NFS: Ensure nfs_readpage returns promptly when internal error occurs
A previous refactoring of nfs_readpage() might end up calling wait_on_page_locked_killable() even if readpage_async_filler() failed with an internal error and pg_error was non-zero (for example, if nfs_create_request() failed). In the case of an internal error, skip over wait_on_page_locked_killable() as this is only needed when the read is sent and an error occurs during completion handling. Signed-off-by: Dave Wysochanski <dwysocha@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
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