media: iguanair: rc drivers no longer need to do locking

Since commit 4957133f ("media: lirc: improve locking"), drivers
do not need to do any of their own locking.

During suspend and resume, no processes are running so no locking is
needed.
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/rc/iguanair.c

@@ -14,7 +14,6 @@
 #include <linux/completion.h>
 #include <media/rc-core.h>
 
-#define DRIVER_NAME "iguanair"
 #define BUF_SIZE 152
 
 struct iguanair {
@@ -27,8 +26,6 @@ struct iguanair {
 	uint8_t bufsize;
 	uint8_t cycle_overhead;
 
-	struct mutex lock;
-
 	/* receiver support */
 	bool receiver_on;
 	dma_addr_t dma_in, dma_out;
@@ -284,8 +281,6 @@ static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
 	if (carrier < 25000 || carrier > 150000)
 		return -EINVAL;
 
-	mutex_lock(&ir->lock);
-
 	if (carrier != ir->carrier) {
 		uint32_t cycles, fours, sevens;
 
@@ -314,8 +309,6 @@ static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
 		ir->packet->busy4 = 110 - fours;
 	}
 
-	mutex_unlock(&ir->lock);
-
 	return 0;
 }
 
@@ -326,9 +319,7 @@ static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
 	if (mask > 15)
 		return 4;
 
-	mutex_lock(&ir->lock);
 	ir->packet->channels = mask << 4;
-	mutex_unlock(&ir->lock);
 
 	return 0;
 }
@@ -339,8 +330,6 @@ static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
 	unsigned int i, size, p, periods;
 	int rc;
 
-	mutex_lock(&ir->lock);
-
 	/* convert from us to carrier periods */
 	for (i = size = 0; i < count; i++) {
 		periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
@@ -368,8 +357,6 @@ static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
 		rc = -EOVERFLOW;
 
 out:
-	mutex_unlock(&ir->lock);
-
 	return rc ? rc : count;
 }
 
@@ -378,14 +365,10 @@ static int iguanair_open(struct rc_dev *rdev)
 	struct iguanair *ir = rdev->priv;
 	int rc;
 
-	mutex_lock(&ir->lock);
-
 	rc = iguanair_receiver(ir, true);
 	if (rc == 0)
 		ir->receiver_on = true;
 
-	mutex_unlock(&ir->lock);
-
 	return rc;
 }
 
@@ -394,14 +377,10 @@ static void iguanair_close(struct rc_dev *rdev)
 	struct iguanair *ir = rdev->priv;
 	int rc;
 
-	mutex_lock(&ir->lock);
-
 	rc = iguanair_receiver(ir, false);
 	ir->receiver_on = false;
 	if (rc && rc != -ENODEV)
 		dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
-
-	mutex_unlock(&ir->lock);
 }
 
 static int iguanair_probe(struct usb_interface *intf,
@@ -441,7 +420,6 @@ static int iguanair_probe(struct usb_interface *intf,
 	ir->rc = rc;
 	ir->dev = &intf->dev;
 	ir->udev = udev;
-	mutex_init(&ir->lock);
 
 	init_completion(&ir->completion);
 	pipeout = usb_sndintpipe(udev,
@@ -483,7 +461,7 @@ static int iguanair_probe(struct usb_interface *intf,
 	rc->s_tx_mask = iguanair_set_tx_mask;
 	rc->s_tx_carrier = iguanair_set_tx_carrier;
 	rc->tx_ir = iguanair_tx;
-	rc->driver_name = DRIVER_NAME;
+	rc->driver_name = KBUILD_MODNAME;
 	rc->map_name = RC_MAP_RC6_MCE;
 	rc->min_timeout = 1;
 	rc->timeout = IR_DEFAULT_TIMEOUT;
@@ -538,8 +516,6 @@ static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
 	struct iguanair *ir = usb_get_intfdata(intf);
 	int rc = 0;
 
-	mutex_lock(&ir->lock);
-
 	if (ir->receiver_on) {
 		rc = iguanair_receiver(ir, false);
 		if (rc)
@@ -549,17 +525,13 @@ static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
 	usb_kill_urb(ir->urb_in);
 	usb_kill_urb(ir->urb_out);
 
-	mutex_unlock(&ir->lock);
-
 	return rc;
 }
 
 static int iguanair_resume(struct usb_interface *intf)
 {
 	struct iguanair *ir = usb_get_intfdata(intf);
-	int rc = 0;
-
-	mutex_lock(&ir->lock);
+	int rc;
 
 	rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
 	if (rc)
@@ -571,8 +543,6 @@ static int iguanair_resume(struct usb_interface *intf)
 			dev_warn(ir->dev, "failed to enable receiver after resume\n");
 	}
 
-	mutex_unlock(&ir->lock);
-
 	return rc;
 }
 
@@ -582,7 +552,7 @@ static const struct usb_device_id iguanair_table[] = {
 };
 
 static struct usb_driver iguanair_driver = {
-	.name =	DRIVER_NAME,
+	.name =	KBUILD_MODNAME,
 	.probe = iguanair_probe,
 	.disconnect = iguanair_disconnect,
 	.suspend = iguanair_suspend,