Recent commit a5f616483110 ("mm/ioremap: add slab availability checking in
ioremap_prot") added the slab availability check to the generic
ioremap_prot() implementation. It is reasonable to be done for the
MIPS32-specific method too since it also relies on the
get_vm_area_caller() function (by means of get_vm_area()) which requires
the slab allocator being up and running before being called.
Signed-off-by: Serge Semin <fancer.lancer@xxxxxxxxx>
---
arch/mips/mm/ioremap.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/mips/mm/ioremap.c b/arch/mips/mm/ioremap.c
index b6dad2fd5575..d8243d61ef32 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.
--
2.42.1
