fs/dax.c: release PMD lock even when there is no PMD support in DAX
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: f729c8c9 ("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>
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