linux-kernel - [PATCH v2] uio: pruss: use devm_clk

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Message-ID: <20201119145059.48326-1-alexandru.ardelean@analog.com>
Date:   Thu, 19 Nov 2020 16:50:59 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v2] uio: pruss: use devm_clk_get() for clk init

This change uses devm_clk_get() to obtain a reference to the clock. It has
the benefit that clk_put() is no longer required, and cleans up the exit &
error path.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---

Changelog v1 -> v2:
* reverted silly/goofed `return ret` to `return PTR_ERR(gdev->pruss_clk);`
  this caused a warning about `ret` being uninitialized

 drivers/uio/uio_pruss.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/uio/uio_pruss.c b/drivers/uio/uio_pruss.c
index 41470c4dba02..e9096f53b4cc 100644
--- a/drivers/uio/uio_pruss.c
+++ b/drivers/uio/uio_pruss.c
@@ -110,7 +110,6 @@ static void pruss_cleanup(struct device *dev, struct uio_pruss_dev *gdev)
 			      gdev->sram_vaddr,
 			      sram_pool_sz);
 	clk_disable(gdev->pruss_clk);
-	clk_put(gdev->pruss_clk);
 }
 
 static int pruss_probe(struct platform_device *pdev)
@@ -131,7 +130,7 @@ static int pruss_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	/* Power on PRU in case its not done as part of boot-loader */
-	gdev->pruss_clk = clk_get(dev, "pruss");
+	gdev->pruss_clk = devm_clk_get(dev, "pruss");
 	if (IS_ERR(gdev->pruss_clk)) {
 		dev_err(dev, "Failed to get clock\n");
 		return PTR_ERR(gdev->pruss_clk);
@@ -140,7 +139,7 @@ static int pruss_probe(struct platform_device *pdev)
 	ret = clk_enable(gdev->pruss_clk);
 	if (ret) {
 		dev_err(dev, "Failed to enable clock\n");
-		goto err_clk_put;
+		return ret;
 	}
 
 	regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -229,8 +228,6 @@ static int pruss_probe(struct platform_device *pdev)
 		gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz);
 err_clk_disable:
 	clk_disable(gdev->pruss_clk);
-err_clk_put:
-	clk_put(gdev->pruss_clk);
 
 	return ret;
 }
-- 
2.17.1