From patchwork Fri Feb 7 12:47:56 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: 13964941 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 6354E1DED70; Fri, 7 Feb 2025 12:48:08 +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=1738932490; cv=none; b=sLGQ4u2qbDc0t7vtQanqGUqlJaCvthGwLUpPg6QQYi1hPpoMclKd82xXtOgEdWcHF8DhdoXBXllWeQIJyNeQ8/0rB5X8YTgtrE8VrHMRXNgcljy3tjS4rjbEqxZJKPThKnpD8+tz7YjQAXLeReGyQSysJTZ5VClxE/+wG4tV4s0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738932490; c=relaxed/simple; bh=x39wM5IEXku0agPTtfPWYboyk7mBbtqeLmPY+Swh07A=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Rk1c443lQoiop6oNmGAG+L+z7IsOTjBVVXThni+uqB0YCW6hm1RoeFLGkEcrJGhU+mcvIexhWtyR76IoNjRRNMKjPetJjLEDYbIAsWfEUi0ybbmcW+J2pyVMxtXbXT1a4MgdVypdMeGuBy0T1MlWk5h3NpBuNyXKoH95tUkO77k= 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=Cj49GtWn; 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="Cj49GtWn" Received: from proxmox-mailgw.intranet.prolan.hu (localhost.localdomain [127.0.0.1]) by proxmox-mailgw.intranet.prolan.hu (Proxmox) with ESMTP id B1951A09FC; Fri, 7 Feb 2025 13:48:06 +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=/dPRX9W95wzwQTmmvdwr EPqh/JERYDW6ukU8wyxlrOs=; b=Cj49GtWnNikMKrlhBy9CrWtuFG7ToGN7lYLN roKdArvClJN/66DZiL8F8W8Qid4j3VOuOCNz5izilCAtQb+TmVCfnIoY5n5y1fQ8 kHrm2+lFA4GX9fAOaV7r7LzZFaQu6o4hqThrXbnsNXrnOOA2qV8gxCVMlY+UnKLc PKFiaLMoiCHvzOcturt6qeJceXeJz0R/gNjipw8r7vj9rsm/TQVFEISewEjoJDcL cIjPr8jM6rSQPxuFFVYx5MktzOjjtybPGsf22pmBFL8Xd5bNkzlJ+EMqDGoY9A9y frYVt6CY1o1VGkjtG5tqP6qFyd6iTwP/rrNypraXurwOu1Ox0qJue0WRYkVioFNa e/dxfx4JrKvMzq5LQtPi98uVaiovjrsjykE52IJ8GhOspvm92SIeNv+4sqN7Ds+3 WNPVMVOyqE6whXTL9O9L5QMkegz30J+J/ajxEEE2BvUMQdKCX8PVhO2+eR1SvNNo GsEfm8oAb1CM+pC5Sva3oB2VfDYZNN9v6GQ/EPJj30DORQ54ZlZ9xMhlfMSz1ZJo z+GJQFtAojXh4I9e0sJ5eeIYoZKXLaAaFKaXjVrgIBT6jrOW26zazPWdmWzdCk5u wA2UCKOypjeMjDhu9sRxPOBy2KfOot2qAyFYZ/7OnMiRgyvqMSIujLzJHf+gWmJK Ef7fnPQ= From: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= To: , CC: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= , Vinod Koul Subject: [PATCH for-6.14 v3 1/4] dma: Add devm_dma_request_chan() Date: Fri, 7 Feb 2025 13:47:56 +0100 Message-ID: <20250207124802.165408-2-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250207124802.165408-1-csokas.bence@prolan.hu> References: <20250207124802.165408-1-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=1738932486;VERSION=7985;MC=2997032330;ID=401533;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A29ACD94852617560 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) { }