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 DBAC9C4332F for ; Wed, 23 Nov 2022 09:13:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237088AbiKWJNB (ORCPT ); Wed, 23 Nov 2022 04:13:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53840 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237189AbiKWJM5 (ORCPT ); Wed, 23 Nov 2022 04:12:57 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C5A7E11 for ; Wed, 23 Nov 2022 01:12:56 -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 dfw.source.kernel.org (Postfix) with ESMTPS id C969661B43 for ; Wed, 23 Nov 2022 09:12:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A2107C433C1; Wed, 23 Nov 2022 09:12:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669194775; bh=j3G6crzfqGAtagzE3aEJ5BavhB3USdbpqR/0RJgxfGU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vl39ghCPzAf4Ce0mTABdaKQdoChcbGd2YTvPko5YnPc6qOR9MSykBPKsnaxbjjKtm 6lN27OJK9AIvGsrra5X7syri9iUiNiEWY9CWx8o4gTD3BzCke0sD206751kvlXzkKx 9FSNYSZKVRYODG55DF7enrxp3K7EZn6lCUM0oyBk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Peter Rosin , Tudor Ambarus , Nicolas Ferre , Vinod Koul Subject: [PATCH 5.4 057/156] dmaengine: at_hdmac: Dont start transactions at tx_submit level Date: Wed, 23 Nov 2022 09:50:14 +0100 Message-Id: <20221123084600.012333722@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221123084557.816085212@linuxfoundation.org> References: <20221123084557.816085212@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tudor Ambarus commit 7176a6a8982d311e50a7c1168868d26e65bbba19 upstream. tx_submit is supposed to push the current transaction descriptor to a pending queue, waiting for issue_pending() to be called. issue_pending() must start the transfer, not tx_submit(), thus remove atc_dostart() from atc_tx_submit(). Clients of at_xdmac that assume that tx_submit() starts the transfer must be updated and call dma_async_issue_pending() if they miss to call it. The vdbg print was moved to after the lock is released. It is desirable to do the prints without the lock held if possible, and because the if statement disappears there's no reason why to do the print while holding the lock. 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/20221025090306.297886-3-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/dma/at_hdmac.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -674,19 +674,11 @@ static dma_cookie_t atc_tx_submit(struct spin_lock_irqsave(&atchan->lock, flags); cookie = dma_cookie_assign(tx); - if (list_empty(&atchan->active_list)) { - dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n", - desc->txd.cookie); - atc_dostart(atchan, desc); - list_add_tail(&desc->desc_node, &atchan->active_list); - } else { - dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n", - desc->txd.cookie); - list_add_tail(&desc->desc_node, &atchan->queue); - } - + list_add_tail(&desc->desc_node, &atchan->queue); spin_unlock_irqrestore(&atchan->lock, flags); + dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n", + desc->txd.cookie); return cookie; }