduce the control transfer of rtl8152_get

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Date:   Thu, 19 Jan 2023 15:40:43 +0800
From:   Hayes Wang <hayeswang@...ltek.com>
To:     <kuba@...nel.org>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <nic_swsd@...ltek.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <edumazet@...gle.com>, <pabeni@...hat.com>,
        Hayes Wang <hayeswang@...ltek.com>
Subject: [PATCH net-next 2/2] r8152: reduce the control transfer of rtl8152_get_version()

Reduce the control transfer by moving calling rtl8152_get_version() in
rtl8152_probe(). This could prevent from calling rtl8152_get_version()
for unnecessary situations. For example, after setting config #2 for the
device, there are two interfaces and rtl8152_probe() may be called
twice. However, we don't need to call rtl8152_get_version() for this
situation.

Signed-off-by: Hayes Wang <hayeswang@...ltek.com>
---
 drivers/net/usb/r8152.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 6e5e12d90d47..decb5ba56a25 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -9581,20 +9581,21 @@ static int rtl8152_probe(struct usb_interface *intf,
 			 const struct usb_device_id *id)
 {
 	struct usb_device *udev = interface_to_usbdev(intf);
-	u8 version = rtl8152_get_version(intf);
 	struct r8152 *tp;
 	struct net_device *netdev;
+	u8 version;
 	int ret;
 
-	if (version == RTL_VER_UNKNOWN)
-		return -ENODEV;
-
 	if (intf->cur_altsetting->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
 		return -ENODEV;
 
 	if (!rtl_check_vendor_ok(intf))
 		return -ENODEV;
 
+	version = rtl8152_get_version(intf);
+	if (version == RTL_VER_UNKNOWN)
+		return -ENODEV;
+
 	usb_reset_device(udev);
 	netdev = alloc_etherdev(sizeof(struct r8152));
 	if (!netdev) {
-- 
2.38.1