usb: introduce usb_ep_type_string() function

In some places, the code prints a human-readable USB endpoint
transfer type (e.g. "bulk"). This involves a switch statement
sometimes wrapped around in ({ ... }) block leading to code
repetition.
To make this scenario easier, here introduces usb_ep_type_string()
function, which returns a human-readable name of provided
endpoint type.
It also changes a few places switch was used to use this
new function.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5 files changed, 28 insertions, 35 deletions

diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 48277bbc15e4..2174dd9ec176 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -16,6 +16,22 @@
 #include <linux/usb/otg.h>
 #include <linux/of_platform.h>
 
+static const char *const ep_type_names[] = {
+        [USB_ENDPOINT_XFER_CONTROL] = "ctrl",
+        [USB_ENDPOINT_XFER_ISOC] = "isoc",
+        [USB_ENDPOINT_XFER_BULK] = "bulk",
+        [USB_ENDPOINT_XFER_INT] = "intr",
+};
+
+const char *usb_ep_type_string(int ep_type)
+{
+        if (ep_type < 0 || ep_type >= ARRAY_SIZE(ep_type_names))
+                return "unknown";
+
+        return ep_type_names[ep_type];
+}
+EXPORT_SYMBOL_GPL(usb_ep_type_string);
+
 const char *usb_otg_state_string(enum usb_otg_state state)
 {
         static const char *const names[] = {
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index b227a2651e7c..35f7e5fdf4da 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1878,23 +1878,10 @@ rescan:
                 /* kick hcd */
                 unlink1(hcd, urb, -ESHUTDOWN);
                 dev_dbg (hcd->self.controller,
-                        "shutdown urb %pK ep%d%s%s\n",
+                        "shutdown urb %pK ep%d%s-%s\n",
                         urb, usb_endpoint_num(&ep->desc),
                         is_in ? "in" : "out",
-                        ({      char *s;
-
-                                 switch (usb_endpoint_type(&ep->desc)) {
-                                 case USB_ENDPOINT_XFER_CONTROL:
-                                        s = ""; break;
-                                 case USB_ENDPOINT_XFER_BULK:
-                                        s = "-bulk"; break;
-                                 case USB_ENDPOINT_XFER_INT:
-                                        s = "-intr"; break;
-                                 default:
-                                        s = "-iso"; break;
-                                };
-                                s;
-                        }));
+                        usb_ep_type_string(usb_endpoint_type(&ep->desc)));
                 usb_put_urb (urb);
 
                 /* list contents may have changed */
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
index 83340f4fdc6e..35941dc125f9 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/epn.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
@@ -593,10 +593,6 @@ static int ast_vhub_epn_disable(struct usb_ep* u_ep)
 static int ast_vhub_epn_enable(struct usb_ep* u_ep,
                                const struct usb_endpoint_descriptor *desc)
 {
-        static const char *ep_type_string[] __maybe_unused = { "ctrl",
-                                                               "isoc",
-                                                               "bulk",
-                                                               "intr" };
         struct ast_vhub_ep *ep = to_ast_ep(u_ep);
         struct ast_vhub_dev *dev;
         struct ast_vhub *vhub;
@@ -646,7 +642,7 @@ static int ast_vhub_epn_enable(struct usb_ep* u_ep,
         ep->epn.wedged = false;
 
         EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n",
-              ep->epn.is_in ? "in" : "out", ep_type_string[type],
+              ep->epn.is_in ? "in" : "out", usb_ep_type_string(type),
               usb_endpoint_num(desc), maxpacket);
 
         /* Can we use DMA descriptor mode ? */
diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index baf72f95f0f1..40c6a484e232 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -617,21 +617,7 @@ static int dummy_enable(struct usb_ep *_ep,
                 _ep->name,
                 desc->bEndpointAddress & 0x0f,
                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
-                ({ char *val;
-                 switch (usb_endpoint_type(desc)) {
-                 case USB_ENDPOINT_XFER_BULK:
-                         val = "bulk";
-                         break;
-                 case USB_ENDPOINT_XFER_ISOC:
-                         val = "iso";
-                         break;
-                 case USB_ENDPOINT_XFER_INT:
-                         val = "intr";
-                         break;
-                 default:
-                         val = "ctrl";
-                         break;
-                 } val; }),
+                usb_ep_type_string(usb_endpoint_type(desc)),
                 max, ep->stream_en ? "enabled" : "disabled");
 
         /* at this point real hardware should be NAKing transfers
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 523aa088f6ab..da82606be605 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -37,6 +37,14 @@
 #include <uapi/linux/usb/ch9.h>
 
 /**
+ * usb_ep_type_string() - Returns human readable-name of the endpoint type.
+ * @ep_type: The endpoint type to return human-readable name for.  If it's not
+ *   any of the types: USB_ENDPOINT_XFER_{CONTROL, ISOC, BULK, INT},
+ *   usually got by usb_endpoint_type(), the string 'unknown' will be returned.
+ */
+extern const char *usb_ep_type_string(int ep_type);
+
+/**
  * usb_speed_string() - Returns human readable-name of the speed.
  * @speed: The speed to return human-readable name for.  If it's not
  *   any of the speeds defined in usb_device_speed enum, string for