Thread (11 messages) 11 messages, 2 authors, 2019-07-16

Re: [PATCH 3/5] Input: s3c2410_ts: Use devm_platform_ioremap_resource()

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2019-07-16 15:52:59
Also in: linux-input, lkml

Hi Mukesh,

On Thu, Apr 04, 2019 at 12:47:21PM +0530, Mukesh Ojha wrote:
quoted hunk ↗ jump to hunk
devm_platform_ioremap_resource() internally have platform_get_resource()
and devm_ioremap_resource() in it. So instead of calling them separately
use devm_platform_ioremap_resource() directly.

Signed-off-by: Mukesh Ojha <redacted>
---
 drivers/input/touchscreen/s3c2410_ts.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)
diff --git a/drivers/input/touchscreen/s3c2410_ts.c b/drivers/input/touchscreen/s3c2410_ts.c
index 1173890..e11cdae 100644
--- a/drivers/input/touchscreen/s3c2410_ts.c
+++ b/drivers/input/touchscreen/s3c2410_ts.c
@@ -242,7 +242,6 @@ static int s3c2410ts_probe(struct platform_device *pdev)
 	struct s3c2410_ts_mach_info *info;
 	struct device *dev = &pdev->dev;
 	struct input_dev *input_dev;
-	struct resource *res;
 	int ret = -EINVAL;
 
 	/* Initialise input stuff */
@@ -277,14 +276,7 @@ static int s3c2410ts_probe(struct platform_device *pdev)
 		goto err_clk;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "no resource for registers\n");
-		ret = -ENOENT;
-		goto err_clk;
-	}
-
-	ts.io = ioremap(res->start, resource_size(res));
+	ts.io = devm_platform_ioremap_resource(pdev, 0);
This is not an equivalent transformation: the original code (rightly or
wrongly) did not request the memory regions described by 'res' while new
variant does.

Also you can't simply slap a single devm resource in a driver that does
not use managed resources as it messes up the release order.

-- 
Dmitry

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