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Message-ID: <20180409001936.162706-95-alexander.levin@microsoft.com> Date: Mon, 9 Apr 2018 00:21:06 +0000 From: Sasha Levin <Alexander.Levin@...rosoft.com> To: "stable@...r.kernel.org" <stable@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: Jan H. Schönherr <jschoenh@...zon.de>, Matthew Wilcox <mawilcox@...rosoft.com>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Sasha Levin <Alexander.Levin@...rosoft.com> Subject: [PATCH AUTOSEL for 4.14 095/161] fs/dax.c: release PMD lock even when there is no PMD support in DAX From: Jan H. Schönherr <jschoenh@...zon.de> [ Upstream commit ee190ca6516bc8257e3d36187ca6f0f71a9ec477 ] follow_pte_pmd() can theoretically return after having acquired a PMD lock, even when DAX was not compiled with CONFIG_FS_DAX_PMD. Release the PMD lock unconditionally. Link: http://lkml.kernel.org/r/20180118133839.20587-1-jschoenh@amazon.de Fixes: f729c8c9b24f ("dax: wrprotect pmd_t in dax_mapping_entry_mkclean") Signed-off-by: Jan H. Schönherr <jschoenh@...zon.de> Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com> Reviewed-by: Andrew Morton <akpm@...ux-foundation.org> Cc: Matthew Wilcox <mawilcox@...rosoft.com> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com> --- fs/dax.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/dax.c b/fs/dax.c index 191306cd8b6b..ddb4981ae32e 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -630,8 +630,8 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping, set_pmd_at(vma->vm_mm, address, pmdp, pmd); mmu_notifier_invalidate_range(vma->vm_mm, start, end); unlock_pmd: - spin_unlock(ptl); #endif + spin_unlock(ptl); } else { if (pfn != pte_pfn(*ptep)) goto unlock_pte; -- 2.15.1
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