From nobody Tue Dec 16 15:45:11 2025 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 E66CB269B02; Mon, 5 May 2025 18:49:43 +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=1746470986; cv=none; b=XgmP0euhSCZ1V/23lf6f1Iax7twsldZraC/GVvCfbxh/ajVr8MCBDsXVbTk8HADYacxFlvmAmEcOlg0gEp3IkrzYu2bemPmzTVS11uZGKtNMzn5ZD+93fiPioNaBNSrra3Xkg5tJJgX9tXu8bCM1G+29rwQ0OYOqrUHvoLhrJ0w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746470986; c=relaxed/simple; bh=R8M59vxHAjUlkD4wexaKntih0q/NCGKUE+K4wXaJ7YA=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=AMUkZcUP/bZ62JdiLUOXqK2hXqKGy32UR+O48gHhR+7G19bGuXxxOz7HzmUIv5fn74Ln+RfTGIuvFDHESK0rlyUzTd9Q9YE0ax6wYBXMk2xpNmXpHNlaCs/NFmUb8JsmDaXJXrETUXQrNGSZACrB2Lzxg0okEIOnl1MObFmLRYQ= 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=e8cXzcSy; 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="e8cXzcSy" Received: from proxmox-mailgw.intranet.prolan.hu (localhost.localdomain [127.0.0.1]) by proxmox-mailgw.intranet.prolan.hu (Proxmox) with ESMTP id 73B05A09FF; Mon, 5 May 2025 20:49:40 +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=Ev/Q0RIsmgy1mBqoL4mI cg60ZAPn1CqjIwINVPt8wj8=; b=e8cXzcSyQPxXYdsu/U42CdYPKRUSg0Z0SQ1z Y3SasSSCXe5iGzcK1CoS5lrAyoqikJpJi9PjpfMRaDgnsmCME0dwDDNx+KuQ9L6F 7XNNhlN8znhvOADpwDfzWtBWjAEGXL2SyZ8hrKJ3DXgwPWKsb6icoFLB5GfXP0cb MoBjdjue4nQ+oWPayhOWopS+05UHMhCnBnpG5oH4Hzh6suAcyNYt7Ld2x/UCyQB0 2VdmOiAOUf8+/VXNtmF9uuapIdO15TYg95PZTcaSiAGnDg6svQLEdW/VS6nsuYdN feukDGtGCe7ghrlOefnAdsy6fC0/26+GUua34Su7IP19JtejdWik81D5XzKoSpNY JJ3C7V4LCvTe9rSn4sZQlIZz7OSH1fzeKf9YtiotGTa5fvdf9CgVytJv6bjZY1Ls pbm4U0nuMxNycvNkXIt/X4PHwiJDGG+VZXANtY+zEan+P5cCRHCHXv5OyuBpOnI/ mNtb2Oziv72ETHwECJcO/6ybG2J8JcQZ0kEB1o1Qw9tDEaLTpmt7NyGxxHKUWvQR 93OqPDPkIFmTMiDbHKbfXoZLO/7G95N3B3/bTVD8e7qcrKJYEyZtZ8tI3Pld8vph z5qxcNOgPF/ALp5nOgCoYhqzuhnn0GL7vKh27cKgW6pmUFmfDdPp5o34P/IL/lX0 njMOkMI= 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 v5 1/2] dma: Add devm_dma_request_chan() Date: Mon, 5 May 2025 20:49:33 +0200 Message-ID: <20250505184936.312274-2-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250505184936.312274-1-csokas.bence@prolan.hu> References: <20250505184936.312274-1-csokas.bence@prolan.hu> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ESET-AS: R=OK;S=0;OP=CALC;TIME=1746470979;VERSION=7990;MC=2492889595;ID=217952;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A2980D94853667166 Expand the arsenal of devm functions for DMA devices, this time for requesting channels. Signed-off-by: Bence Cs=C3=B3k=C3=A1s --- 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); =20 +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 point= er. + * + * The operation is managed and will be undone on driver detach. + */ + +struct dma_chan *devm_dma_request_chan(struct device *dev, const char *nam= e) +{ + struct dma_chan *chan =3D dma_request_chan(dev, name); + int ret =3D 0; + + if (!IS_ERR(chan)) + ret =3D 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, =20 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 *nam= e); =20 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_m= ask( { return ERR_PTR(-ENODEV); } + +static inline struct dma_chan *devm_dma_request_chan(struct device *dev, c= onst char *name) +{ + return ERR_PTR(-ENODEV); +} + static inline void dma_release_channel(struct dma_chan *chan) { } --=20 2.49.0