[U-Boot] [PATCH] armv8: fsl-layerscape: fix hwconfig and prefetching

[Michael Walle]

If CONFIG_HWCONFIG is disabled, hwconfig_subarg_f() will return the
empty string, ie. not NULL. Therefore, we have to check the returned
argument length as well as the return value.

Signed-off-by: Michael Walle <michael at walle.cc>
---
 arch/arm/cpu/armv8/fsl-layerscape/cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index a5d0b5370f..4bb73b524c 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -1073,7 +1073,7 @@ static void config_core_prefetch(void)
 	prefetch_arg = hwconfig_subarg_f("core_prefetch", "disable",
 					 &arglen, buf);
 
-	if (prefetch_arg) {
+	if (arglen && prefetch_arg) {
 		mask = simple_strtoul(prefetch_arg, NULL, 0) & 0xff;
 		if (mask & 0x1) {
 			printf("Core0 prefetch can't be disabled\n");
-- 
2.20.1