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 AAC3837F8C6 for ; Wed, 9 Sep 2026 10:57:23 +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=1788951445; cv=none; b=X91MZEZ5OTPMhvE5DobC6RimukIOo22CS7F2pScBeAXnriDxB/H4Ah3zFy00Ea9eFOrqYQyGfzDPAZ+XszIzsNeptK/zKWNov6FeN1SUZecp8d+M/qUXTNL98ScWoG4CCbhc3Pyqc8UbQP6G9rAJNLiSjjbwGwheLgsHMZTdE9Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788951445; c=relaxed/simple; bh=JmpHa1XEGHXion+AfCJkbcsKAKfHx9mHhcUAt5dpDUU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=jWZ9ahglJcOrzRvNIopIssXTtFFih/TFKQ5u40MjpT1H4cmUH3LJ5k89CUwFdiuad9kD/9GPzHQl+UgM0Mg5YNJORNe65NvvsQrSLOQTXRkmtim2afoFPp7YAmF2x5Jrywisg6Fw89tT6CGgtOk3xo0nkSY+INWam921NtUzk+s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ik0efii+; 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="Ik0efii+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7DEF11F00AC4; Wed, 9 Sep 2026 10:57:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788951443; bh=3V6Xbc+aaQWWkqwTW1ipdVJJgGGGpYw+4nOaYsJ3Nug=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Ik0efii+rbhA5Znkek/KB2l+1mk5ZyR6I6jN1LGMSLxChNx8bF2F9xovHp3h3LSFY K2FZNPeEm9x6iaQ7Gqt5BPNAV79ampyu/3ACcZGxNG332XXzFf2MeDeeMENDkSropM yBdm/A2u+770aT+DAUA5PVGiD3xiluBlETO1/iucMNdy1VWf9vcpiuSms09orv4vtL 5yD2kyzGrho1Y7FAJYkXGZNNevjq8AjQGgQDcNlggao7iWgme7Ggj8cp9PuMnsofCj BkjCSwBZiZjDUv44b4fPl6gDLgUjxt5247XUlPs6SQxBDmAPPZQbADvQV+C8He+RgB ZmwkWeRsodrzA== From: Sasha Levin To: stable@vger.kernel.org Cc: =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= , Vinod Koul , Sasha Levin Subject: [PATCH 5.15.y 1/2] dmaengine: Add devm_dma_request_chan() Date: Wed, 9 Sep 2026 06:57:20 -0400 Message-ID: <20260909105721.1641676-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090302-showgirl-ongoing-e7b7@gregkh> References: <2026090302-showgirl-ongoing-e7b7@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 68078e83d5756..66b5db511601b 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -928,6 +928,36 @@ 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