From patchwork Tue May 26 18:53:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 225253 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 D60CEC433E0 for ; Tue, 26 May 2020 19:26:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B6D0720888 for ; Tue, 26 May 2020 19:26:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590521187; bh=gkOodJPnHPt2bn5Ii9IrOlStnEZJDKD9xkLvRS4kHSQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zXy1RqyIJcukooeUezK8JUKVsTI6viHSeMf4vDfsszW3GPJt6VEk3sIse6tn+AOiW AWuTYhG9rwPGJFcnq3GmbpRBdVULYeB8HoFNr/HiUSBfqDl8nOq1wXio+dlYtS50Cg ZH0GY9hDlM13ae37T4imIGQQNelyhXJXO9NQ3NVI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390522AbgEZT0X (ORCPT ); Tue, 26 May 2020 15:26:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:33692 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391521AbgEZTFl (ORCPT ); Tue, 26 May 2020 15:05:41 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7B54120873; Tue, 26 May 2020 19:05:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590519940; bh=gkOodJPnHPt2bn5Ii9IrOlStnEZJDKD9xkLvRS4kHSQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v8lnzqQel1Q/+KR2D0czq2NPxE0lTz/t1dClrK+cK94hGLXDNC2Imj71YtQ8Meu2/ hZ4nDpOyHgX8gia06ssSsDHcOVhirLzhQvYCG92Q24B31XtL6NQJrEXy67sHJSqXuk F+RcI26UDFNXlIofENiGq7CjguzZzODOuEeCHHxc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peter Ujfalusi , Olivier Moysan , Fabrice Gasnier , Jonathan Cameron , Sasha Levin Subject: [PATCH 4.19 77/81] iio: adc: stm32-dfsdm: Use dma_request_chan() instead dma_request_slave_channel() Date: Tue, 26 May 2020 20:53:52 +0200 Message-Id: <20200526183935.612357218@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200526183923.108515292@linuxfoundation.org> References: <20200526183923.108515292@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peter Ujfalusi [ Upstream commit a9ab624edd9186fbad734cfe5d606a6da3ca34db ] dma_request_slave_channel() is a wrapper on top of dma_request_chan() eating up the error code. By using dma_request_chan() directly the driver can support deferred probing against DMA. Signed-off-by: Peter Ujfalusi Acked-by: Olivier Moysan Acked-by: Fabrice Gasnier Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/adc/stm32-dfsdm-adc.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c index f5586dd6414d..516d7d22d9f4 100644 --- a/drivers/iio/adc/stm32-dfsdm-adc.c +++ b/drivers/iio/adc/stm32-dfsdm-adc.c @@ -933,9 +933,13 @@ static int stm32_dfsdm_dma_request(struct iio_dev *indio_dev) }; int ret; - adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx"); - if (!adc->dma_chan) - return -EINVAL; + adc->dma_chan = dma_request_chan(&indio_dev->dev, "rx"); + if (IS_ERR(adc->dma_chan)) { + int ret = PTR_ERR(adc->dma_chan); + + adc->dma_chan = NULL; + return ret; + } adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev, DFSDM_DMA_BUFFER_SIZE,