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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 45F66C47DD9 for ; Wed, 27 Mar 2024 12:32:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BxJjUiJ56KOZtMsuAFQ+6aT+plzdWjei2mhIQRZLpyk=; b=XfTfZCen57BruQ TE7OsWMya3tDu7nqo4y9Ou+1d1CwA8Oh5h0GP7knaQ9kSc+MwP1wOfOkLzZYk47DALlWN6LPm8NFG B+ZELkAalqJtZ/RUFajW8Qr2r5y2WmJxSSbdmXV2RGIscNWUR/QQKnnc+reawXdRrbFZ0c2UAhAPn I2fbVl7bQZXvgDyk24xaXuIZI7qvK1qurwMJKb7oBXG3gt1EaRchnVcGq4sffm3THHcsJYFQWzFV/ kZMzuakafx+pMa4y92OIJdiBreS9AiFuZXa76s6DNpLWuMq7a8qavxx/FKtp0zoAqzuZPpXxD7kSp EfIFceEyosyv2wb7bwzw==; 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charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 28/02/2024 06:21, Vishal Sagar wrote: > From: Neel Gandhi > > The vchan_next_desc() function, called from > xilinx_dpdma_chan_queue_transfer(), must be called with > virt_dma_chan.lock held. This isn't correctly handled in all code paths, > resulting in a race condition between the .device_issue_pending() > handler and the IRQ handler which causes DMA to randomly stop. Fix it by > taking the lock around xilinx_dpdma_chan_queue_transfer() calls that are > missing it. > > Signed-off-by: Neel Gandhi > Signed-off-by: Radhey Shyam Pandey > Signed-off-by: Tomi Valkeinen > Signed-off-by: Vishal Sagar Sean posted almost identical, but very slightly better patch, for this, so I think we can pick that one instead. Tomi > > Link: https://lore.kernel.org/all/20220122121407.11467-1-neel.gandhi@xilinx.com > --- > drivers/dma/xilinx/xilinx_dpdma.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/dma/xilinx/xilinx_dpdma.c b/drivers/dma/xilinx/xilinx_dpdma.c > index b82815e64d24..28d9af8f00f0 100644 > --- a/drivers/dma/xilinx/xilinx_dpdma.c > +++ b/drivers/dma/xilinx/xilinx_dpdma.c > @@ -1097,12 +1097,14 @@ static void xilinx_dpdma_chan_vsync_irq(struct xilinx_dpdma_chan *chan) > * Complete the active descriptor, if any, promote the pending > * descriptor to active, and queue the next transfer, if any. > */ > + spin_lock(&chan->vchan.lock); > if (chan->desc.active) > vchan_cookie_complete(&chan->desc.active->vdesc); > chan->desc.active = pending; > chan->desc.pending = NULL; > > xilinx_dpdma_chan_queue_transfer(chan); > + spin_unlock(&chan->vchan.lock); > > out: > spin_unlock_irqrestore(&chan->lock, flags); > @@ -1264,10 +1266,12 @@ static void xilinx_dpdma_issue_pending(struct dma_chan *dchan) > struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan); > unsigned long flags; > > - spin_lock_irqsave(&chan->vchan.lock, flags); > + spin_lock_irqsave(&chan->lock, flags); > + spin_lock(&chan->vchan.lock); > if (vchan_issue_pending(&chan->vchan)) > xilinx_dpdma_chan_queue_transfer(chan); > - spin_unlock_irqrestore(&chan->vchan.lock, flags); > + spin_unlock(&chan->vchan.lock); > + spin_unlock_irqrestore(&chan->lock, flags); > } > > static int xilinx_dpdma_config(struct dma_chan *dchan, > @@ -1495,7 +1499,9 @@ static void xilinx_dpdma_chan_err_task(struct tasklet_struct *t) > XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id); > > spin_lock_irqsave(&chan->lock, flags); > + spin_lock(&chan->vchan.lock); > xilinx_dpdma_chan_queue_transfer(chan); > + spin_unlock(&chan->vchan.lock); > spin_unlock_irqrestore(&chan->lock, flags); > } > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel