usb: gadget: move USB_BUFSIZ into global composite.h

This patch moves USB_BUFSIZ into global header file as
USB_COMP_EP0_BUFSIZ. There is currently only one user (f_sourcesink)
besides composite which need it. Ideally f_sourcesink would have its
own ep0 buffer. Lets keep it that way it was for now.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

3 files changed, 8 insertions, 7 deletions

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 0b6ee2012af1..52689ee9db12 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -28,9 +28,6 @@
  * with the relevant device-wide data.
  */
 
-/* big enough to hold our biggest descriptor */
-#define USB_BUFSIZ      1024
-
 /* Some systems will need runtime overrides for the  product identifiers
  * published in the device descriptor, either numbers or strings or both.
  * String parameters are in UTF-8 (superset of ASCII's 7 bit characters).
@@ -355,10 +352,11 @@ static int config_buf(struct usb_configuration *config,
 {
         struct usb_config_descriptor    *c = buf;
         void                            *next = buf + USB_DT_CONFIG_SIZE;
-        int                             len = USB_BUFSIZ - USB_DT_CONFIG_SIZE;
+        int                             len;
         struct usb_function             *f;
         int                             status;
 
+        len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
         /* write the config descriptor */
         c = buf;
         c->bLength = USB_DT_CONFIG_SIZE;
@@ -1445,13 +1443,13 @@ static int composite_bind(struct usb_gadget *gadget,
         cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
         if (!cdev->req)
                 goto fail;
-        cdev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL);
+        cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
         if (!cdev->req->buf)
                 goto fail;
         cdev->req->complete = composite_setup_complete;
         gadget->ep0->driver_data = cdev;
 
-        cdev->bufsiz = USB_BUFSIZ;
+        cdev->bufsiz = USB_COMP_EP0_BUFSIZ;
         cdev->driver = composite;
 
         /*
diff --git a/drivers/usb/gadget/f_sourcesink.c b/drivers/usb/gadget/f_sourcesink.c
index 5c1b68b63c98..3c126fde6e7e 100644
--- a/drivers/usb/gadget/f_sourcesink.c
+++ b/drivers/usb/gadget/f_sourcesink.c
@@ -795,7 +795,7 @@ static int sourcesink_setup(struct usb_configuration *c,
         u16                     w_value = le16_to_cpu(ctrl->wValue);
         u16                     w_length = le16_to_cpu(ctrl->wLength);
 
-        req->length = USB_BUFSIZ;
+        req->length = USB_COMP_EP0_BUFSIZ;
 
         /* composite driver infrastructure handles everything except
          * the two control test requests.
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 43d6b9ca51b7..89d91b671eb0 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -46,6 +46,9 @@
  */
 #define USB_GADGET_DELAYED_STATUS       0x7fff  /* Impossibly large value */
 
+/* big enough to hold our biggest descriptor */
+#define USB_COMP_EP0_BUFSIZ     1024
+
 struct usb_configuration;
 
 /**