From 33fb934a0992440e3d645d3965e71217c185fd6d Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Mon, 5 Jul 2021 10:20:14 +0200
Subject: [PATCH] USB: serial: cp210x: clean up type detection
Git-commit: 33fb934a0992440e3d645d3965e71217c185fd6d
References: git-fixes
Patch-mainline: v5.15-rc1

Clean up attach somewhat by moving type detection into the quirk helper
and giving it a more generic name.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/serial/cp210x.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index c19073ae3891..a120646b0926 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -2092,11 +2092,21 @@ static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
 	return 0;
 }
 
-static void cp210x_determine_quirks(struct usb_serial *serial)
+static void cp210x_determine_type(struct usb_serial *serial)
 {
 	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
 	int ret;
 
+	ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
+			CP210X_GET_PARTNUM, &priv->partnum,
+			sizeof(priv->partnum));
+	if (ret < 0) {
+		dev_warn(&serial->interface->dev,
+				"querying part number failed\n");
+		priv->partnum = CP210X_PARTNUM_UNKNOWN;
+		return;
+	}
+
 	switch (priv->partnum) {
 	case CP210X_PARTNUM_CP2102N_QFN28:
 	case CP210X_PARTNUM_CP2102N_QFN24:
@@ -2121,18 +2131,9 @@ static int cp210x_attach(struct usb_serial *serial)
 	if (!priv)
 		return -ENOMEM;
 
-	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
-					  CP210X_GET_PARTNUM, &priv->partnum,
-					  sizeof(priv->partnum));
-	if (result < 0) {
-		dev_warn(&serial->interface->dev,
-			 "querying part number failed\n");
-		priv->partnum = CP210X_PARTNUM_UNKNOWN;
-	}
-
 	usb_set_serial_data(serial, priv);
 
-	cp210x_determine_quirks(serial);
+	cp210x_determine_type(serial);
 	cp210x_init_max_speed(serial);
 
 	result = cp210x_gpio_init(serial);
-- 
2.26.2