linux-kernel - [PATCH AUTOSEL 5.7 088/388] sparc32: mm: Don't try to free page-table pages if ctor() fails

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Message-Id: <20200618010805.600873-88-sashal@kernel.org>
Date:   Wed, 17 Jun 2020 21:03:05 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Sasha Levin <sashal@...nel.org>, sparclinux@...r.kernel.org
Subject: [PATCH AUTOSEL 5.7 088/388] sparc32: mm: Don't try to free page-table pages if ctor() fails

From: Will Deacon <will@...nel.org>

[ Upstream commit 454b0289c6b5f2c66164654b80212d15fbef7a03 ]

The pages backing page-table allocations for SRMMU are allocated via
memblock as part of the "nocache" region initialisation during
srmmu_paging_init() and should not be freed even if a later call to
pgtable_pte_page_ctor() fails.

Remove the broken call to __free_page().

Cc: David S. Miller <davem@...emloft.net>
Cc: Kirill A. Shutemov <kirill@...temov.name>
Fixes: 1ae9ae5f7df7 ("sparc: handle pgtable_page_ctor() fail")
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/sparc/mm/srmmu.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index a8c2f2615fc6..ecc9e8786d57 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -383,7 +383,6 @@ pgtable_t pte_alloc_one(struct mm_struct *mm)
 		return NULL;
 	page = pfn_to_page(__nocache_pa(pte) >> PAGE_SHIFT);
 	if (!pgtable_pte_page_ctor(page)) {
-		__free_page(page);
 		return NULL;
 	}
 	return page;
-- 
2.25.1