From patchwork Wed Feb 3 21:58:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gustavo Pimentel X-Patchwork-Id: 12065495 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 71DCAC433E6 for ; Wed, 3 Feb 2021 22:00:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3BDA364F6D for ; Wed, 3 Feb 2021 22:00:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232763AbhBCWAd (ORCPT ); Wed, 3 Feb 2021 17:00:33 -0500 Received: from smtprelay-out1.synopsys.com ([149.117.87.133]:52244 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232313AbhBCV70 (ORCPT ); Wed, 3 Feb 2021 16:59:26 -0500 Received: from mailhost.synopsys.com (mdc-mailhost1.synopsys.com [10.225.0.209]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id E769FC011B; Wed, 3 Feb 2021 21:58:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1612389506; bh=71t8kLn/h4uRT+rZrsVOIM9WjcoyjC97XsyNd4xo0/8=; h=From:To:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=RgfJV1LBCuVzrk7nQeg5tDASzoie2bzlzyQv4mQhuaIsPuFBooMy1T2A8eX/4hly3 r25bPn02ezYWW96rZiXQPpaVF5uc77i2vKRpBk8cHnksostFwm6dJxHdi8TB65Mvd/ LmKMQT1r/3TSV7L/Fv77g5h/DephWcfwm4/a7cS41RmNv9CY8EOBGtQYVdsyoDE3Nc U5+Qwg1HGfahlameacyYLeuqa6R4SlwAKr0+IPbKUs8NMDOv1KZb03fdLgxbptWnVT 3bYtEq7IoYRWau1Gnbish55wTo3onD8fqFL4zMXbf7FQbeRoMDD7tVsHqpCaU1XKdB 3tcn6Y46P9KqQ== Received: from de02dwia024.internal.synopsys.com (de02dwia024.internal.synopsys.com [10.225.19.81]) by mailhost.synopsys.com (Postfix) with ESMTP id B94FBA024B; Wed, 3 Feb 2021 21:58:24 +0000 (UTC) X-SNPS-Relay: synopsys.com From: Gustavo Pimentel To: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, Vinod Koul , Dan Williams , Bjorn Helgaas , Gustavo Pimentel Subject: [PATCH v4 12/15] dmaengine: dw-edma: Fix crash on loading/unloading driver Date: Wed, 3 Feb 2021 22:58:03 +0100 Message-Id: <50d35480bcb5a7ea33649bbbcf296e148f5977b5.1612389406.git.gustavo.pimentel@synopsys.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org When the driver is compiled as a module and loaded if we try to unload it, the Kernel shows a crash log. This Kernel crash is due to the dma_async_device_unregister() call done after deleting the channels, this patch fixes this issue. Signed-off-by: Gustavo Pimentel --- drivers/dma/dw-edma/dw-edma-core.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c index 8d8292e..f7a1930 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -986,22 +986,21 @@ int dw_edma_remove(struct dw_edma_chip *chip) /* Power management */ pm_runtime_disable(dev); + /* Deregister eDMA device */ + dma_async_device_unregister(&dw->wr_edma); list_for_each_entry_safe(chan, _chan, &dw->wr_edma.channels, vc.chan.device_node) { - list_del(&chan->vc.chan.device_node); tasklet_kill(&chan->vc.task); + list_del(&chan->vc.chan.device_node); } + dma_async_device_unregister(&dw->rd_edma); list_for_each_entry_safe(chan, _chan, &dw->rd_edma.channels, vc.chan.device_node) { - list_del(&chan->vc.chan.device_node); tasklet_kill(&chan->vc.task); + list_del(&chan->vc.chan.device_node); } - /* Deregister eDMA device */ - dma_async_device_unregister(&dw->wr_edma); - dma_async_device_unregister(&dw->rd_edma); - /* Turn debugfs off */ dw_edma_v0_core_debugfs_off(chip);