nfs: Fix a missed page unlock after pg_doio()
commit fdbd1a2e4a71adcb1ae219fcfd964930d77a7f84 upstream. We must check pg_error and call error_cleanup after any call to pg_doio. Currently, we are skipping the unlock of a page if we encounter an error in nfs_pageio_complete() before handing off the work to the RPC layer. Signed-off-by: NBenjamin Coddington <bcodding@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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