linux-kernel - [PATCH 5.12 468/677] MIPS: loongson64: fix bug when PAGE

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Message-Id: <20210512144852.911877664@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:48:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Huang Pei <huangpei@...ngson.cn>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 468/677] MIPS: loongson64: fix bug when PAGE_SIZE > 16KB

From: Huang Pei <huangpei@...ngson.cn>

[ Upstream commit 509d36a941a3466b78d4377913623d210b162458 ]

When page size larger than 16KB, arguments "vaddr + size(16KB)" in
"ioremap_page_range(vaddr, vaddr + size,...)" called by
"add_legacy_isa_io" is not page-aligned.

As loongson64 needs at least page size 16KB to get rid of cache alias,
and "vaddr" is 64KB-aligned, and 64KB is largest page size supported,
rounding "size" up to PAGE_SIZE is enough for all page size supported.

Fixes: 6d0068ad15e4 ("MIPS: Loongson64: Process ISA Node in DeviceTree")
Signed-off-by: Huang Pei <huangpei@...ngson.cn>
Acked-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/loongson64/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/loongson64/init.c b/arch/mips/loongson64/init.c
index cfa788bca871..1c664b23c0f9 100644
--- a/arch/mips/loongson64/init.c
+++ b/arch/mips/loongson64/init.c
@@ -126,7 +126,7 @@ static int __init add_legacy_isa_io(struct fwnode_handle *fwnode, resource_size_
 		return -ENOMEM;
 
 	range->fwnode = fwnode;
-	range->size = size;
+	range->size = size = round_up(size, PAGE_SIZE);
 	range->hw_start = hw_start;
 	range->flags = LOGIC_PIO_CPU_MMIO;
 
-- 
2.30.2