linux-kernel - [PATCH 1/2] dmaengine: sprd: delete enable opreation in probe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231102121623.31924-1-kaiwei.liu@unisoc.com>
Date:   Thu, 2 Nov 2023 20:16:23 +0800
From:   Kaiwei Liu <kaiwei.liu@...soc.com>
To:     Vinod Koul <vkoul@...nel.org>, Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        kaiwei liu <liukaiwei086@...il.com>,
        Wenming Wu <wenming.wu@...soc.com>
Subject: [PATCH 1/2] dmaengine: sprd: delete enable opreation in probe

From: "kaiwei.liu" <kaiwei.liu@...soc.com>

In the probe of dma, it will allocate device memory and do some
initalization settings. All operations are only at the software
level and don't need the DMA hardware power on. It doesn't need
to resume the device and set the device active as well. here
delete unnecessary operation.

Signed-off-by: kaiwei.liu <kaiwei.liu@...soc.com>
---
 drivers/dma/sprd-dma.c | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 08fcf1ec368c..8ab5a9082fc5 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -1203,21 +1203,11 @@ static int sprd_dma_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, sdev);
-	ret = sprd_dma_enable(sdev);
-	if (ret)
-		return ret;
-
-	pm_runtime_set_active(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
-
-	ret = pm_runtime_get_sync(&pdev->dev);
-	if (ret < 0)
-		goto err_rpm;
 
 	ret = dma_async_device_register(&sdev->dma_dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
-		goto err_register;
+		return ret;
 	}
 
 	sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
@@ -1226,16 +1216,11 @@ static int sprd_dma_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_of_register;
 
-	pm_runtime_put(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
 	return 0;
 
 err_of_register:
 	dma_async_device_unregister(&sdev->dma_dev);
-err_register:
-	pm_runtime_put_noidle(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
-err_rpm:
-	sprd_dma_disable(sdev);
 	return ret;
 }
 
-- 
2.17.1