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| author | Serge Semin <fancer.lancer@gmail.com> | 2023-12-02 14:14:22 +0300 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2023-12-21 17:32:46 +0300 |
| commit | e540b8c5da04c66ff610d3bf84a7566d9f6bffcf (patch) | |
| tree | 0f47c20572222e3f7a61d26e266956cd3a340cf2 /arch/mips | |
| parent | 1c0150229f6a658687c245dfc4dcfa3fae69df49 (diff) | |
| download | linux-e540b8c5da04c66ff610d3bf84a7566d9f6bffcf.tar.xz | |
mips: mm: add slab availability checking in ioremap_prot
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@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/mm/ioremap.c | 4 |
1 files changed, 4 insertions, 0 deletions
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. |