[Xen-devel] [PATCH v4 21/53] xen/arch/x86/shutdown.c: let custom parameter parsing routines return errno

[Juergen Gross <jgross@xxxxxxxx>]

Modify the custom parameter parsing routines in:

xen/arch/x86/shutdown.c

to indicate whether the parameter value was parsed successfully.

Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V4:
- issue a message in case of reboot=efi and no EFI runtime services
  (Jan Beulich)

V3:
- dont stop loop at first invalid character (Jan Beulich)
---
 xen/arch/x86/shutdown.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/shutdown.c b/xen/arch/x86/shutdown.c
index f63b8a668f..a87aa60add 100644
--- a/xen/arch/x86/shutdown.c
+++ b/xen/arch/x86/shutdown.c
@@ -51,8 +51,11 @@ static int reboot_mode;
  * efi    Use the EFI reboot (if running under EFI)
  */
 static enum reboot_type reboot_type = BOOT_INVALID;
-static void __init set_reboot_type(char *str)
+
+static int __init set_reboot_type(const char *str)
 {
+    int rc = 0;
+
     for ( ; ; )
     {
         switch ( *str )
@@ -74,6 +77,9 @@ static void __init set_reboot_type(char *str)
         case 't':
             reboot_type = *str;
             break;
+        default:
+            rc = -EINVAL;
+            break;
         }
         if ( (str = strchr(str, ',')) == NULL )
             break;
@@ -81,7 +87,13 @@ static void __init set_reboot_type(char *str)
     }
 
     if ( reboot_type == BOOT_EFI && !efi_enabled(EFI_RS) )
+    {
+        printk("EFI reboot selected, but no EFI runtime services available.\n"
+               "Falling back to default reboot type.\n");
         reboot_type = BOOT_INVALID;
+    }
+
+    return rc;
 }
 custom_param("reboot", set_reboot_type);
 
-- 
2.12.3


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