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If ->request_prepare() detects an error, it sets ->rq_task->tk_status. This is easy for callers to ignore. The only caller is xprt_request_enqueue_receive() and it does ignore the error, as does call_encode() which calls it. This can result in a request being queued to receive a reply without an allocated receive buffer. So instead of setting rq_task->tk_status, return an error, and store in ->tk_status only in call_encode(); The call to xprt_request_enqueue_receive() is now earlier in call_encode(), where the error can still be handled. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>