linux-kernel - [PATCH 0/6] gpio: simplify getting .driver

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Message-Id: <20181021200002.1472-1-wsa+renesas@sang-engineering.com>
Date:   Sun, 21 Oct 2018 21:59:55 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: [PATCH 0/6] gpio: simplify getting .driver_data

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 (6):
  gpio: gpio-dwapb: simplify getting .driver_data
  gpio: gpio-lynxpoint: simplify getting .driver_data
  gpio: gpio-mxc: simplify getting .driver_data
  gpio: gpio-omap: simplify getting .driver_data
  gpio: gpio-tegra: simplify getting .driver_data
  gpio: gpio-zynq: simplify getting .driver_data

 drivers/gpio/gpio-dwapb.c     |  6 ++----
 drivers/gpio/gpio-lynxpoint.c |  3 +--
 drivers/gpio/gpio-mxc.c       |  6 ++----
 drivers/gpio/gpio-omap.c      | 12 ++++--------
 drivers/gpio/gpio-tegra.c     |  6 ++----
 drivers/gpio/gpio-zynq.c      |  6 ++----
 6 files changed, 13 insertions(+), 26 deletions(-)

-- 
2.19.0