From: Xianting Tian xianting.tian@linux.alibaba.com
commit e61bf5c071148c80d091f8e7220b3b9130780ae3 upstream.
Commit 00ab027a3b82 ("RISC-V: Add kernel image sections to the resource tree") marked IORESOURCE_BUSY for reserved memory, which caused resource map failed in subsequent operations of related driver, so remove the IORESOURCE_BUSY flag. In order to prohibit userland mapping reserved memory, mark IORESOURCE_EXCLUSIVE for it.
The code to reproduce the issue, dts: mem0: memory@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@alibaba-inc.com Reviewed-by: Guo Ren guoren@kernel.org Reviewed-by: Heiko Stuebner heiko@sntech.de Tested-by: Heiko Stuebner heiko@sntech.de Co-developed-by: Nick Kossifidis mick@ics.forth.gr Signed-off-by: Xianting Tian xianting.tian@linux.alibaba.com Link: https://lore.kernel.org/r/20220518013428.1338983-1-xianting.tian@linux.aliba... Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/kernel/setup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -189,7 +189,7 @@ static void __init init_resources(void) res = &mem_res[res_idx--];
res->name = "Reserved"; - res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; + res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE; res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
@@ -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 | IORESOURCE_EXCLUSIVE; } else { res->name = "System RAM"; res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;