Input: touchscreen - use sizeof(*pointer) instead of sizeof(type)

It is preferred to use sizeof(*pointer) instead of sizeof(type)
due to the type of the variable can change and one needs not
change the former (unlike the latter).

The refactoring is mostly trivial except for "usbtouchscreen.c"
file. Here, in the "mtouch_alloc" and "nexio_alloc" functions,
it is necessary to use a variable with a predefined type instead
of the "usbtouch->priv" variable (void * type). This way, the
"sizeof" operator can now know the correct size. Moreover, we
need to set the "usbtouch->priv" pointer after the memory
allocation since now the "kmalloc" return value is not assigned
directly.

This patch has no effect on runtime behavior.

Signed-off-by: Erick Archer <erick.archer@outlook.com>
Link: https://lore.kernel.org/r/AS8PR02MB723708364CC0DF2EAAFEE5968BC42@AS8PR02MB7237.eurprd02.prod.outlook.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/da9052_tsi.c

@@ -232,7 +232,7 @@ static int da9052_ts_probe(struct platform_device *pdev)
 	if (!da9052)
 		return -EINVAL;
 
-	tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
+	tsi = kzalloc(sizeof(*tsi), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!tsi || !input_dev) {
 		error = -ENOMEM;

drivers/input/touchscreen/dynapro.c

@@ -110,7 +110,7 @@ static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
+	pdynapro = kzalloc(sizeof(*pdynapro), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!pdynapro || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/egalax_ts_serial.c

@@ -99,7 +99,7 @@ static int egalax_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int error;
 
-	egalax = kzalloc(sizeof(struct egalax), GFP_KERNEL);
+	egalax = kzalloc(sizeof(*egalax), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!egalax || !input_dev) {
 		error = -ENOMEM;

drivers/input/touchscreen/elo.c

@@ -307,7 +307,7 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
+	elo = kzalloc(sizeof(*elo), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!elo || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/fujitsu_ts.c

@@ -99,7 +99,7 @@ static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
+	fujitsu = kzalloc(sizeof(*fujitsu), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!fujitsu || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/gunze.c

@@ -97,7 +97,7 @@ static int gunze_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
+	gunze = kzalloc(sizeof(*gunze), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!gunze || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/hampshire.c

@@ -109,7 +109,7 @@ static int hampshire_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	phampshire = kzalloc(sizeof(struct hampshire), GFP_KERNEL);
+	phampshire = kzalloc(sizeof(*phampshire), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!phampshire || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/inexio.c

@@ -114,7 +114,7 @@ static int inexio_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
+	pinexio = kzalloc(sizeof(*pinexio), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!pinexio || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/mtouch.c

@@ -128,7 +128,7 @@ static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
+	mtouch = kzalloc(sizeof(*mtouch), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!mtouch || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/penmount.c

@@ -199,7 +199,7 @@ static int pm_connect(struct serio *serio, struct serio_driver *drv)
 	int max_x, max_y;
 	int err;
 
-	pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
+	pm = kzalloc(sizeof(*pm), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!pm || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/sur40.c

@@ -672,7 +672,7 @@ static int sur40_probe(struct usb_interface *interface,
 		return -ENODEV;
 
 	/* Allocate memory for our device state and initialize it. */
-	sur40 = kzalloc(sizeof(struct sur40_state), GFP_KERNEL);
+	sur40 = kzalloc(sizeof(*sur40), GFP_KERNEL);
 	if (!sur40)
 		return -ENOMEM;
 

drivers/input/touchscreen/touchit213.c

@@ -139,7 +139,7 @@ static int touchit213_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	touchit213 = kzalloc(sizeof(struct touchit213), GFP_KERNEL);
+	touchit213 = kzalloc(sizeof(*touchit213), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!touchit213 || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/touchright.c

@@ -102,7 +102,7 @@ static int tr_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
+	tr = kzalloc(sizeof(*tr), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!tr || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/touchwin.c

@@ -109,7 +109,7 @@ static int tw_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int err;
 
-	tw = kzalloc(sizeof(struct tw), GFP_KERNEL);
+	tw = kzalloc(sizeof(*tw), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!tw || !input_dev) {
 		err = -ENOMEM;

drivers/input/touchscreen/tsc40.c

@@ -83,7 +83,7 @@ static int tsc_connect(struct serio *serio, struct serio_driver *drv)
 	struct input_dev *input_dev;
 	int error;
 
-	ptsc = kzalloc(sizeof(struct tsc_ser), GFP_KERNEL);
+	ptsc = kzalloc(sizeof(*ptsc), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!ptsc || !input_dev) {
 		error = -ENOMEM;

drivers/input/touchscreen/usbtouchscreen.c

@@ -505,12 +505,14 @@ free:
 
 static int mtouch_alloc(struct usbtouch_usb *usbtouch)
 {
+	struct mtouch_priv *priv;
 	int ret;
 
-	usbtouch->priv = kmalloc(sizeof(struct mtouch_priv), GFP_KERNEL);
+	priv = kmalloc(sizeof(*priv), GFP_KERNEL);
-	if (!usbtouch->priv)
+	if (!priv)
 		return -ENOMEM;
 
+	usbtouch->priv = priv;
 	ret = sysfs_create_group(&usbtouch->interface->dev.kobj,
 				 &mtouch_attr_group);
 	if (ret) {
@@ -924,12 +926,11 @@ static int nexio_alloc(struct usbtouch_usb *usbtouch)
 	struct nexio_priv *priv;
 	int ret = -ENOMEM;
 
-	usbtouch->priv = kmalloc(sizeof(struct nexio_priv), GFP_KERNEL);
+	priv = kmalloc(sizeof(*priv), GFP_KERNEL);
-	if (!usbtouch->priv)
+	if (!priv)
 		goto out_buf;
 
-	priv = usbtouch->priv;
+	usbtouch->priv = priv;
-
 	priv->ack_buf = kmemdup(nexio_ack_pkt, sizeof(nexio_ack_pkt),
 				GFP_KERNEL);
 	if (!priv->ack_buf)
@@ -1661,7 +1662,7 @@ static int usbtouch_probe(struct usb_interface *intf,
 	if (!endpoint)
 		return -ENXIO;
 
-	usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
+	usbtouch = kzalloc(sizeof(*usbtouch), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!usbtouch || !input_dev)
 		goto out_free;

drivers/input/touchscreen/wacom_w8001.c

@@ -598,7 +598,7 @@ static int w8001_connect(struct serio *serio, struct serio_driver *drv)
 	char basename[64] = "Wacom Serial";
 	int err, err_pen, err_touch;
 
-	w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
+	w8001 = kzalloc(sizeof(*w8001), GFP_KERNEL);
 	input_dev_pen = input_allocate_device();
 	input_dev_touch = input_allocate_device();
 	if (!w8001 || !input_dev_pen || !input_dev_touch) {