linux-kernel - [PATCH 6/7] net: huawei_cdc_ncm: add usbnet -> priv function

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Date:   Fri, 12 Oct 2018 10:16:41 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel@...ts.codethink.co.uk, gregkh@...uxfoundation.org,
        bjorn@...k.no, steve.glendinning@...well.net,
        Ben Dooks <ben.dooks@...ethink.co.uk>
Subject: [PATCH 6/7] net: huawei_cdc_ncm: add usbnet -> priv function

There are a number of places in the huawei driver where it gets the
private-data from the usbnet passed in. It would be sensible to have
one inline function to convert it and change all points in the driver
to use that.

Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
---
---
 drivers/net/usb/huawei_cdc_ncm.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/usb/huawei_cdc_ncm.c b/drivers/net/usb/huawei_cdc_ncm.c
index 63f28908afda..d290b8c318be 100644
--- a/drivers/net/usb/huawei_cdc_ncm.c
+++ b/drivers/net/usb/huawei_cdc_ncm.c
@@ -38,9 +38,14 @@ struct huawei_cdc_ncm_state {
 	struct usb_interface *data;
 };
 
+static inline struct huawei_cdc_ncm_state *usbnet_to_state(struct usbnet *usb)
+{
+	return (struct huawei_cdc_ncm_state *)&usb->data;
+}
+
 static int huawei_cdc_ncm_manage_power(struct usbnet *usbnet_dev, int on)
 {
-	struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data;
+	struct huawei_cdc_ncm_state *drvstate = usbnet_to_state(usbnet_dev);
 	int rv;
 
 	if ((on && atomic_add_return(1, &drvstate->pmcount) == 1) ||
@@ -72,7 +77,7 @@ static int huawei_cdc_ncm_bind(struct usbnet *usbnet_dev,
 	struct cdc_ncm_ctx *ctx;
 	struct usb_driver *subdriver = ERR_PTR(-ENODEV);
 	int ret = -ENODEV;
-	struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data;
+	struct huawei_cdc_ncm_state *drvstate = usbnet_to_state(usbnet_dev);
 	int drvflags = 0;
 
 	/* altsetting should always be 1 for NCM devices - so we hard-coded
@@ -119,7 +124,7 @@ static int huawei_cdc_ncm_bind(struct usbnet *usbnet_dev,
 static void huawei_cdc_ncm_unbind(struct usbnet *usbnet_dev,
 				  struct usb_interface *intf)
 {
-	struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data;
+	struct huawei_cdc_ncm_state *drvstate = usbnet_to_state(usbnet_dev);
 	struct cdc_ncm_ctx *ctx = drvstate->ctx;
 
 	if (drvstate->subdriver && drvstate->subdriver->disconnect)
@@ -134,7 +139,7 @@ static int huawei_cdc_ncm_suspend(struct usb_interface *intf,
 {
 	int ret = 0;
 	struct usbnet *usbnet_dev = usb_get_intfdata(intf);
-	struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data;
+	struct huawei_cdc_ncm_state *drvstate = usbnet_to_state(usbnet_dev);
 	struct cdc_ncm_ctx *ctx = drvstate->ctx;
 
 	if (ctx == NULL) {
@@ -161,7 +166,7 @@ static int huawei_cdc_ncm_resume(struct usb_interface *intf)
 {
 	int ret = 0;
 	struct usbnet *usbnet_dev = usb_get_intfdata(intf);
-	struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data;
+	struct huawei_cdc_ncm_state *drvstate = usbnet_to_state(usbnet_dev);
 	bool callsub;
 	struct cdc_ncm_ctx *ctx = drvstate->ctx;
 
-- 
2.19.1