From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 03F9E530DEC for ; Wed, 9 Sep 2026 10:45:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788950725; cv=none; b=C60mrNyWaXkTwNGIaeIJKrzzZfuVzR5FcidArm4a49ISL4apjSQo4/oJTaHs+sWL/EhW0ADtazSKNMnpRrMhj04SGo4kqI5wNxPt+R+4VDhvrdnBUuT79SHL6BLPhXH7SCjV28YPetg0PoCEpDdbsOfLVqthIJ4uF9kuHtVwkpk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788950725; c=relaxed/simple; bh=wpscjhLHShuwilUgf5sf+EJsZDPfuVat+Cx+eMm5A+k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=RZg7cMKaLPxRdWu69B03HNzYaPslHVcql5XAELEwjEcXzbdhVLqSxwE2F+bc5g2Dxmj1/Aak1M6rMtGkqQN0p7r8D6oMtiqhiXsjkTZ0pTkjenfATe0jFRbME6i+B36pZLknHnlasmJser4VXbXLbaLmbQd39kXrr7goUGeg7S8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IANHaZjn; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IANHaZjn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 51C121F00A3D; Wed, 9 Sep 2026 10:45:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788950722; bh=lmCA/LwkBP52y2wIsxzkF6RN0Wlb4enyMufQDTETJ4I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=IANHaZjnNqMgdrloai+kE5bqc04UytXxdHM4w1P6uVwZOix5BXJC1gaD2DOazSTp8 bD4z8S1R38SLiiPj8L/AItkgG+bm2GtJLk1BjfRUjcUf2xY34Em72am9PfyQMX1QAw YJfWaBOC5UfB7MYkPSr7+BIdEIqKNVfIELo5NZbejU/ISKJqm0Cf5y+KDk9FuGR8Re uNI4mXh+mLN8AShVCgXpRn/oeXvBW1tDTCasatRdsYuMY5s2WvPx0Qu0EcSZljXcOR 6KnThmlJmW1ywMHsZr0U062U95dQn3cEjL0GrZf0Yqk5+PEj3ETNxcaKktDCMC8f68 90Iw4UQE/4nJQ== From: Sasha Levin To: stable@vger.kernel.org Cc: =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= , Vinod Koul , Sasha Levin Subject: [PATCH 6.6.y 1/2] dmaengine: Add devm_dma_request_chan() Date: Wed, 9 Sep 2026 06:45:19 -0400 Message-ID: <20260909104520.1561085-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090301-luncheon-compactly-c5cc@gregkh> References: <2026090301-luncheon-compactly-c5cc@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 b1c9187602d53..8f221a407fc04 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -927,6 +927,36 @@ 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 cff3dba658209..ea476ea79f767 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -1490,6 +1490,7 @@ 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); @@ -1526,6 +1527,12 @@ 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