From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:42458 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725941AbeITGTX (ORCPT ); Thu, 20 Sep 2018 02:19:23 -0400 Date: Wed, 19 Sep 2018 17:38:51 -0700 From: Vinod To: Sasha Levin Cc: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Andy Shevchenko Subject: Re: [PATCH AUTOSEL 4.9 30/34] dmaengine: hsu: Support dmaengine_terminate_sync() Message-ID: <20180920003851.GA2350@vkoul-mobl> References: <20180915013422.180023-1-alexander.levin@microsoft.com> <20180915013422.180023-30-alexander.levin@microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180915013422.180023-30-alexander.levin@microsoft.com> Sender: stable-owner@vger.kernel.org List-ID: On 15-09-18, 01:34, Sasha Levin wrote: > From: Andy Shevchenko > > [ Upstream commit 2abc66cd499aa16876e45c6438788902f7d1ce22 ] > > It appears that the driver misses the support of dmaengine_terminate_sync(). > Since many of callers expects this behaviour implement the new > device_synchronize() callback to allow proper synchronization when stopping > a channel. This adds missing support for an optional call, but I am not aware of any reports of breakage due to missing this patch. Do you want to carry this for stable? > Fixes: b36f09c3c441 ("dmaengine: Add transfer termination synchronization support") > Signed-off-by: Andy Shevchenko > Signed-off-by: Vinod Koul > Signed-off-by: Sasha Levin > --- > drivers/dma/hsu/hsu.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c > index 29d04ca71d52..202ffa9f7611 100644 > --- a/drivers/dma/hsu/hsu.c > +++ b/drivers/dma/hsu/hsu.c > @@ -413,6 +413,13 @@ static void hsu_dma_free_chan_resources(struct dma_chan *chan) > vchan_free_chan_resources(to_virt_chan(chan)); > } > > +static void hsu_dma_synchronize(struct dma_chan *chan) > +{ > + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); > + > + vchan_synchronize(&hsuc->vchan); > +} > + > int hsu_dma_probe(struct hsu_dma_chip *chip) > { > struct hsu_dma *hsu; > @@ -459,6 +466,7 @@ int hsu_dma_probe(struct hsu_dma_chip *chip) > hsu->dma.device_pause = hsu_dma_pause; > hsu->dma.device_resume = hsu_dma_resume; > hsu->dma.device_terminate_all = hsu_dma_terminate_all; > + hsu->dma.device_synchronize = hsu_dma_synchronize; > > hsu->dma.src_addr_widths = HSU_DMA_BUSWIDTHS; > hsu->dma.dst_addr_widths = HSU_DMA_BUSWIDTHS; > -- > 2.17.1 -- ~Vinod