[PATCH 1/2] stdio: Introduce stdio_valid()

[Nicolas Saenz Julienne <nsaenzjulienne@suse.de>]

stdio_valid() will confirm that a struct stdio_dev pointer is indeed
valid.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 common/stdio.c      | 11 +++++++++++
 include/stdio_dev.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/common/stdio.c b/common/stdio.c
index abf9b1e915..69b7d2692d 100644
--- a/common/stdio.c
+++ b/common/stdio.c
@@ -157,6 +157,17 @@ static int stdio_probe_device(const char *name, enum uclass_id id,
 	return 0;
 }
 
+bool stdio_valid(struct stdio_dev *dev)
+{
+	struct stdio_dev *sdev;
+
+	list_for_each_entry(sdev, &devs.list, list)
+		if (sdev == dev)
+			return true;
+
+	return false;
+}
+
 struct stdio_dev *stdio_get_by_name(const char *name)
 {
 	struct list_head *pos;
diff --git a/include/stdio_dev.h b/include/stdio_dev.h
index 48871a6a22..f341439b03 100644
--- a/include/stdio_dev.h
+++ b/include/stdio_dev.h
@@ -97,6 +97,7 @@ int stdio_deregister_dev(struct stdio_dev *dev, int force);
 struct list_head *stdio_get_list(void);
 struct stdio_dev *stdio_get_by_name(const char *name);
 struct stdio_dev *stdio_clone(struct stdio_dev *dev);
+bool stdio_valid(struct stdio_dev *dev);
 
 int drv_lcd_init(void);
 int drv_video_init(void);
-- 
2.30.0