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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27982C10F27 for ; Tue, 10 Mar 2020 13:33:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F18D624681 for ; Tue, 10 Mar 2020 13:33:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583847233; bh=22IC65lRb6RwhaXCNj3PkpIhp56hep89oFwc1Ves1Eg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lRIzjxPqCwnbHBWK6jIT/mFHdteZntoDtUJFLtmvIPEb4+4IkGC8mH8vPCA4c6FCD QQ9zfkjmw9Hs8zFq6djn9hQDSkiDpFInZZAj2a0WQ+oq6qzUZA0ZaISvxkziHKkpa5 xQT21swLD6yODpNP65lpIWuEBmchnzH40Wi5XmTc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726475AbgCJMr1 (ORCPT ); Tue, 10 Mar 2020 08:47:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:51266 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728176AbgCJMr1 (ORCPT ); Tue, 10 Mar 2020 08:47:27 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DCFD824691; Tue, 10 Mar 2020 12:47:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583844446; bh=22IC65lRb6RwhaXCNj3PkpIhp56hep89oFwc1Ves1Eg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JJb8UoOkAdufrrtVincHrTc8ITrxORw+noTotWDUGxs8u8GVAECqdyNs2uhSIZ7Oa oEIShKXfzakSwjHDOUdzwhKo+FiStdmE4B1rrBhLbXoKYtcQMkDZ/Kruzx4sbI64TE SIMILjm7dzd5sDa5k4K3Q2Y3UF+iWhpoO14W3Wvo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Vinod Koul Subject: [PATCH 4.9 85/88] dmaengine: coh901318: Fix a double lock bug in dma_tc_handle() Date: Tue, 10 Mar 2020 13:39:33 +0100 Message-Id: <20200310123625.059770813@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200310123606.543939933@linuxfoundation.org> References: <20200310123606.543939933@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dan Carpenter commit 36d5d22090d13fd3a7a8c9663a711cbe6970aac8 upstream. The caller is already holding the lock so this will deadlock. Fixes: 0b58828c923e ("DMAENGINE: COH 901 318 remove irq counting") Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/20200217144050.3i4ymbytogod4ijn@kili.mountain Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/dma/coh901318.c | 4 ---- 1 file changed, 4 deletions(-) --- a/drivers/dma/coh901318.c +++ b/drivers/dma/coh901318.c @@ -1944,8 +1944,6 @@ static void dma_tc_handle(struct coh9013 return; } - spin_lock(&cohc->lock); - /* * When we reach this point, at least one queue item * should have been moved over from cohc->queue to @@ -1966,8 +1964,6 @@ static void dma_tc_handle(struct coh9013 if (coh901318_queue_start(cohc) == NULL) cohc->busy = 0; - spin_unlock(&cohc->lock); - /* * This tasklet will remove items from cohc->active * and thus terminates them.