[S390] Fix memory detection.

Yet another patch in the countless series of memory detection fixes:
if the last area of the reported storage size is a hole the detection
loop will loop forever.
Just break chunk detection loop if its end is going to be larger than
reported storage size.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index e6289ee74ecd..8bf4ae1150be 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -200,11 +200,13 @@ static noinline __init void find_memory_chunks(unsigned long memsize)
                 cc = __tprot(addr);
                 while (cc == old_cc) {
                         addr += CHUNK_INCR;
-                        cc = __tprot(addr);
+                        if (addr >= memsize)
+                                break;
 #ifndef CONFIG_64BIT
                         if (addr == ADDR2G)
                                 break;
 #endif
+                        cc = __tprot(addr);
                 }
 
                 if (old_addr != addr &&