From patchwork Fri Dec 6 13:53:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sascha Hauer X-Patchwork-Id: 11276185 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4392F109A for ; Fri, 6 Dec 2019 13:53:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2B94024679 for ; Fri, 6 Dec 2019 13:53:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726171AbfLFNxs (ORCPT ); Fri, 6 Dec 2019 08:53:48 -0500 Received: from metis.ext.pengutronix.de ([85.220.165.71]:49163 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726386AbfLFNxs (ORCPT ); Fri, 6 Dec 2019 08:53:48 -0500 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1idE3G-0008N9-Nb; Fri, 06 Dec 2019 14:53:46 +0100 Received: from sha by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1idE3F-0001E9-Nj; Fri, 06 Dec 2019 14:53:45 +0100 From: Sascha Hauer To: dmaengine@vger.kernel.org Cc: Vinod Koul , Pengutronix Kernel Team , NXP Linux Team , Peter Ujfalusi , Robert Jarzmik , Sascha Hauer Subject: [PATCH 1/5] dmaengine: virt-dma: Add missing locking around list operations Date: Fri, 6 Dec 2019 14:53:40 +0100 Message-Id: <20191206135344.29330-2-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191206135344.29330-1-s.hauer@pengutronix.de> References: <20191206135344.29330-1-s.hauer@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: dmaengine@vger.kernel.org Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org All list operations are protected by &vc->lock. As vchan_vdesc_fini() is called unlocked add the missing locking around the list operations. Signed-off-by: Sascha Hauer --- drivers/dma/virt-dma.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h index ab158bac03a7..41883ee2c29f 100644 --- a/drivers/dma/virt-dma.h +++ b/drivers/dma/virt-dma.h @@ -113,10 +113,15 @@ static inline void vchan_vdesc_fini(struct virt_dma_desc *vd) { struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan); - if (dmaengine_desc_test_reuse(&vd->tx)) + if (dmaengine_desc_test_reuse(&vd->tx)) { + unsigned long flags; + + spin_lock_irqsave(&vc->lock, flags); list_add(&vd->node, &vc->desc_allocated); - else + spin_unlock_irqrestore(&vc->lock, flags); + } else { vc->desc_free(vd); + } } /**