linux-kernel - Re: [PATCH] RISC-V: Remove IORESOURCE_BUSY flag for no-map reserved memory

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Date:   Wed, 11 May 2022 11:32:23 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <xianting.tian@...ux.alibaba.com>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>,
        <akpm@...ux-foundation.org>, <anup@...infault.org>,
        <wangkefeng.wang@...wei.com>, <rppt@...nel.org>, <alex@...ti.fr>,
        <twd2.me@...il.com>, <david@...hat.com>, <seanjc@...gle.com>,
        <petr.pavlu@...e.com>, <atishp@...osinc.com>
CC:     <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <guoren@...nel.org>, <jianghuaming.jhm@...baba-inc.com>,
        <mick@....forth.gr>
Subject: Re: [PATCH] RISC-V: Remove IORESOURCE_BUSY flag for no-map reserved
 memory

On 11/05/2022 12:24, Xianting Tian wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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@...00000 {
>                  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@...baba-inc.com>
> Reviewed-by: Guo Ren <guoren@...nel.org>
> CC: Nick Kossifidis <mick@....forth.gr>
> Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com>

Hey Xianting,
This resend is no different to the patch you sent 5 mins ago, right?
Thanks,
Conor.