of: propagate errors inside barebox_register_{of, fdt} into initcalls

Errors during device tree registration, while uncommon, are really
annoying, because the system may limp along and it's not clear where
the misbehavior originates from.

Failing the initcall of the device tree would improve user experience in
that error case. There is intentionally no early exit on error cases
to give barebox a chance to probe the serial driver to actually report
errors when DEBUG_LL is disabled.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20210531071239.30653-4-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

9 files changed, 20 insertions, 28 deletions

diff --git a/arch/arm/boards/qemu-virt/board.c b/arch/arm/boards/qemu-virt/board.c
index d0a7e3da4f..5ce1ecfc24 100644
--- a/arch/arm/boards/qemu-virt/board.c
+++ b/arch/arm/boards/qemu-virt/board.c
@@ -40,9 +40,8 @@ static int replace_dtb(void) {
 
 	overlay = of_unflatten_dtb(__dtb_overlay_of_flash_start);
 	of_overlay_apply_tree(root, overlay);
-	barebox_register_of(root);
 
-	return 0;
+	return barebox_register_of(root);
 }
 
 pure_initcall(replace_dtb);
diff --git a/arch/arm/cpu/dtb.c b/arch/arm/cpu/dtb.c
index 35f251d99a..9aa979ca08 100644
--- a/arch/arm/cpu/dtb.c
+++ b/arch/arm/cpu/dtb.c
@@ -26,8 +26,6 @@ static int of_arm_init(void)
 		return 0;
 	}
 
-	barebox_register_fdt(fdt);
-
-	return 0;
+	return barebox_register_fdt(fdt);
 }
 core_initcall(of_arm_init);
diff --git a/arch/kvx/lib/dtb.c b/arch/kvx/lib/dtb.c
index 09898017c9..3d65bd7bd4 100644
--- a/arch/kvx/lib/dtb.c
+++ b/arch/kvx/lib/dtb.c
@@ -9,8 +9,6 @@
 
 static int of_kvx_init(void)
 {
-	barebox_register_fdt(boot_dtb);
-
-	return 0;
+	return barebox_register_fdt(boot_dtb);
 }
 core_initcall(of_kvx_init);
diff --git a/arch/mips/boot/dtb.c b/arch/mips/boot/dtb.c
index 6fce4700cc..dbb6315d1f 100644
--- a/arch/mips/boot/dtb.c
+++ b/arch/mips/boot/dtb.c
@@ -41,8 +41,6 @@ static int of_mips_init(void)
 	if (!fdt)
 		fdt = __dtb_start;
 
-	barebox_register_fdt(fdt);
-
-	return 0;
+	return barebox_register_fdt(fdt);
 }
 core_initcall(of_mips_init);
diff --git a/arch/openrisc/lib/dtb.c b/arch/openrisc/lib/dtb.c
index 61cf35ddf3..0507eed1d7 100644
--- a/arch/openrisc/lib/dtb.c
+++ b/arch/openrisc/lib/dtb.c
@@ -28,8 +28,6 @@ static int of_openrisc_init(void)
 	if (root)
 		return 0;
 
-	barebox_register_fdt(__dtb_start);
-
-	return 0;
+	return barebox_register_fdt(__dtb_start);
 }
 core_initcall(of_openrisc_init);
diff --git a/arch/riscv/lib/dtb.c b/arch/riscv/lib/dtb.c
index 8c2f5b2518..aa28795387 100644
--- a/arch/riscv/lib/dtb.c
+++ b/arch/riscv/lib/dtb.c
@@ -9,6 +9,7 @@
 static int of_riscv_init(void)
 {
 	void *fdt;
+	int ret;
 
 	/* See if we are provided a dtb in boarddata */
 	fdt = barebox_riscv_boot_dtb();
@@ -20,11 +21,11 @@ static int of_riscv_init(void)
 	pr_debug("using boarddata provided DTB\n");
 
 
-	barebox_register_fdt(fdt);
+	ret = barebox_register_fdt(fdt);
 
 	/* do it now, before clocksource drivers run postcore */
 	timer_init();
 
-	return 0;
+	return ret;
 }
 core_initcall(of_riscv_init);
diff --git a/arch/sandbox/board/dtb.c b/arch/sandbox/board/dtb.c
index 4a8cbfb26f..98d2e774b8 100644
--- a/arch/sandbox/board/dtb.c
+++ b/arch/sandbox/board/dtb.c
@@ -39,8 +39,6 @@ static int of_sandbox_init(void)
 	if (!dtb)
 		dtb = __dtb_sandbox_start;
 
-	barebox_register_fdt(dtb);
-
-	return 0;
+	return barebox_register_fdt(dtb);
 }
 core_initcall(of_sandbox_init);
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 6fe02649ee..b99201a50f 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1699,32 +1699,34 @@ int of_set_root_node(struct device_node *node)
 	return 0;
 }
 
-void barebox_register_of(struct device_node *root)
+int barebox_register_of(struct device_node *root)
 {
 	if (root_node)
-		return;
+		return -EBUSY;
 
 	of_set_root_node(root);
 	of_fix_tree(root);
 
 	if (IS_ENABLED(CONFIG_OFDEVICE))
-		of_probe();
+		return of_probe();
+
+	return 0;
 }
 
-void barebox_register_fdt(const void *dtb)
+int barebox_register_fdt(const void *dtb)
 {
 	struct device_node *root;
 
 	if (root_node)
-		return;
+		return -EBUSY;
 
 	root = of_unflatten_dtb(dtb);
 	if (IS_ERR(root)) {
 		pr_err("Cannot unflatten dtb: %pe\n", root);
-		return;
+		return PTR_ERR(root);
 	}
 
-	barebox_register_of(root);
+	return barebox_register_of(root);
 }
 
 /**
diff --git a/include/of.h b/include/of.h
index 645f429bde..66d1edcc5c 100644
--- a/include/of.h
+++ b/include/of.h
@@ -261,8 +261,8 @@ extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 
 extern struct device_node *of_get_root_node(void);
 extern int of_set_root_node(struct device_node *node);
-extern void barebox_register_of(struct device_node *root);
-extern void barebox_register_fdt(const void *dtb);
+extern int barebox_register_of(struct device_node *root);
+extern int barebox_register_fdt(const void *dtb);
 
 extern struct device_d *of_platform_device_create(struct device_node *np,
 						struct device_d *parent);