[PATCH 0/1] net: dsa: simplify getting .driver_data

[PATCH 0/1] net: dsa: simplify getting .driver_data

[Wolfram Sang]

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):
  net: dsa: legacy: simplify getting .driver_data

 net/dsa/legacy.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

-- 
2.19.0

[PATCH 1/1] net: dsa: legacy: simplify getting .driver_data

[Wolfram Sang]

We should get 'driver_data' from 'struct device' directly. Going via
platform_device is an unneeded step back and forth.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---

Build tested only. buildbot is happy.

 net/dsa/legacy.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index 8aa92b09db76..cb42939db776 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -686,8 +686,7 @@ static void dsa_shutdown(struct platform_device *pdev)
 #ifdef CONFIG_PM_SLEEP
 static int dsa_suspend(struct device *d)
 {
-	struct platform_device *pdev = to_platform_device(d);
-	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	struct dsa_switch_tree *dst = dev_get_drvdata(d);
 	int i, ret = 0;
 
 	for (i = 0; i < dst->pd->nr_chips; i++) {
@@ -702,8 +701,7 @@ static int dsa_suspend(struct device *d)
 
 static int dsa_resume(struct device *d)
 {
-	struct platform_device *pdev = to_platform_device(d);
-	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	struct dsa_switch_tree *dst = dev_get_drvdata(d);
 	int i, ret = 0;
 
 	for (i = 0; i < dst->pd->nr_chips; i++) {
-- 
2.19.0

Re: [PATCH 1/1] net: dsa: legacy: simplify getting .driver_data

[Andrew Lunn]

On Sun, Oct 21, 2018 at 10:01:05PM +0200, Wolfram Sang wrote:
> We should get 'driver_data' from 'struct device' directly. Going via
> platform_device is an unneeded step back and forth.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH 1/1] net: dsa: legacy: simplify getting .driver_data

[Florian Fainelli]

On 10/21/18 1:01 PM, Wolfram Sang wrote:
> We should get 'driver_data' from 'struct device' directly. Going via
> platform_device is an unneeded step back and forth.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian