powerpc/powernv: Treat an empty reboot string as default

Treat an empty reboot cmd string the same as a NULL string. This squashes a
spurious unsupported reboot message that sometimes gets out when using
xmon.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200217024833.30580-1-oohall@gmail.com

diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 11fdae8..a8fe630 100644 (file)
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -229,7 +229,7 @@ static void  __noreturn pnv_restart(char *cmd)
        pnv_prepare_going_down();
 
        do {
-               if (!cmd)
+               if (!cmd || !strlen(cmd))
                        rc = opal_cec_reboot();
                else if (strcmp(cmd, "full") == 0)
                        rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL);