1 files changed, 3 insertions, 1 deletions

diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index e43ec600afc..18623ba751b 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -341,6 +341,8 @@ int pmb_bolt_mapping(unsigned long vaddr, phys_addr_t phys,
         unsigned long flags, pmb_flags;
         int i, mapped;
 
+        if (size < SZ_16M)
+                return -EINVAL;
         if (!pmb_addr_valid(vaddr, size))
                 return -EFAULT;
         if (pmb_mapping_exists(vaddr, phys, size))
@@ -680,7 +682,7 @@ static void __init pmb_merge(struct pmb_entry *head)
         /*
          * The merged page size must be valid.
          */
-        if (!pmb_size_valid(newsize))
+        if (!depth || !pmb_size_valid(newsize))
                 return;
 
         head->flags &= ~PMB_SZ_MASK;