usb: dwc3: core: drop DWC3_EVENT_BUFFERS_MAX

hardware will tell us how many event buffers we
need to support, so let's allocate the array
dynamically too.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.c

@@ -221,6 +221,12 @@ static int __devinit dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)
 	num = DWC3_NUM_INT(dwc->hwparams.hwparams1);
 	dwc->num_event_buffers = num;
 
+	dwc->ev_buffs = kzalloc(sizeof(*dwc->ev_buffs) * num, GFP_KERNEL);
+	if (!dwc->ev_buffs) {
+		dev_err(dwc->dev, "can't allocate event buffers array\n");
+		return -ENOMEM;
+	}
+
 	for (i = 0; i < num; i++) {
 		struct dwc3_event_buffer	*evt;
 

drivers/usb/dwc3/core.h

@@ -53,7 +53,6 @@
 /* Global constants */
 #define DWC3_ENDPOINTS_NUM	32
 
-#define DWC3_EVENT_BUFFERS_MAX	2
 #define DWC3_EVENT_BUFFERS_SIZE	PAGE_SIZE
 #define DWC3_EVENT_TYPE_MASK	0xfe
 
@@ -603,7 +602,7 @@ struct dwc3 {
 	struct platform_device	*xhci;
 	struct resource		*res;
 
-	struct dwc3_event_buffer *ev_buffs[DWC3_EVENT_BUFFERS_MAX];
+	struct dwc3_event_buffer **ev_buffs;
 	struct dwc3_ep		*eps[DWC3_ENDPOINTS_NUM];
 
 	struct usb_gadget	gadget;