From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755684AbdKNOdN (ORCPT ); Tue, 14 Nov 2017 09:33:13 -0500 Received: from lelnx193.ext.ti.com ([198.47.27.77]:10853 "EHLO lelnx193.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755574AbdKNOc2 (ORCPT ); Tue, 14 Nov 2017 09:32:28 -0500 From: Peter Ujfalusi To: CC: , , , Subject: [PATCH 08/10] dmaengine: img-mdc-dma: Use vchan_terminate_vdesc() instead of desc_free Date: Tue, 14 Nov 2017 16:32:10 +0200 Message-ID: <20171114143212.8311-9-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20171114143212.8311-1-peter.ujfalusi@ti.com> References: <20171114143212.8311-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To avoid race with vchan_complete, use the race free way to terminate running transfer. Implement the device_synchronize callback to make sure that the terminated descriptor is freed. Signed-off-by: Peter Ujfalusi --- drivers/dma/img-mdc-dma.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/dma/img-mdc-dma.c b/drivers/dma/img-mdc-dma.c index 0391f930aecc..25cec9c243e1 100644 --- a/drivers/dma/img-mdc-dma.c +++ b/drivers/dma/img-mdc-dma.c @@ -694,7 +694,6 @@ static unsigned int mdc_get_new_events(struct mdc_chan *mchan) static int mdc_terminate_all(struct dma_chan *chan) { struct mdc_chan *mchan = to_mdc_chan(chan); - struct mdc_tx_desc *mdesc; unsigned long flags; LIST_HEAD(head); @@ -703,21 +702,28 @@ static int mdc_terminate_all(struct dma_chan *chan) mdc_chan_writel(mchan, MDC_CONTROL_AND_STATUS_CANCEL, MDC_CONTROL_AND_STATUS); - mdesc = mchan->desc; - mchan->desc = NULL; + if (mchan->desc) { + vchan_terminate_vdesc(&mchan->desc->vd); + mchan->desc = NULL; + } vchan_get_all_descriptors(&mchan->vc, &head); mdc_get_new_events(mchan); spin_unlock_irqrestore(&mchan->vc.lock, flags); - if (mdesc) - mdc_desc_free(&mdesc->vd); vchan_dma_desc_free_list(&mchan->vc, &head); return 0; } +static void mdc_synchronize(struct dma_chan *chan) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + + vchan_synchronize(&mchan->vc); +} + static int mdc_slave_config(struct dma_chan *chan, struct dma_slave_config *config) { @@ -952,6 +958,7 @@ static int mdc_dma_probe(struct platform_device *pdev) mdma->dma_dev.device_tx_status = mdc_tx_status; mdma->dma_dev.device_issue_pending = mdc_issue_pending; mdma->dma_dev.device_terminate_all = mdc_terminate_all; + mdma->dma_dev.device_synchronize = mdc_synchronize; mdma->dma_dev.device_config = mdc_slave_config; mdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); -- Peter Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki