[PATCH v4] usb: ohci-at91: fix irq and iomem resource retrieval

[Boris BREZILLON]

When using dt resources retrieval (interrupts and reg properties) there is
no predefined order for these resources in the platform dev resources
table.

Retrieve resources using platform_get_resource and platform_get_irq
functions instead of direct resource table entries to avoid resource type
mismatch.

Signed-off-by: Boris BREZILLON <b.brezillon at overkiz.com>
Acked-by: Nicolas Ferre <nicolas.ferre at atmel.com>
Signed-off-by: Alan Stern <stern at rowland.harvard.edu>
Reviewed-by: Tomasz Figa <tomasz.figa at gmail.com>
---
Changes since v3:
 - replace platform_get_resource call with IORESOURCE_IRQ argument by
   platform_get_irq

Changes since v2:
 - split the patch series to isolate the urgent fix provided by this patch

Changes since v1:
 - none

 drivers/usb/host/ohci-at91.c |   26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 418444e..8c356af 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -136,23 +136,27 @@ static int usb_hcd_at91_probe(const struct hc_driver *driver,
 	struct ohci_hcd *ohci;
 	int retval;
 	struct usb_hcd *hcd = NULL;
-
-	if (pdev->num_resources != 2) {
-		pr_debug("hcd probe: invalid num_resources");
-		return -ENODEV;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	int irq;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_dbg(dev, "hcd probe: missing memory resource\n");
+		return -ENXIO;
 	}
 
-	if ((pdev->resource[0].flags != IORESOURCE_MEM)
-			|| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
-		pr_debug("hcd probe: invalid resource type\n");
-		return -ENODEV;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_dbg(dev, "hcd probe: missing irq resource\n");
+		return irq;
 	}
 
 	hcd = usb_create_hcd(driver, &pdev->dev, "at91");
 	if (!hcd)
 		return -ENOMEM;
-	hcd->rsrc_start = pdev->resource[0].start;
-	hcd->rsrc_len = resource_size(&pdev->resource[0]);
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
 
 	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 		pr_debug("request_mem_region failed\n");
@@ -199,7 +203,7 @@ static int usb_hcd_at91_probe(const struct hc_driver *driver,
 	ohci->num_ports = board->ports;
 	at91_start_hc(pdev);
 
-	retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
+	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (retval == 0)
 		return retval;
 
-- 
1.7.9.5