usb: core: hcd: make hcd->irq unsigned

There's really no point in having hcd->irq as a
signed integer when we consider the fact that
IRQ 0 means NO_IRQ. In order to avoid confusion,
make hcd->irq unsigned and fix users who were
passing -1 as the IRQ number to usb_add_hcd.

Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/hcd.c

@@ -2352,7 +2352,7 @@ static int usb_hcd_request_irqs(struct usb_hcd *hcd,
 					"io mem" : "io base",
 					(unsigned long long)hcd->rsrc_start);
 	} else {
-		hcd->irq = -1;
+		hcd->irq = 0;
 		if (hcd->rsrc_start)
 			dev_info(hcd->self.controller, "%s 0x%08llx\n",
 					(hcd->driver->flags & HCD_MEMORY) ?
@@ -2508,7 +2508,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 	del_timer_sync(&hcd->rh_timer);
 err_hcd_driver_start:
-	if (usb_hcd_is_primary_hcd(hcd) && hcd->irq >= 0)
+	if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
 		free_irq(irqnum, hcd);
 err_request_irq:
 err_hcd_driver_setup:
@@ -2573,7 +2573,7 @@ void usb_remove_hcd(struct usb_hcd *hcd)
 	del_timer_sync(&hcd->rh_timer);
 
 	if (usb_hcd_is_primary_hcd(hcd)) {
-		if (hcd->irq >= 0)
+		if (hcd->irq > 0)
 			free_irq(hcd->irq, hcd);
 	}
 

drivers/usb/host/ohci-hcd.c

@@ -899,7 +899,7 @@ static void ohci_stop (struct usb_hcd *hcd)
 	ohci_usb_reset (ohci);
 	ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 	free_irq(hcd->irq, hcd);
-	hcd->irq = -1;
+	hcd->irq = 0;
 
 	if (quirk_zfmicro(ohci))
 		del_timer(&ohci->unlink_watchdog);

drivers/usb/host/xhci-ring.c

@@ -2396,7 +2396,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
 	/* FIXME when MSI-X is supported and there are multiple vectors */
 	/* Clear the MSI-X event interrupt status */
 
-	if (hcd->irq != -1) {
+	if (hcd->irq) {
 		u32 irq_pending;
 		/* Acknowledge the PCI interrupt */
 		irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);

drivers/usb/host/xhci.c

@@ -224,13 +224,13 @@ static void xhci_free_irq(struct xhci_hcd *xhci)
 	int ret;
 
 	/* return if using legacy interrupt */
-	if (xhci_to_hcd(xhci)->irq >= 0)
+	if (xhci_to_hcd(xhci)->irq > 0)
 		return;
 
 	ret = xhci_free_msi(xhci);
 	if (!ret)
 		return;
-	if (pdev->irq >= 0)
+	if (pdev->irq > 0)
 		free_irq(pdev->irq, xhci_to_hcd(xhci));
 
 	return;
@@ -341,7 +341,7 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
 	/* unregister the legacy interrupt */
 	if (hcd->irq)
 		free_irq(hcd->irq, hcd);
-	hcd->irq = -1;
+	hcd->irq = 0;
 
 	ret = xhci_setup_msix(xhci);
 	if (ret)
@@ -349,7 +349,7 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
 		ret = xhci_setup_msi(xhci);
 
 	if (!ret)
-		/* hcd->irq is -1, we have MSI */
+		/* hcd->irq is 0, we have MSI */
 		return 0;
 
 	if (!pdev->irq) {

drivers/usb/musb/musb_core.c

@@ -1987,7 +1987,7 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
 		musb->xceiv->otg->default_a = 1;
 		musb->xceiv->state = OTG_STATE_A_IDLE;
 
-		status = usb_add_hcd(musb_to_hcd(musb), -1, 0);
+		status = usb_add_hcd(musb_to_hcd(musb), 0, 0);
 
 		hcd->self.uses_pio_for_control = 1;
 		dev_dbg(musb->controller, "%s mode, status %d, devctl %02x %c\n",

drivers/usb/musb/musb_gadget.c

@@ -1957,7 +1957,7 @@ static int musb_gadget_start(struct usb_gadget *g,
 		 * handles power budgeting ... this way also
 		 * ensures HdrcStart is indirectly called.
 		 */
-		retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
+		retval = usb_add_hcd(musb_to_hcd(musb), 0, 0);
 		if (retval < 0) {
 			dev_dbg(musb->controller, "add_hcd failed, %d\n", retval);
 			goto err2;

include/linux/usb/hcd.h

@@ -127,7 +127,7 @@ struct usb_hcd {
 	unsigned		authorized_default:1;
 	unsigned		has_tt:1;	/* Integrated TT in root hub */
 
-	int			irq;		/* irq allocated */
+	unsigned int		irq;		/* irq allocated */
 	void __iomem		*regs;		/* device memory/io */
 	u64			rsrc_start;	/* memory/io resource start */
 	u64			rsrc_len;	/* memory/io resource length */