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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 6124FC4743C for ; Mon, 21 Jun 2021 17:58:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A8B06128E for ; Mon, 21 Jun 2021 17:58:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233721AbhFUSAz (ORCPT ); Mon, 21 Jun 2021 14:00:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:39892 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233324AbhFUR6z (ORCPT ); Mon, 21 Jun 2021 13:58:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BE4666115B; Mon, 21 Jun 2021 17:54:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624298053; bh=Ulm5668ppW40hxOYFzzvuWM+MDIXiaR+Hxem0ej4GCw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u3zIKQV/lYT7d9ZCvnqwHV79kgwE7q+FmTswzWnWCOXosNDwS7cj/+xMs06kQJ0Tr pRYh9UIXQ0nDNjg4oULIOITAuCnGr9vPG5fB0EaNn+qVOOoj8PXApOaeaGaZ5xpUoZ LELelx3bsdEzf6tVdNgIKJgJl3wfPnusW1QJW3JlIelC7ZVPC3/HZdyKQOUFh6gWT2 JNs+6vP3Fpg7Q+qieyxlilymLWeW3vQXeuNueIXG72pzPzQG4RdJsOpomDyDtqcFw/ qodVSrHiaVv+O8XeTXMrh1DqjRI8FtjSKkGkNEvyj5iX9ML6zUu3NFQfnyrnUv33kc e2xy6yy0TEjkQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Guillaume Ranquet , Vinod Koul , Sasha Levin , dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 07/26] dmaengine: mediatek: do not issue a new desc if one is still current Date: Mon, 21 Jun 2021 13:53:40 -0400 Message-Id: <20210621175400.735800-7-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210621175400.735800-1-sashal@kernel.org> References: <20210621175400.735800-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Guillaume Ranquet [ Upstream commit 2537b40b0a4f61d2c83900744fe89b09076be9c6 ] Avoid issuing a new desc if one is still being processed as this can lead to some desc never being marked as completed. Signed-off-by: Guillaume Ranquet Link: https://lore.kernel.org/r/20210513192642.29446-3-granquet@baylibre.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/mediatek/mtk-uart-apdma.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/dma/mediatek/mtk-uart-apdma.c b/drivers/dma/mediatek/mtk-uart-apdma.c index 311d7c236d27..e420e9f72b3d 100644 --- a/drivers/dma/mediatek/mtk-uart-apdma.c +++ b/drivers/dma/mediatek/mtk-uart-apdma.c @@ -204,14 +204,9 @@ static void mtk_uart_apdma_start_rx(struct mtk_chan *c) static void mtk_uart_apdma_tx_handler(struct mtk_chan *c) { - struct mtk_uart_apdma_desc *d = c->desc; - mtk_uart_apdma_write(c, VFF_INT_FLAG, VFF_TX_INT_CLR_B); mtk_uart_apdma_write(c, VFF_INT_EN, VFF_INT_EN_CLR_B); mtk_uart_apdma_write(c, VFF_EN, VFF_EN_CLR_B); - - list_del(&d->vd.node); - vchan_cookie_complete(&d->vd); } static void mtk_uart_apdma_rx_handler(struct mtk_chan *c) @@ -242,9 +237,17 @@ static void mtk_uart_apdma_rx_handler(struct mtk_chan *c) c->rx_status = d->avail_len - cnt; mtk_uart_apdma_write(c, VFF_RPT, wg); +} - list_del(&d->vd.node); - vchan_cookie_complete(&d->vd); +static void mtk_uart_apdma_chan_complete_handler(struct mtk_chan *c) +{ + struct mtk_uart_apdma_desc *d = c->desc; + + if (d) { + list_del(&d->vd.node); + vchan_cookie_complete(&d->vd); + c->desc = NULL; + } } static irqreturn_t mtk_uart_apdma_irq_handler(int irq, void *dev_id) @@ -258,6 +261,7 @@ static irqreturn_t mtk_uart_apdma_irq_handler(int irq, void *dev_id) mtk_uart_apdma_rx_handler(c); else if (c->dir == DMA_MEM_TO_DEV) mtk_uart_apdma_tx_handler(c); + mtk_uart_apdma_chan_complete_handler(c); spin_unlock_irqrestore(&c->vc.lock, flags); return IRQ_HANDLED; @@ -363,7 +367,7 @@ static void mtk_uart_apdma_issue_pending(struct dma_chan *chan) unsigned long flags; spin_lock_irqsave(&c->vc.lock, flags); - if (vchan_issue_pending(&c->vc)) { + if (vchan_issue_pending(&c->vc) && !c->desc) { vd = vchan_next_desc(&c->vc); c->desc = to_mtk_uart_apdma_desc(&vd->tx); -- 2.30.2