media: uvcvideo: New macro uvc_trace_cont

Remove all the duplicated code around printk(KERN_CONT, with a new macro.
Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/uvc/uvc_driver.c

@@ -1606,8 +1606,7 @@ static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
 {
 	switch (UVC_ENTITY_TYPE(entity)) {
 	case UVC_VC_EXTENSION_UNIT:
-		if (uvc_trace_param & UVC_TRACE_PROBE)
-			printk(KERN_CONT " <- XU %d", entity->id);
+		uvc_trace_cont(UVC_TRACE_PROBE, " <- XU %d", entity->id);
 
 		if (entity->bNrInPins != 1) {
 			uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
@@ -1618,8 +1617,7 @@ static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
 		break;
 
 	case UVC_VC_PROCESSING_UNIT:
-		if (uvc_trace_param & UVC_TRACE_PROBE)
-			printk(KERN_CONT " <- PU %d", entity->id);
+		uvc_trace_cont(UVC_TRACE_PROBE, " <- PU %d", entity->id);
 
 		if (chain->processing != NULL) {
 			uvc_trace(UVC_TRACE_DESCR, "Found multiple "
@@ -1631,8 +1629,7 @@ static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
 		break;
 
 	case UVC_VC_SELECTOR_UNIT:
-		if (uvc_trace_param & UVC_TRACE_PROBE)
-			printk(KERN_CONT " <- SU %d", entity->id);
+		uvc_trace_cont(UVC_TRACE_PROBE, " <- SU %d", entity->id);
 
 		/* Single-input selector units are ignored. */
 		if (entity->bNrInPins == 1)
@@ -1650,27 +1647,22 @@ static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
 	case UVC_ITT_VENDOR_SPECIFIC:
 	case UVC_ITT_CAMERA:
 	case UVC_ITT_MEDIA_TRANSPORT_INPUT:
-		if (uvc_trace_param & UVC_TRACE_PROBE)
-			printk(KERN_CONT " <- IT %d\n", entity->id);
+		uvc_trace_cont(UVC_TRACE_PROBE, " <- IT %d\n", entity->id);
 
 		break;
 
 	case UVC_OTT_VENDOR_SPECIFIC:
 	case UVC_OTT_DISPLAY:
 	case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
-		if (uvc_trace_param & UVC_TRACE_PROBE)
-			printk(KERN_CONT " OT %d", entity->id);
+		uvc_trace_cont(UVC_TRACE_PROBE, " OT %d", entity->id);
 
 		break;
 
 	case UVC_TT_STREAMING:
-		if (UVC_ENTITY_IS_ITERM(entity)) {
-			if (uvc_trace_param & UVC_TRACE_PROBE)
-				printk(KERN_CONT " <- IT %d\n", entity->id);
-		} else {
-			if (uvc_trace_param & UVC_TRACE_PROBE)
-				printk(KERN_CONT " OT %d", entity->id);
-		}
+		if (UVC_ENTITY_IS_ITERM(entity))
+			uvc_trace_cont(UVC_TRACE_PROBE, " <- IT %d\n", entity->id);
+		else
+			uvc_trace_cont(UVC_TRACE_PROBE, " OT %d", entity->id);
 
 		break;
 
@@ -1717,13 +1709,11 @@ static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
 			}
 
 			list_add_tail(&forward->chain, &chain->entities);
-			if (uvc_trace_param & UVC_TRACE_PROBE) {
-				if (!found)
-					printk(KERN_CONT " (->");
+			if (!found)
+				uvc_trace_cont(UVC_TRACE_PROBE, " (->");
 
-				printk(KERN_CONT " XU %d", forward->id);
-				found = 1;
-			}
+			uvc_trace_cont(UVC_TRACE_PROBE, " XU %d", forward->id);
+			found = 1;
 			break;
 
 		case UVC_OTT_VENDOR_SPECIFIC:
@@ -1737,18 +1727,16 @@ static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
 			}
 
 			list_add_tail(&forward->chain, &chain->entities);
-			if (uvc_trace_param & UVC_TRACE_PROBE) {
-				if (!found)
-					printk(KERN_CONT " (->");
+			if (!found)
+				uvc_trace_cont(UVC_TRACE_PROBE, " (->");
 
-				printk(KERN_CONT " OT %d", forward->id);
-				found = 1;
-			}
+			uvc_trace_cont(UVC_TRACE_PROBE, " OT %d", forward->id);
+			found = 1;
 			break;
 		}
 	}
 	if (found)
-		printk(KERN_CONT ")");
+		uvc_trace_cont(UVC_TRACE_PROBE, ")");
 
 	return 0;
 }
@@ -1773,8 +1761,7 @@ static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
 			break;
 		}
 
-		if (uvc_trace_param & UVC_TRACE_PROBE)
-			printk(KERN_CONT " <- IT");
+		uvc_trace_cont(UVC_TRACE_PROBE, " <- IT");
 
 		chain->selector = entity;
 		for (i = 0; i < entity->bNrInPins; ++i) {
@@ -1794,15 +1781,13 @@ static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
 				return -EINVAL;
 			}
 
-			if (uvc_trace_param & UVC_TRACE_PROBE)
-				printk(KERN_CONT " %d", term->id);
+			uvc_trace_cont(UVC_TRACE_PROBE, " %d", term->id);
 
 			list_add_tail(&term->chain, &chain->entities);
 			uvc_scan_chain_forward(chain, term, entity);
 		}
 
-		if (uvc_trace_param & UVC_TRACE_PROBE)
-			printk(KERN_CONT "\n");
+		uvc_trace_cont(UVC_TRACE_PROBE, "\n");
 
 		id = 0;
 		break;

drivers/media/usb/uvc/uvcvideo.h

@@ -758,6 +758,12 @@ do {									\
 		printk(KERN_DEBUG "uvcvideo: " fmt, ##__VA_ARGS__);	\
 } while (0)
 
+#define uvc_trace_cont(flag, fmt, ...)					\
+do {									\
+	if (uvc_trace_param & flag)					\
+		pr_cont(fmt, ##__VA_ARGS__);				\
+} while (0)
+
 #define uvc_warn_once(_dev, warn, fmt, ...)				\
 do {									\
 	if (!test_and_set_bit(warn, &(_dev)->warnings))			\