staging: dwc2: use irq_return_t for interrupt handlers

The top-level hcd interrupt handlers already used irq_return_t, but the
functions to which it delegates the actual work and the common irq
handler returned plain ints. In addition, they used the IRQ_RETVAL in
the wrong way (but because of the values of the various constants, this
didn't result in wrong behaviour).

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
[matthijs@stdin.nl: Split patch from bigger patch and added commit message]
Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dwc2/core_intr.c

@@ -450,7 +450,7 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 {
 	struct dwc2_hsotg *hsotg = dev;
 	u32 gintsts;
-	int retval = 0;
+	irqreturn_t retval = IRQ_NONE;
 
 	if (dwc2_check_core_status(hsotg) < 0) {
 		dev_warn(hsotg->dev, "Controller is disconnected\n");
@@ -461,7 +461,7 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 
 	gintsts = dwc2_read_common_intr(hsotg);
 	if (gintsts & ~GINTSTS_PRTINT)
-		retval = 1;
+		retval = IRQ_HANDLED;
 
 	if (gintsts & GINTSTS_MODEMIS)
 		dwc2_handle_mode_mismatch_intr(hsotg);
@@ -500,6 +500,6 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 
 	spin_unlock(&hsotg->lock);
 out:
-	return IRQ_RETVAL(retval);
+	return retval;
 }
 EXPORT_SYMBOL_GPL(dwc2_handle_common_intr);

drivers/staging/dwc2/hcd.c

@@ -2533,9 +2533,8 @@ static void _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd,
 static irqreturn_t _dwc2_hcd_irq(struct usb_hcd *hcd)
 {
 	struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
-	int retval = dwc2_hcd_intr(hsotg);
 
-	return IRQ_RETVAL(retval);
+	return dwc2_hcd_intr(hsotg);
 }
 
 /*

drivers/staging/dwc2/hcd.h

@@ -650,10 +650,10 @@ extern void dwc2_hcd_save_data_toggle(struct dwc2_hsotg *hsotg,
  *
  * @hsotg: The DWC2 HCD
  *
- * Returns non zero if interrupt is handled
- * Return 0 if interrupt is not handled
+ * Returns IRQ_HANDLED if interrupt is handled
+ * Return IRQ_NONE if interrupt is not handled
  */
-extern int dwc2_hcd_intr(struct dwc2_hsotg *hsotg);
+extern irqreturn_t dwc2_hcd_intr(struct dwc2_hsotg *hsotg);
 
 /**
  * dwc2_hcd_stop() - Halts the DWC_otg host mode operation

drivers/staging/dwc2/hcd_intr.c

@@ -2062,14 +2062,14 @@ static void dwc2_hc_intr(struct dwc2_hsotg *hsotg)
 }
 
 /* This function handles interrupts for the HCD */
-int dwc2_hcd_intr(struct dwc2_hsotg *hsotg)
+irqreturn_t dwc2_hcd_intr(struct dwc2_hsotg *hsotg)
 {
 	u32 gintsts, dbg_gintsts;
-	int retval = 0;
+	irqreturn_t retval = IRQ_NONE;
 
 	if (dwc2_check_core_status(hsotg) < 0) {
 		dev_warn(hsotg->dev, "Controller is disconnected\n");
-		return 0;
+		return retval;
 	}
 
 	spin_lock(&hsotg->lock);
@@ -2079,10 +2079,10 @@ int dwc2_hcd_intr(struct dwc2_hsotg *hsotg)
 		gintsts = dwc2_read_core_intr(hsotg);
 		if (!gintsts) {
 			spin_unlock(&hsotg->lock);
-			return 0;
+			return retval;
 		}
 
-		retval = 1;
+		retval = IRQ_HANDLED;
 
 		dbg_gintsts = gintsts;
 #ifndef DEBUG_SOF