From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793210547; b=EwEp8jyGxezSJZY18PRKYCMuwGGx5A2iGyJjRtDBx9hZohEu2KiqwNfSvsvLmNf59xRu HtJ6di9/+V8YaVxFQOliUywLQQLS8VCAmAIez/viNoB7xVJS2ef07qnppw2z/h2f4i9ts Jf53NA0vRPeV/ysdQaV4J+3U4atRxF05Pd2buP/HSMSlJmeBUuFoa383M0nA1cet56oUF eGOM+jwcc2LaxUcP+1LV59G2bV8/LmzM7vZZtxf3YHfoForabK0QWte//jS3TAhn038n+ OvOfOzb2mV6Z9aVD1m6ggieFJMlc+QNkG3cpS/6q4tmCP1hd6KPNK9YNUshGfeBQj5Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793210547; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=0862+1uuXoBl9cPbTlP9LewAJauUHSlUXJJy7/vpmEc=; b=NauhVzWyY29xNwi8d3RLRRmxb1TYs7KRaFEo7EQld11pcQxPuMtSWvwNIcRc1b1E3XgA Ieny5muRzoc6utQNPHgbI7K64jHmmc2xaNz+lo0qx12o0OWu6HzwyvGe0wfZ86wfFSGBc +IW1cYVwQKydGtwDp33Cg+0s5+nVG7gGpLkPdUfzs2/k2urPPHzHeAzphq2uCHrbfTmsU 774DhRGBk97ghmMwJwzT0lXGXO76LcCVQ/YGNC4PvYti9Nackyd9oaI+EH0q/fXVPhIbi evFWN9dYX3jctwqqSlTHst2JeYoxEvZwbPhghFaO/xGnaFY/rGvrXwbdNZ9aiftvb0w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b="s/TS+9Vm"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A2F5A606A31A; Wed, 28 Oct 2026 18:02:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=s/TS+9Vm Received: by smtp.kernel.org (Postfix) with ESMTPSA id F11C41F01825; Wed, 28 Oct 2026 18:02:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793210546; bh=0862+1uuXoBl9cPbTlP9LewAJauUHSlUXJJy7/vpmEc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=s/TS+9VmC0LXii+biMMtstRLknmpzqeRAgAOj5rD0CdgveTLC436urpCedAfxE9n7 IHls11roflX8+sUQjavA47gTb29BDpJWZQlCZQrs53LySnRFzDdCbsxHETZTm7hEvA 010tHkq28Zbn2s4ML8xLzI4EmJTtiAkwAyLFyE/I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= , Vinod Koul , Sasha Levin Subject: [PATCH 5.15 063/571] dmaengine: Add devm_dma_request_chan() Date: Wed, 28 Oct 2026 17:53:30 +0100 Message-ID: <20261028170009.521977419@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170008.009143722@linuxfoundation.org> References: <20261028170008.009143722@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bence Csókás [ Upstream commit 08bf1663c21a3e815eda28fa242d84c945ca3b94 ] Expand the arsenal of devm functions for DMA devices, this time for requesting channels. Signed-off-by: Bence Csókás Link: https://lore.kernel.org/r/20250610082256.400492-2-csokas.bence@prolan.hu Signed-off-by: Vinod Koul Stable-dep-of: 777979e62711 ("i2c: mxs: fix DMA channel leak on probe error") Signed-off-by: Sasha Levin --- 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 41a677a82ed41..fe148431ad9cf 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -934,6 +934,36 @@ 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 04826a7930392..e4f4838f3b7b6 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -1486,6 +1486,7 @@ 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); @@ -1522,6 +1523,12 @@ 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) { } -- 2.53.0