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arm64: kernel: do not mark reserved memory regions as IORESOURCE_BUSY 

Memory regions marked as NOMAP should not be used for general allocation
by the kernel, and should not even be covered by the linear mapping
(hence the name). However, drivers or other subsystems (such as ACPI)
that access the firmware directly may legally access them, which means
it is also reasonable for such drivers to claim them by invoking
request_resource(). Currently, this is prevented by the fact that arm64's
request_standard_resources() marks reserved regions as IORESOURCE_BUSY.

So drop the IORESOURCE_BUSY flag from these requests.

Reported-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Ard Biesheuvel 2017-01-24 17:11:40 +00:00 committed by Will Deacon
parent 1c33dc1015
commit 79ba11d24b
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/setup.c
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@ -209,7 +209,7 @@ static void __init request_standard_resources(void)
res = alloc_bootmem_low(sizeof(*res));
if (memblock_is_nomap(region)) {
res->name = "reserved";
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
res->flags = IORESOURCE_MEM;
} else {
res->name = "System RAM";
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;