[PATCH v1 2/2] devinfo: print only devices with errors

@@ -5,6 +5,7 @@
 #include <common.h>
 #include <complete.h>
 #include <driver.h>
+#include <getopt.h>
 
 static int do_devinfo_subtree(struct device_d *dev, int depth)
 {

@@ -16,6 +17,9 @@ static int do_devinfo_subtree(struct device_d *dev, int depth)
 		printf("   ");
 
 	printf("`-- %s", dev_name(dev));
+	if (dev_have_err(dev))
+		printf(" <-- (error!)");
+
 	if (!list_empty(&dev->cdevs)) {
 		printf("\n");
 		list_for_each_entry(cdev, &dev->cdevs, devices_list) {

@@ -43,6 +47,15 @@ static int do_devinfo_subtree(struct device_d *dev, int depth)
 	return 0;
 }
 
+static int do_devinfo_err(void)
+{
+	struct device_d *dev;
+
+	for_each_device(dev)
+		if (dev_have_err(dev))
+			do_devinfo_subtree(dev, 0);
+	return 0;
+}
 
 static int do_devinfo(int argc, char *argv[])
 {

@@ -58,6 +71,23 @@ static int do_devinfo(int argc, char *argv[])
 				do_devinfo_subtree(dev, 0);
 		}
 	} else {
+		bool dev_err = false;
+		int opt;
+
+		while ((opt = getopt(argc, argv, "e")) > 0) {
+			switch (opt) {
+			case 'e':
+				dev_err = true;
+				break;
+			default:
+				return COMMAND_ERROR_USAGE;
+			}
+		}
+
+		if (dev_err) {
+			return do_devinfo_err();
+		}
+
 		dev = get_device_by_name(argv[1]);
 		if (!dev)
 			return -ENODEV;