linux-kernel - [PATCH] usb: misc: add missing continue and refactor code

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Message-ID: <20170403143953.GA7450@embeddedgus>
Date:   Mon, 3 Apr 2017 09:39:53 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Peter Chen <peter.chen@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH] usb: misc: add missing continue and refactor code

-Code refactoring to make the flow easier to follow.
-Add missing 'continue' for case USB_ENDPOINT_XFER_INT.

Addresses-Coverity-ID: 1248733
Cc: Alan Stern <stern@...loand.harvard.edu>
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/usb/misc/usbtest.c | 68 +++++++++++++++++++++-------------------------
 1 file changed, 31 insertions(+), 37 deletions(-)

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 3525626..382491e 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -124,18 +124,32 @@ static struct usb_device *testdev_to_usbdev(struct usbtest_dev *test)
 
 /*-------------------------------------------------------------------------*/
 
+static inline void endpoint_update(int edi,
+				   struct usb_host_endpoint **in,
+				   struct usb_host_endpoint **out,
+				   struct usb_host_endpoint *e)
+{
+	if (edi) {
+		if (!*in)
+			*in = e;
+	} else {
+		if (!*out)
+			*out = e;
+	}
+}
+
 static int
 get_endpoints(struct usbtest_dev *dev, struct usb_interface *intf)
 {
-	int				tmp;
-	struct usb_host_interface	*alt;
-	struct usb_host_endpoint	*in, *out;
-	struct usb_host_endpoint	*iso_in, *iso_out;
-	struct usb_host_endpoint	*int_in, *int_out;
-	struct usb_device		*udev;
+	int                             tmp;
+	struct usb_host_interface       *alt;
+	struct usb_host_endpoint        *in, *out;
+	struct usb_host_endpoint        *iso_in, *iso_out;
+	struct usb_host_endpoint        *int_in, *int_out;
+	struct usb_device               *udev;
 
 	for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
-		unsigned	ep;
+		unsigned        ep;
 
 		in = out = NULL;
 		iso_in = iso_out = NULL;
@@ -150,47 +164,27 @@ get_endpoints(struct usbtest_dev *dev, struct usb_interface *intf)
 		 * ignore other endpoints and altsettings.
 		 */
 		for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
-			struct usb_host_endpoint	*e;
+			struct usb_host_endpoint        *e;
+			int edi;
 
 			e = alt->endpoint + ep;
+			edi = usb_endpoint_dir_in(&e->desc);
+
 			switch (usb_endpoint_type(&e->desc)) {
 			case USB_ENDPOINT_XFER_BULK:
-				break;
+				endpoint_update(edi, &in, &out, e);
+				continue;
 			case USB_ENDPOINT_XFER_INT:
 				if (dev->info->intr)
-					goto try_intr;
+					endpoint_update(edi, &int_in, &int_out, e);
+				continue;
 			case USB_ENDPOINT_XFER_ISOC:
 				if (dev->info->iso)
-					goto try_iso;
-				/* FALLTHROUGH */
+					endpoint_update(edi, &iso_in, &iso_out, e);
+				/* fall through */
 			default:
 				continue;
 			}
-			if (usb_endpoint_dir_in(&e->desc)) {
-				if (!in)
-					in = e;
-			} else {
-				if (!out)
-					out = e;
-			}
-			continue;
-try_intr:
-			if (usb_endpoint_dir_in(&e->desc)) {
-				if (!int_in)
-					int_in = e;
-			} else {
-				if (!int_out)
-					int_out = e;
-			}
-			continue;
-try_iso:
-			if (usb_endpoint_dir_in(&e->desc)) {
-				if (!iso_in)
-					iso_in = e;
-			} else {
-				if (!iso_out)
-					iso_out = e;
-			}
 		}
 		if ((in && out)  ||  iso_in || iso_out || int_in || int_out)
 			goto found;
-- 
2.5.0