From patchwork Mon Mar 17 13:53:37 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q3PDs2vDoXMgQmVuY2U=?= X-Patchwork-Id: 14019297 Received: from fw2.prolan.hu (fw2.prolan.hu [193.68.50.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E178523ED62; Mon, 17 Mar 2025 13:53:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.68.50.107 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742219636; cv=none; b=hQpJB/pgDVReiFsV+QOSaFBP8GeLbGAvfKPkAKcYHgQ9XcI4XdtuVCDlnEqiWj2t3NND3US9d0MOPqT98g3rvQHCxd8Oy6EhDPP0xkMJz4oYnQRQ+97jW8A60Y/g56Cj8TF13JMwQJA82GiwO0F3oLnRWegEnYKxWvXqck6Axcs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742219636; c=relaxed/simple; bh=8o2FV10LXPS4y7YD+bAR/nC38xtiWW6pVIGBKd15Qgc=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Ffe1obXIkzq1YkqHzkg3UfzU34pqFB3CY0HdHUcSTTQYbiy/WC+MLpMeK6XCX9fe1qAcjqY/3v8abhYWX8tkOP0zLYt4zKW0ce78McLZVQKzskROdmNPRxU4GSYXSvpUqP1SHeYZxWyvmdpnN4eiFRyio/L1SPUQQ3H9wY/+0LE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=prolan.hu; spf=pass smtp.mailfrom=prolan.hu; dkim=pass (4096-bit key) header.d=prolan.hu header.i=@prolan.hu header.b=FR70WLvu; arc=none smtp.client-ip=193.68.50.107 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=prolan.hu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=prolan.hu Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=prolan.hu header.i=@prolan.hu header.b="FR70WLvu" Received: from proxmox-mailgw.intranet.prolan.hu (localhost.localdomain [127.0.0.1]) by proxmox-mailgw.intranet.prolan.hu (Proxmox) with ESMTP id BEAA7A0467; Mon, 17 Mar 2025 14:53:51 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=prolan.hu; h=cc :cc:content-transfer-encoding:content-type:content-type:date :from:from:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=mail; bh=0o1CqcnBoa+erxXQ17CZ +o4z6tIXyZBWdDbU2LmsN1k=; b=FR70WLvufFS1XAW4FDl9sbvqGKaMAd556gTP HHK3QzFWZXQJmhHdrlN7wd6SfDae3q+/TyJXn324oJy+/nEC6WRLPXpHbQgDCu8j jkCsfKwSxSl5L+dA8G4UshCyxMdbjCBf2Hd5CIwI0N3yNF908QdK7sMkwdwVEBRh mBg/KQrJgyJxDKliq80tPPvsF6wLHqiQx6ccVbMIrim3DiKA5sBiVG08NcuY0WLv aEPPrPR5Xs+BL/M0B27hjFk5+lNtZbKe1NSfKTRthkbNzOKHzl434ot8Dk0a0O4I guxQciGRCFDCCrgDQfMQ8c7H7n+SNLkHKQ79OMvp9Wn2vjkipdzqE94zxYCO12HA 7Ort2EGIsRtlt0Jh+x1/qF9xyqt1ksAMJ8x1dyoujWAZ3SwDr8338DoPkx9WMoH1 53NJbgI4H+3+TSvBWzNfkGR0uhYU2Sw7vCiGBwQnueT7c/VHZB2jdLxePGSuMfGP qLog3rMy8YaEbKwu7Oq/9ScZiOu8qdno4EQQzk2Dkz1MGje9U0rHa+2YTWwbbYv8 DqCrfFJlhyjXztE4FV+XoaZ8EzPjPheS7fxHeq+nME+WEhfDT0FgiBjQRHlUrk4k 67pRzl1EhR4G09+XTfLjioaQSJ60TWQbtCIHJNkoLGHWFsgnyT6zBLh41q+ClHHb rV4YvZs= From: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= To: , CC: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= , Vinod Koul Subject: [PATCH v4 1/2] dma: Add devm_dma_request_chan() Date: Mon, 17 Mar 2025 14:53:37 +0100 Message-ID: <20250317135340.382532-2-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250317135340.382532-1-csokas.bence@prolan.hu> References: <20250317135340.382532-1-csokas.bence@prolan.hu> Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ESET-AS: R=OK;S=0;OP=CALC;TIME=1742219631;VERSION=7985;MC=2159532761;ID=155897;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A29ACD948526D7460 Expand the arsenal of devm functions for DMA devices, this time for requesting channels. Signed-off-by: Bence Csókás --- drivers/dma/dmaengine.c | 30 ++++++++++++++++++++++++++++++ include/linux/dmaengine.h | 7 +++++++ 2 files changed, 37 insertions(+) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index c1357d7f3dc6..02c29d26ac85 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -926,6 +926,36 @@ void dma_release_channel(struct dma_chan *chan) } EXPORT_SYMBOL_GPL(dma_release_channel); +static void dmaenginem_release_channel(void *chan) +{ + dma_release_channel(chan); +} + +/** + * devm_dma_request_chan - try to allocate an exclusive slave channel + * @dev: pointer to client device structure + * @name: slave channel name + * + * Returns pointer to appropriate DMA channel on success or an error pointer. + * + * The operation is managed and will be undone on driver detach. + */ + +struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name) +{ + struct dma_chan *chan = dma_request_chan(dev, name); + int ret = 0; + + if (!IS_ERR(chan)) + ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan); + + if (ret) + return ERR_PTR(ret); + + return chan; +} +EXPORT_SYMBOL_GPL(devm_dma_request_chan); + /** * dmaengine_get - register interest in dma_channels */ diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 346251bf1026..ffb54b52ef0c 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -1528,6 +1528,7 @@ struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask, struct dma_chan *dma_request_chan(struct device *dev, const char *name); struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask); +struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name); void dma_release_channel(struct dma_chan *chan); int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps); @@ -1564,6 +1565,12 @@ static inline struct dma_chan *dma_request_chan_by_mask( { return ERR_PTR(-ENODEV); } + +static inline struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name) +{ + return ERR_PTR(-ENODEV); +} + static inline void dma_release_channel(struct dma_chan *chan) { }