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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C341C4332F for ; Mon, 14 Nov 2022 11:09:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235936AbiKNLJU (ORCPT ); Mon, 14 Nov 2022 06:09:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235941AbiKNLH6 (ORCPT ); Mon, 14 Nov 2022 06:07:58 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DD95321E3B for ; Mon, 14 Nov 2022 03:07:38 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 9108DB80DDD for ; Mon, 14 Nov 2022 11:07:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B32D5C433D7; Mon, 14 Nov 2022 11:07:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1668424056; bh=OSc55BkCXZrXQFVwW85ZG6GwrNOw4fqtJyzSGBr2Nlg=; h=Subject:To:Cc:From:Date:From; b=mgHGk66/ZEjE1KbNnR0yvZUmCIwHxoJvqVlMoYol7PJ1gkn+ux0hIDCKkiXkI91ys AM7DGHxUrXyMIKYHfKS0aX6UjIzYKnYjtq2z8ZNhbrd7tBgRQDPjxQh22hguBTtq3I nXwcudJL0MMoPgfP39KCLJs8Da++wIlidj9ea+ZM= Subject: FAILED: patch "[PATCH] dmaengine: at_hdmac: Fix premature completion of desc in" failed to apply to 4.14-stable tree To: tudor.ambarus@microchip.com, nicolas.ferre@microchip.com, peda@axentia.se, vkoul@kernel.org Cc: From: Date: Mon, 14 Nov 2022 12:07:28 +0100 Message-ID: <16684240486685@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Possible dependencies: fcd37565efda ("dmaengine: at_hdmac: Fix premature completion of desc in issue_pending") 8a47221fc284 ("dmaengine: at_hdmac: Start transfer for cyclic channels in issue_pending") 078a6506141a ("dmaengine: at_hdmac: Fix deadlocks") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From fcd37565efdaffeac179d0f0ce980ac79bfdf569 Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Tue, 25 Oct 2022 12:02:38 +0300 Subject: [PATCH] dmaengine: at_hdmac: Fix premature completion of desc in issue_pending Multiple calls to atc_issue_pending() could result in a premature completion of a descriptor from the atchan->active list, as the method always completed the first active descriptor from the list. Instead, issue_pending() should just take the first transaction descriptor from the pending queue, move it to active_list and start the transfer. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin Signed-off-by: Tudor Ambarus Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-5-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index e9d0c3632868..cb5522417db6 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -1527,16 +1527,26 @@ atc_tx_status(struct dma_chan *chan, } /** - * atc_issue_pending - try to finish work + * atc_issue_pending - takes the first transaction descriptor in the pending + * queue and starts the transfer. * @chan: target DMA channel */ static void atc_issue_pending(struct dma_chan *chan) { - struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_desc *desc; + unsigned long flags; dev_vdbg(chan2dev(chan), "issue_pending\n"); - atc_advance_work(atchan); + spin_lock_irqsave(&atchan->lock, flags); + if (atc_chan_is_enabled(atchan) || list_empty(&atchan->queue)) + return spin_unlock_irqrestore(&atchan->lock, flags); + + desc = atc_first_queued(atchan); + list_move_tail(&desc->desc_node, &atchan->active_list); + atc_dostart(atchan, desc); + spin_unlock_irqrestore(&atchan->lock, flags); } /**