Messages in this thread Patch in this message | | | From | Baoquan He <> | Subject | [PATCH v4 05/16] mm/ioremap: add slab availability checking in ioremap_prot | Date | Thu, 16 Feb 2023 20:34:08 +0800 |
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Several architectures has done checking if slab if available in ioremap_prot(). In fact it should be done in generic ioremap_prot() since on any architecutre, slab allocator must be available before get_vm_area_caller() and vunmap() are used.
Add the checking into generic_ioremap_prot().
Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Baoquan He <bhe@redhat.com> --- mm/ioremap.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/mm/ioremap.c b/mm/ioremap.c index 9f34a8f90b58..2fbe6b9bc50e 100644 --- a/mm/ioremap.c +++ b/mm/ioremap.c @@ -18,6 +18,10 @@ void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size, phys_addr_t last_addr; struct vm_struct *area; + /* An early platform driver might end up here */ + if (!slab_is_available()) + return NULL; + /* Disallow wrap-around or zero size */ last_addr = phys_addr + size - 1; if (!size || last_addr < phys_addr) -- 2.34.1
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