[PATCH] RISC-V: Remove IORESOURCE_BUSY flag for no-map reserved memory
David Hildenbrand
david at redhat.com
Wed May 11 05:27:34 PDT 2022
On 11.05.22 13:24, Xianting Tian wrote:
> Commit 00ab027a3b82 ("RISC-V: Add kernel image sections to the resource tree")
> added IORESOURCE_BUSY flag for no-map reserved memory, this casued
> devm_ioremap_resource() failed for the no-map reserved memory in subsequent
> operations of related driver, so remove the IORESOURCE_BUSY flag.
>
> The code to reproduce the issue,
> dts:
> mem0: memory at a0000000 {
> reg = <0x0 0xa0000000 0 0x1000000>;
> no-map;
> };
>
> &test {
> status = "okay";
> memory-region = <&mem0>;
> };
>
> code:
> np = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
> ret = of_address_to_resource(np, 0, &r);
> base = devm_ioremap_resource(&pdev->dev, &r);
> // base = -EBUSY
>
> Fixes: 00ab027a3b82 ("RISC-V: Add kernel image sections to the resource tree")
> Reported-by: Huaming Jiang <jianghuaming.jhm at alibaba-inc.com>
> Reviewed-by: Guo Ren <guoren at kernel.org>
> CC: Nick Kossifidis <mick at ics.forth.gr>
> Signed-off-by: Xianting Tian <xianting.tian at linux.alibaba.com>
> ---
> arch/riscv/kernel/setup.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 834eb652a7b9..71f2966b1474 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -214,7 +214,7 @@ static void __init init_resources(void)
>
> if (unlikely(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;
I assume the "Reserved" part is essentially unused by the kernel correct?
--
Thanks,
David / dhildenb
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