Re: [PATCH v2 1/7] media: uvcvideo: Use pr_cont() macro

[Joe Perches <joe@perches.com>]

On Wed, 2020-11-04 at 19:07 +0100, Ricardo Ribalda wrote:
> Replace all the uses of printk(KERN_CONT ... with pr_cont().

Perhaps remove the uvc_printk macro and uses and use the more
common pr_fmt and pr_<level> mechanisms.

Something like:
---
 drivers/media/usb/uvc/uvc_ctrl.c   |  5 +++--
 drivers/media/usb/uvc/uvc_driver.c | 35 +++++++++++++++------------------
 drivers/media/usb/uvc/uvc_entity.c | 10 ++++++----
 drivers/media/usb/uvc/uvc_status.c |  9 +++++----
 drivers/media/usb/uvc/uvc_video.c  | 40 ++++++++++++++++----------------------
 drivers/media/usb/uvc/uvcvideo.h   | 25 +++++++++++-------------
 6 files changed, 58 insertions(+), 66 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index f479d8971dfb..e0b273697d49 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -6,6 +6,8 @@
  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/module.h>
@@ -1317,8 +1319,7 @@ static void uvc_ctrl_status_event_work(struct work_struct *work)
 	w->urb->interval = dev->int_ep->desc.bInterval;
 	ret = usb_submit_urb(w->urb, GFP_KERNEL);
 	if (ret < 0)
-		uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
-			   ret);
+		pr_err("Failed to resubmit status URB (%d)\n", ret);
 }
 
 bool uvc_ctrl_status_event(struct urb *urb, struct uvc_video_chain *chain,
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index ddb9eaa11be7..03d68e2b6b70 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -6,6 +6,8 @@
  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/atomic.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
@@ -534,8 +536,7 @@ static int uvc_parse_format(struct uvc_device *dev,
 				sizeof(format->name));
 			format->fcc = fmtdesc->fcc;
 		} else {
-			uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
-				&buffer[5]);
+			pr_info("Unknown video format %pUl\n", &buffer[5]);
 			snprintf(format->name, sizeof(format->name), "%pUl\n",
 				&buffer[5]);
 			format->fcc = 0;
@@ -1925,7 +1926,7 @@ static int uvc_scan_device(struct uvc_device *dev)
 		uvc_scan_fallback(dev);
 
 	if (list_empty(&dev->chains)) {
-		uvc_printk(KERN_INFO, "No valid video chain found.\n");
+		pr_info("No valid video chain found\n");
 		return -1;
 	}
 
@@ -2077,8 +2078,8 @@ int uvc_register_video_device(struct uvc_device *dev,
 
 	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
 	if (ret < 0) {
-		uvc_printk(KERN_ERR, "Failed to register %s device (%d).\n",
-			   v4l2_type_names[type], ret);
+		pr_err("Failed to register %s device (%d)\n",
+		       v4l2_type_names[type], ret);
 		return ret;
 	}
 
@@ -2094,8 +2095,7 @@ static int uvc_register_video(struct uvc_device *dev,
 	/* Initialize the streaming interface with default parameters. */
 	ret = uvc_video_init(stream);
 	if (ret < 0) {
-		uvc_printk(KERN_ERR, "Failed to initialize the device (%d).\n",
-			   ret);
+		pr_err("Failed to initialize the device (%d)\n", ret);
 		return ret;
 	}
 
@@ -2129,8 +2129,8 @@ static int uvc_register_terms(struct uvc_device *dev,
 
 		stream = uvc_stream_by_id(dev, term->id);
 		if (stream == NULL) {
-			uvc_printk(KERN_INFO, "No streaming interface found "
-				   "for terminal %u.", term->id);
+			pr_info("No streaming interface found for terminal %u\n",
+				term->id);
 			continue;
 		}
 
@@ -2163,8 +2163,7 @@ static int uvc_register_chains(struct uvc_device *dev)
 #ifdef CONFIG_MEDIA_CONTROLLER
 		ret = uvc_mc_register_entities(chain);
 		if (ret < 0)
-			uvc_printk(KERN_INFO,
-				   "Failed to register entities (%d).\n", ret);
+			pr_info("Failed to register entities (%d)\n", ret);
 #endif
 	}
 
@@ -2261,17 +2260,16 @@ static int uvc_probe(struct usb_interface *intf,
 		goto error;
 	}
 
-	uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
+	pr_info("Found UVC %u.%02x device %s (%04x:%04x)\n",
 		dev->uvc_version >> 8, dev->uvc_version & 0xff,
 		udev->product ? udev->product : "<unnamed>",
 		le16_to_cpu(udev->descriptor.idVendor),
 		le16_to_cpu(udev->descriptor.idProduct));
 
 	if (dev->quirks != dev->info->quirks) {
-		uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
-			"parameter for testing purpose.\n", dev->quirks);
-		uvc_printk(KERN_INFO, "Please report required quirks to the "
-			"linux-uvc-devel mailing list.\n");
+		pr_info("Forcing device quirks to 0x%x by module parameter for testing purpose\n",
+			dev->quirks);
+		pr_info("Please report required quirks to the linux-uvc-devel mailing list\n");
 	}
 
 	/* Register the V4L2 device. */
@@ -2300,9 +2298,8 @@ static int uvc_probe(struct usb_interface *intf,
 
 	/* Initialize the interrupt URB. */
 	if ((ret = uvc_status_init(dev)) < 0) {
-		uvc_printk(KERN_INFO, "Unable to initialize the status "
-			"endpoint (%d), status interrupt will not be "
-			"supported.\n", ret);
+		pr_info("Unable to initialize the status endpoint (%d), status interrupt will not be supported\n",
+			ret);
 	}
 
 	uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
diff --git a/drivers/media/usb/uvc/uvc_entity.c b/drivers/media/usb/uvc/uvc_entity.c
index ca3a9c2eec27..a5c11cde273c 100644
--- a/drivers/media/usb/uvc/uvc_entity.c
+++ b/drivers/media/usb/uvc/uvc_entity.c
@@ -6,6 +6,8 @@
  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/videodev2.h>
@@ -139,8 +141,8 @@ int uvc_mc_register_entities(struct uvc_video_chain *chain)
 	list_for_each_entry(entity, &chain->entities, chain) {
 		ret = uvc_mc_init_entity(chain, entity);
 		if (ret < 0) {
-			uvc_printk(KERN_INFO, "Failed to initialize entity for "
-				   "entity %u\n", entity->id);
+			pr_info("Failed to initialize entity for entity %u\n",
+				entity->id);
 			return ret;
 		}
 	}
@@ -148,8 +150,8 @@ int uvc_mc_register_entities(struct uvc_video_chain *chain)
 	list_for_each_entry(entity, &chain->entities, chain) {
 		ret = uvc_mc_create_links(chain, entity);
 		if (ret < 0) {
-			uvc_printk(KERN_INFO, "Failed to create links for "
-				   "entity %u\n", entity->id);
+			pr_info("Failed to create links for entity %u\n",
+				entity->id);
 			return ret;
 		}
 	}
diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c
index 2bdb0ff203f8..4c84525ada71 100644
--- a/drivers/media/usb/uvc/uvc_status.c
+++ b/drivers/media/usb/uvc/uvc_status.c
@@ -6,6 +6,8 @@
  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/input.h>
 #include <linux/slab.h>
@@ -208,8 +210,8 @@ static void uvc_status_complete(struct urb *urb)
 		return;
 
 	default:
-		uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
-			"completion handler.\n", urb->status);
+		pr_warn("Non-zero status (%d) in status completion handler\n",
+			urb->status);
 		return;
 	}
 
@@ -244,8 +246,7 @@ static void uvc_status_complete(struct urb *urb)
 	/* Resubmit the URB. */
 	urb->interval = dev->int_ep->desc.bInterval;
 	if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
-		uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
-			ret);
+		pr_err("Failed to resubmit status URB (%d)\n", ret);
 	}
 }
 
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index a6a441d92b94..6d48bcdeac16 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -6,6 +6,8 @@
  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/module.h>
@@ -76,9 +78,8 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
 	if (likely(ret == size))
 		return 0;
 
-	uvc_printk(KERN_ERR,
-		   "Failed to query (%s) UVC control %u on unit %u: %d (exp. %u).\n",
-		   uvc_query_name(query), cs, unit, ret, size);
+	pr_err("Failed to query (%s) UVC control %u on unit %u: %d (exp. %u)\n",
+	       uvc_query_name(query), cs, unit, ret, size);
 
 	if (ret != -EPIPE)
 		return ret;
@@ -254,9 +255,8 @@ static int uvc_get_video_ctrl(struct uvc_streaming *stream,
 		ret = -EIO;
 		goto out;
 	} else if (ret != size) {
-		uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : "
-			"%d (exp. %u).\n", query, probe ? "probe" : "commit",
-			ret, size);
+		pr_err("Failed to query (%u) UVC %s control : %d (exp. %u)\n",
+		       query, probe ? "probe" : "commit", ret, size);
 		ret = -EIO;
 		goto out;
 	}
@@ -334,9 +334,8 @@ static int uvc_set_video_ctrl(struct uvc_streaming *stream,
 		probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data,
 		size, uvc_timeout_param);
 	if (ret != size) {
-		uvc_printk(KERN_ERR, "Failed to set UVC %s control : "
-			"%d (exp. %u).\n", probe ? "probe" : "commit",
-			ret, size);
+		pr_err("Failed to set UVC %s control : %d (exp. %u)\n",
+		       probe ? "probe" : "commit", ret, size);
 		ret = -EIO;
 	}
 
@@ -1120,8 +1119,7 @@ static void uvc_video_copy_data_work(struct work_struct *work)
 
 	ret = usb_submit_urb(uvc_urb->urb, GFP_KERNEL);
 	if (ret < 0)
-		uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n",
-			   ret);
+		pr_err("Failed to resubmit video URB (%d)\n", ret);
 }
 
 static void uvc_video_decode_data(struct uvc_urb *uvc_urb,
@@ -1507,8 +1505,8 @@ static void uvc_video_complete(struct urb *urb)
 		break;
 
 	default:
-		uvc_printk(KERN_WARNING, "Non-zero status (%d) in video "
-			"completion handler.\n", urb->status);
+		pr_warn("Non-zero status (%d) in video completion handler\n",
+			urb->status);
 		fallthrough;
 	case -ENOENT:		/* usb_poison_urb() called. */
 		if (stream->frozen)
@@ -1545,9 +1543,7 @@ static void uvc_video_complete(struct urb *urb)
 	if (!uvc_urb->async_operations) {
 		ret = usb_submit_urb(uvc_urb->urb, GFP_ATOMIC);
 		if (ret < 0)
-			uvc_printk(KERN_ERR,
-				   "Failed to resubmit video URB (%d).\n",
-				   ret);
+			pr_err("Failed to resubmit video URB (%d)\n", ret);
 		return;
 	}
 
@@ -1893,8 +1889,8 @@ static int uvc_video_start_transfer(struct uvc_streaming *stream,
 	for_each_uvc_urb(uvc_urb, stream) {
 		ret = usb_submit_urb(uvc_urb->urb, gfp_flags);
 		if (ret < 0) {
-			uvc_printk(KERN_ERR, "Failed to submit URB %u (%d).\n",
-				   uvc_urb_index(uvc_urb), ret);
+			pr_err("Failed to submit URB %u (%d)\n",
+			       uvc_urb_index(uvc_urb), ret);
 			uvc_video_stop_transfer(stream, 1);
 			return ret;
 		}
@@ -1989,7 +1985,7 @@ int uvc_video_init(struct uvc_streaming *stream)
 	int ret;
 
 	if (stream->nformats == 0) {
-		uvc_printk(KERN_INFO, "No supported video formats found.\n");
+		pr_info("No supported video formats found\n");
 		return -EINVAL;
 	}
 
@@ -2029,8 +2025,7 @@ int uvc_video_init(struct uvc_streaming *stream)
 	}
 
 	if (format->nframes == 0) {
-		uvc_printk(KERN_INFO, "No frame descriptor found for the "
-			"default format.\n");
+		pr_info("No frame descriptor found for the default format\n");
 		return -EINVAL;
 	}
 
@@ -2064,8 +2059,7 @@ int uvc_video_init(struct uvc_streaming *stream)
 		if (stream->intf->num_altsetting == 1)
 			stream->decode = uvc_video_encode_bulk;
 		else {
-			uvc_printk(KERN_INFO, "Isochronous endpoints are not "
-				"supported for video output devices.\n");
+			pr_info("Isochronous endpoints are not supported for video output devices\n");
 			return -EINVAL;
 		}
 	}
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index a3dfacf069c4..724dec20444a 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -725,20 +725,17 @@ extern unsigned int uvc_trace_param;
 extern unsigned int uvc_timeout_param;
 extern unsigned int uvc_hw_timestamps_param;
 
-#define uvc_trace(flag, msg...) \
-	do { \
-		if (uvc_trace_param & flag) \
-			printk(KERN_DEBUG "uvcvideo: " msg); \
-	} while (0)
-
-#define uvc_warn_once(dev, warn, msg...) \
-	do { \
-		if (!test_and_set_bit(warn, &dev->warnings)) \
-			printk(KERN_INFO "uvcvideo: " msg); \
-	} while (0)
-
-#define uvc_printk(level, msg...) \
-	printk(level "uvcvideo: " msg)
+#define uvc_trace(flag, fmt, ...)					\
+do {									\
+	if (uvc_trace_param & flag)					\
+		printk(KERN_DEBUG "uvcvideo: " fmt, ##__VA_ARGS__);	\
+} while (0)
+
+#define uvc_warn_once(dev, warn, fmt, ...)				\
+do {									\
+	if (!test_and_set_bit(warn, &(dev)->warnings))			\
+		pr_info(fmt, ##__VA_ARGS__);				\
+} while (0)
 
 /* --------------------------------------------------------------------------
  * Internal functions.