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fs/dax.c: release PMD lock even when there is no PMD support in DAX
[ Upstream commitee190ca651
] 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:f729c8c9b2
("dax: wrprotect pmd_t in dax_mapping_entry_mkclean") Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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fs/dax.c
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fs/dax.c
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@ -630,8 +630,8 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping,
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set_pmd_at(vma->vm_mm, address, pmdp, pmd);
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mmu_notifier_invalidate_range(vma->vm_mm, start, end);
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unlock_pmd:
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spin_unlock(ptl);
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#endif
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spin_unlock(ptl);
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} else {
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if (pfn != pte_pfn(*ptep))
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goto unlock_pte;
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