[PATCH v5 1/4] xen/arm: bootfdt: Make process_chosen_node() return int

[Henry Wang <Henry.Wang@arm.com>]

At the boot time, it is saner to stop booting early if an error occurs
when parsing the device tree chosen node, rather than seeing random
behavior afterwards. Therefore, this commit changes the return type of
the process_chosen_node() from void to int, and return correct errno
based on the error type.

Signed-off-by: Henry Wang <Henry.Wang@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Acked-by: Julien Grall <jgrall@amazon.com>
---
Changes from v4 to v5:
- No changes.
Changes from v3 to v4:
- Add Reviewed-by from Michal and Acked-by from Julien.
Changes from v2 to v3:
- Adjust the order of this patch, make it the #1.
Changes from v1 to v2:
- New commit.
---
 xen/arch/arm/bootfdt.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index ec81a45de9..1a79b969af 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -293,9 +293,9 @@ static void __init process_multiboot_node(const void *fdt, int node,
                      kind, start, domU);
 }
 
-static void __init process_chosen_node(const void *fdt, int node,
-                                       const char *name,
-                                       u32 address_cells, u32 size_cells)
+static int __init process_chosen_node(const void *fdt, int node,
+                                      const char *name,
+                                      u32 address_cells, u32 size_cells)
 {
     const struct fdt_property *prop;
     paddr_t start, end;
@@ -306,11 +306,11 @@ static void __init process_chosen_node(const void *fdt, int node,
     prop = fdt_get_property(fdt, node, "linux,initrd-start", &len);
     if ( !prop )
         /* No initrd present. */
-        return;
+        return 0;
     if ( len != sizeof(u32) && len != sizeof(u64) )
     {
         printk("linux,initrd-start property has invalid length %d\n", len);
-        return;
+        return -EINVAL;
     }
     start = dt_read_number((void *)&prop->data, dt_size_to_cells(len));
 
@@ -318,12 +318,12 @@ static void __init process_chosen_node(const void *fdt, int node,
     if ( !prop )
     {
         printk("linux,initrd-end not present but -start was\n");
-        return;
+        return -EINVAL;
     }
     if ( len != sizeof(u32) && len != sizeof(u64) )
     {
         printk("linux,initrd-end property has invalid length %d\n", len);
-        return;
+        return -EINVAL;
     }
     end = dt_read_number((void *)&prop->data, dt_size_to_cells(len));
 
@@ -331,12 +331,14 @@ static void __init process_chosen_node(const void *fdt, int node,
     {
         printk("linux,initrd limits invalid: %"PRIpaddr" >= %"PRIpaddr"\n",
                   start, end);
-        return;
+        return -EINVAL;
     }
 
     printk("Initrd %"PRIpaddr"-%"PRIpaddr"\n", start, end);
 
     add_boot_module(BOOTMOD_RAMDISK, start, end-start, false);
+
+    return 0;
 }
 
 static int __init process_domain_node(const void *fdt, int node,
@@ -383,7 +385,7 @@ static int __init early_scan_node(const void *fdt,
               device_tree_node_compatible(fdt, node, "multiboot,module" )))
         process_multiboot_node(fdt, node, name, address_cells, size_cells);
     else if ( depth == 1 && device_tree_node_matches(fdt, node, "chosen") )
-        process_chosen_node(fdt, node, name, address_cells, size_cells);
+        rc = process_chosen_node(fdt, node, name, address_cells, size_cells);
     else if ( depth == 2 && device_tree_node_compatible(fdt, node, "xen,domain") )
         rc = process_domain_node(fdt, node, name, address_cells, size_cells);
 
-- 
2.17.1