s390/vmcp: correct early_param handling

Check "p" is not NULL before passing it to memparse, which doesn't
handle that case explicitly.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 0fa1b6b..9e06628 100644 (file)
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -43,6 +43,8 @@ static struct cma *vmcp_cma;
 
 static int __init early_parse_vmcp_cma(char *p)
 {
+       if (!p)
+               return 1;
        vmcp_cma_size = ALIGN(memparse(p, NULL), PAGE_SIZE);
        return 0;
 }