From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7E6BC433EF for ; Tue, 7 Jun 2022 17:33:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347139AbiFGRdd (ORCPT ); Tue, 7 Jun 2022 13:33:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346370AbiFGRYP (ORCPT ); Tue, 7 Jun 2022 13:24:15 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B1604C78A; Tue, 7 Jun 2022 10:22:27 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id EF9D7B8220B; Tue, 7 Jun 2022 17:22:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63D48C385A5; Tue, 7 Jun 2022 17:22:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654622544; bh=cEhWmMxXvdBKqxo8lID1YPL2df86SOavf20+AeO8pMM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qK8Tm20YbBD6WWgDZg2ICrUUyhuyTrvBQmoAi0vehrrhJYZyaHZqVLtVSm8vA+7sY NHYqh6bCjj3pibI871SSBB8aE7wrymb9vYhgq8ePrPdRdW89wfLUp0N28aqPdiK0a2 Km1Ve3HVEo2YlwWraJpqjeYi1pVgvn0Ov61PuKbM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Niels Dossche , Jason Gunthorpe , Sasha Levin Subject: [PATCH 5.10 097/452] IB/rdmavt: add missing locks in rvt_ruc_loopback Date: Tue, 7 Jun 2022 18:59:14 +0200 Message-Id: <20220607164911.449017513@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607164908.521895282@linuxfoundation.org> References: <20220607164908.521895282@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Niels Dossche [ Upstream commit 22cbc6c2681a0a4fe76150270426e763d52353a4 ] The documentation of the function rvt_error_qp says both r_lock and s_lock need to be held when calling that function. It also asserts using lockdep that both of those locks are held. rvt_error_qp is called form rvt_send_cq, which is called from rvt_qp_complete_swqe, which is called from rvt_send_complete, which is called from rvt_ruc_loopback in two places. Both of these places do not hold r_lock. Fix this by acquiring a spin_lock of r_lock in both of these places. The r_lock acquiring cannot be added in rvt_qp_complete_swqe because some of its other callers already have r_lock acquired. Link: https://lore.kernel.org/r/20220228195144.71946-1-dossche.niels@gmail.com Signed-off-by: Niels Dossche Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/sw/rdmavt/qp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c index d8d52a00a1be..585a9c76e518 100644 --- a/drivers/infiniband/sw/rdmavt/qp.c +++ b/drivers/infiniband/sw/rdmavt/qp.c @@ -2826,7 +2826,7 @@ void rvt_qp_iter(struct rvt_dev_info *rdi, EXPORT_SYMBOL(rvt_qp_iter); /* - * This should be called with s_lock held. + * This should be called with s_lock and r_lock held. */ void rvt_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, enum ib_wc_status status) @@ -3185,7 +3185,9 @@ void rvt_ruc_loopback(struct rvt_qp *sqp) rvp->n_loop_pkts++; flush_send: sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; + spin_lock(&sqp->r_lock); rvt_send_complete(sqp, wqe, send_status); + spin_unlock(&sqp->r_lock); if (local_ops) { atomic_dec(&sqp->local_ops_pending); local_ops = 0; @@ -3239,7 +3241,9 @@ void rvt_ruc_loopback(struct rvt_qp *sqp) spin_unlock_irqrestore(&qp->r_lock, flags); serr_no_r_lock: spin_lock_irqsave(&sqp->s_lock, flags); + spin_lock(&sqp->r_lock); rvt_send_complete(sqp, wqe, send_status); + spin_unlock(&sqp->r_lock); if (sqp->ibqp.qp_type == IB_QPT_RC) { int lastwqe; -- 2.35.1