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Sun, 19 Jul 2026 18:50:16 -0700 (PDT) From: Rosen Penev To: linux-ide@vger.kernel.org Cc: Damien Le Moal , Niklas Cassel , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , linux-kernel@vger.kernel.org (open list), llvm@lists.linux.dev (open list:CLANG/LLVM BUILD SUPPORT:Keyword:\b(?i:clang|llvm)\b) Subject: [PATCH] ata: pata_pxa: use devres for DMA channel management Date: Sun, 19 Jul 2026 18:50:14 -0700 Message-ID: <20260720015014.1912040-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Convert the DMA channel request to devm_dma_request_chan() so the channel is released automatically on device teardown. This removes the explicit dma_release_channel() calls in the probe error paths and in pxa_ata_remove(), simplifying the driver. Devres releases in LIFO order, so the managed host detach registered by ata_host_activate() runs before the DMA channel is released, which preserves the previous teardown ordering. Built as a module for arm/pxa_defconfig (CONFIG_PATA_PXA=m) with LLVM=1 W=1; no new warnings. Assisted-by: opencode:hy3-free Signed-off-by: Rosen Penev --- drivers/ata/pata_pxa.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c index c816997dc0a9..a08b852dd9f9 100644 --- a/drivers/ata/pata_pxa.c +++ b/drivers/ata/pata_pxa.c @@ -262,33 +262,26 @@ static int pxa_ata_probe(struct platform_device *pdev) /* * Request the DMA channel */ - data->dma_chan = dma_request_chan(&pdev->dev, "data"); + data->dma_chan = devm_dma_request_chan(&pdev->dev, "data"); if (IS_ERR(data->dma_chan)) return PTR_ERR(data->dma_chan); + ret = dmaengine_slave_config(data->dma_chan, &config); if (ret < 0) { dev_err(&pdev->dev, "dma configuration failed: %d\n", ret); - dma_release_channel(data->dma_chan); return ret; } /* * Activate the ATA host */ - ret = ata_host_activate(host, irq, ata_sff_interrupt, + return ata_host_activate(host, irq, ata_sff_interrupt, pdata->irq_flags, &pxa_ata_sht); - if (ret) - dma_release_channel(data->dma_chan); - - return ret; } static void pxa_ata_remove(struct platform_device *pdev) { struct ata_host *host = platform_get_drvdata(pdev); - struct pata_pxa_data *data = host->ports[0]->private_data; - - dma_release_channel(data->dma_chan); ata_host_detach(host); } -- 2.55.0