usb: dwc3: define DWC3_EP0_BOUNCE_SIZE

to avoid sprinkling magic constants on the driver
we define a constant to be used when allocating
setup_buffer and ep0_bounce buffer.

Signed-off-by: Felipe Balbi <balbi@ti.com>

2 files changed, 8 insertions, 6 deletions

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index ef28bd5680c5..fbd0c8e30c19 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -51,6 +51,7 @@
 #include <linux/usb/gadget.h>
 
 /* Global constants */
+#define DWC3_EP0_BOUNCE_SIZE    512
 #define DWC3_ENDPOINTS_NUM      32
 #define DWC3_XHCI_RESOURCES_NUM 2
 
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 31ffc5c27354..12844393bc3e 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2319,7 +2319,7 @@ int __devinit dwc3_gadget_init(struct dwc3 *dwc)
                 goto err1;
         }
 
-        dwc->setup_buf = kzalloc(512, GFP_KERNEL);
+        dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
         if (!dwc->setup_buf) {
                 dev_err(dwc->dev, "failed to allocate setup buffer\n");
                 ret = -ENOMEM;
@@ -2327,7 +2327,8 @@ int __devinit dwc3_gadget_init(struct dwc3 *dwc)
         }
 
         dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
-                        512, &dwc->ep0_bounce_addr, GFP_KERNEL);
+                        DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
+                        GFP_KERNEL);
         if (!dwc->ep0_bounce) {
                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
                 ret = -ENOMEM;
@@ -2414,8 +2415,8 @@ err5:
         dwc3_gadget_free_endpoints(dwc);
 
 err4:
-        dma_free_coherent(dwc->dev, 512, dwc->ep0_bounce,
-                        dwc->ep0_bounce_addr);
+        dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
+                        dwc->ep0_bounce, dwc->ep0_bounce_addr);
 
 err3:
         kfree(dwc->setup_buf);
@@ -2444,8 +2445,8 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
 
         dwc3_gadget_free_endpoints(dwc);
 
-        dma_free_coherent(dwc->dev, 512, dwc->ep0_bounce,
-                        dwc->ep0_bounce_addr);
+        dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
+                        dwc->ep0_bounce, dwc->ep0_bounce_addr);
 
         kfree(dwc->setup_buf);