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-rw-r--r--arch/mips/mm/ioremap.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/mips/mm/ioremap.c b/arch/mips/mm/ioremap.c
index b6dad2fd55..d8243d61ef 100644
--- a/arch/mips/mm/ioremap.c
+++ b/arch/mips/mm/ioremap.c
@@ -72,6 +72,10 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
flags == _CACHE_UNCACHED)
return (void __iomem *) CKSEG1ADDR(phys_addr);
+ /* Early remaps should use the unmapped regions til' VM is available */
+ if (WARN_ON_ONCE(!slab_is_available()))
+ return NULL;
+
/*
* Don't allow anybody to remap RAM that may be allocated by the page
* allocator, since that could lead to races & data clobbering.