From mboxrd@z Thu Jan 1 00:00:00 1970 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 1371B280001; Tue, 10 Jun 2025 08:23:01 +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=1749543783; cv=none; b=irulSgZaHDkHYneKIydCdt9EyIKLnZqHMhxsMKi3OEEYqgqMWgkUaXzdrXP/CTeEs3TjTPhznOPro2z9jtlalRYUIzbjg0JbxrEC0+CC3vUKCfU3oq/tC9NegGH/KTmMswzOJZoLmO3tEA6U0cvF6dglSCzgXwEQD2QJ5J4xJNw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749543783; c=relaxed/simple; bh=RZYIPXpDN8oj5s1t15Isb+e1NRle6tqtT7usLRhl1MM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=oOLEhm51/6PY+kHhm35uzRlfmp3WOidCXG0o8x/A2DD31/iT9a9FRc1Z1jbgd8gAf7amgz14N7cQNY6Q4gBMwSTqZ9/Tyxv7uqUtF2aoBpRcSBQoNR4unNFprEB/2yKLuNCbk/APesX5d7ItJMpW37y58jbRZHMEKf5v7UuJa1Q= 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=KqYL8leP; 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="KqYL8leP" Received: from proxmox-mailgw.intranet.prolan.hu (localhost.localdomain [127.0.0.1]) by proxmox-mailgw.intranet.prolan.hu (Proxmox) with ESMTP id 13436A0403; Tue, 10 Jun 2025 10:23:00 +0200 (CEST) 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=Pdrk+9maRsee0qVYskeN GJ6hDw5zw0BT5yTDbtuUL8o=; b=KqYL8lePuGKIAp2vckOl5PFO/lSuKWly+jUp iMCbuVBeW6yv+fGXONBocsQUNm30RuM+pFwi2DXY+W6+UmcmltQUYsm4h2704ETe P4tcMzFjJExDKEMagaEaFgc9q3EBHuqfB0HYQF085t2XzKNpDjSWad0Ge3dUFxvd bVenmrx2KoPNoVmgt2TmdtOOA99W8jnDU3+TnvShl2V95MAQELlABhxa/j/kFxLu OOdNdGuTvtjWT3UTTB2/s+00clIMlevN/RXIL63/2Oh7jaJM88YrBMqVXgurvEal pxtUlQfyoN9Ex74plaJ4b3nrMM8jtKl6lH68esWnmH/WKONThLbNg8kmBupXuVve pweIGNUxAaRGhw3dV6qga3Q3dVteSHLykiMCSKvd3r6f6e8YE+dRSYoYirxB6GN0 +QPp2CUg+Yk0HtslvbKltcd0I+3FlebiiCQO+cI/lbRXKNqcG7+rPrUAM4fdapnK Olr54XX43t6Cor+D2EzO/tT7k1MCvh/qkFLwyG/W/wZKCoJwAW62X/j6bSt1Ow/9 WEAYi3x7YClOD1NTviSN4WbiYgok7KYEM3kzz+zI7bEfP/++3lM1b5oG7Cosi+pQ Lwm5XUXZF6cFSDPnM+aPHymVlQjXCrxs5zr6k9GJ3FtCt3FHBxmLFxRavMt1Dc27 SMcGUZ4= From: =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= To: , CC: =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= , Vinod Koul Subject: [PATCH v7 1/2] dma: Add devm_dma_request_chan() Date: Tue, 10 Jun 2025 10:22:53 +0200 Message-ID: <20250610082256.400492-2-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250610082256.400492-1-csokas.bence@prolan.hu> References: <20250610082256.400492-1-csokas.bence@prolan.hu> Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ESET-AS: R=OK;S=0;OP=CALC;TIME=1749543779;VERSION=7993;MC=4106326459;ID=452479;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A296767155D62776A 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 758fcd0546d8..ca13cd39330b 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 bb146c5ac3e4..6de7c05d6bd8 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -1524,6 +1524,7 @@ 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); @@ -1560,6 +1561,12 @@ 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) { } -- 2.43.0