usb: dwc3: gadget: introduce dwc3_process_event_buf

in order to make our IRQ handler thread easier
to read, we re-factor the inner loop to a separate
function.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/gadget.c

@@ -2442,25 +2442,18 @@ static void dwc3_process_event_entry(struct dwc3 *dwc,
 	}
 }
 
-static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
+static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
 {
-	struct dwc3 *dwc = _dwc;
-	unsigned long flags;
-	irqreturn_t ret = IRQ_NONE;
-	u32 reg;
-	int i;
-
-	spin_lock_irqsave(&dwc->lock, flags);
-
-	for (i = 0; i < dwc->num_event_buffers; i++) {
 	struct dwc3_event_buffer *evt;
+	irqreturn_t ret = IRQ_NONE;
 	int left;
+	u32 reg;
 
-		evt = dwc->ev_buffs[i];
+	evt = dwc->ev_buffs[buf];
 	left = evt->count;
 
 	if (!(evt->flags & DWC3_EVENT_PENDING))
-			continue;
+		return IRQ_NONE;
 
 	while (left > 0) {
 		union dwc3_event event;
@@ -2481,7 +2474,7 @@ static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
 		evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
 		left -= 4;
 
-			dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(i), 4);
+		dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
 	}
 
 	evt->count = 0;
@@ -2489,10 +2482,24 @@ static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
 	ret = IRQ_HANDLED;
 
 	/* Unmask interrupt */
-		reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(i));
+	reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
 	reg &= ~DWC3_GEVNTSIZ_INTMASK;
-		dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(i), reg);
-	}
+	dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
+
+	return ret;
+}
+
+static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
+{
+	struct dwc3 *dwc = _dwc;
+	unsigned long flags;
+	irqreturn_t ret = IRQ_NONE;
+	int i;
+
+	spin_lock_irqsave(&dwc->lock, flags);
+
+	for (i = 0; i < dwc->num_event_buffers; i++)
+		ret |= dwc3_process_event_buf(dwc, i);
 
 	spin_unlock_irqrestore(&dwc->lock, flags);