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From:   Wolfram Sang <wsa+renesas@sang-engineering.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-renesas-soc@vger.kernel.org,
        Wolfram Sang <wsa+renesas@sang-engineering.com>,
        linux-ide@vger.kernel.org
Subject: [PATCH 0/1] ata: simplify getting .driver_data
Date:   Sun, 21 Oct 2018 21:59:48 +0200
Message-Id: <20181021195949.1351-1-wsa+renesas@sang-engineering.com>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

I got tired of fixing this in Renesas drivers manually, so I took the big
hammer. Remove this cumbersome code pattern which got copy-pasted too much
already:

-	struct platform_device *pdev = to_platform_device(dev);
-	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
+	struct ep93xx_keypad *keypad = dev_get_drvdata(dev);

A branch, tested by buildbot, can be found here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git coccinelle/get_drvdata

I have been asked if it couldn't be done for dev_set_drvdata as well. I checked
it and did not find one occasion where it could be simplified like this. Not
much of a surprise because driver_data is usually set in probe() functions
which access struct platform_device in many other ways.

I am open for other comments, suggestions, too, of course.

Here is the cocci-script I created:

@@
struct device* d;
identifier pdev;
expression *ptr;
@@
(
-	struct platform_device *pdev = to_platform_device(d);
|
-	struct platform_device *pdev;
	...
-	pdev = to_platform_device(d);
)
	<... when != pdev
-	&pdev->dev
+	d
	...>

	ptr =
-	platform_get_drvdata(pdev)
+	dev_get_drvdata(d)

	<... when != pdev
-	&pdev->dev
+	d
	...>

Kind regards,

   Wolfram


Wolfram Sang (1):
  ata: pata_samsung_cf: simplify getting .driver_data

 drivers/ata/pata_samsung_cf.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

-- 
2.19.0