2016-09-04 18:13:55

by PrasannaKumar Muralidharan

Subject: [PATCH v2] hwrng: pasemi_rng.c: Migrate to managed API

Use devm_ioremap and devm_hwrng_register instead of ioremap and
hwrng_register. This removes unregistering and error handling code.

Changes in v2:
Remove hardcoded resource size in ioremap, use resource struct obtained
by calling platform_get_resource.

Removing hardcoded resource size was suggested by LABBE Corentin.

CC: Darren Stevens <[email protected]>

Suggested-by: LABBE Corentin <[email protected]>
Signed-off-by: PrasannaKumar Muralidharan <[email protected]>
---
drivers/char/hw_random/pasemi-rng.c | 37 +++++++------------------------------
1 file changed, 7 insertions(+), 30 deletions(-)

diff --git a/drivers/char/hw_random/pasemi-rng.c b/drivers/char/hw_random/pasemi-rng.c
index 699b725..b4e32f7 100644
--- a/drivers/char/hw_random/pasemi-rng.c
+++ b/drivers/char/hw_random/pasemi-rng.c
@@ -95,42 +95,20 @@ static struct hwrng pasemi_rng = {
.data_read = pasemi_rng_data_read,
};

-static int rng_probe(struct platform_device *ofdev)
+static int rng_probe(struct platform_device *pdev)
{
void __iomem *rng_regs;
- struct device_node *rng_np = ofdev->dev.of_node;
- struct resource res;
- int err = 0;
+ struct resource *res;

- err = of_address_to_resource(rng_np, 0, &res);
- if (err)
- return -ENODEV;
-
- rng_regs = ioremap(res.start, 0x100);
-
- if (!rng_regs)
- return -ENOMEM;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ rng_regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(rng_regs))
+ return PTR_ERR(rng_regs);

pasemi_rng.priv = (unsigned long)rng_regs;

pr_info("Registering PA Semi RNG\n");
-
- err = hwrng_register(&pasemi_rng);
-
- if (err)
- iounmap(rng_regs);
-
- return err;
-}
-
-static int rng_remove(struct platform_device *dev)
-{
- void __iomem *rng_regs = (void __iomem *)pasemi_rng.priv;
-
- hwrng_unregister(&pasemi_rng);
- iounmap(rng_regs);
-
- return 0;
+ return devm_hwrng_register(&pdev->dev, &pasemi_rng);
}

static const struct of_device_id rng_match[] = {
@@ -146,7 +124,6 @@ static struct platform_driver rng_driver = {
.of_match_table = rng_match,
},
.probe = rng_probe,
- .remove = rng_remove,
};

module_platform_driver(rng_driver);
--
2.5.0

2016-09-07 13:22:10

by Herbert Xu

Subject: Re: [PATCH v2] hwrng: pasemi_rng.c: Migrate to managed API

On Sun, Sep 04, 2016 at 11:43:08PM +0530, PrasannaKumar Muralidharan wrote:
> Use devm_ioremap and devm_hwrng_register instead of ioremap and
> hwrng_register. This removes unregistering and error handling code.
>
> Changes in v2:
> Remove hardcoded resource size in ioremap, use resource struct obtained
> by calling platform_get_resource.
>
> Removing hardcoded resource size was suggested by LABBE Corentin.
>
> CC: Darren Stevens <[email protected]>
>
> Suggested-by: LABBE Corentin <[email protected]>
> Signed-off-by: PrasannaKumar Muralidharan <[email protected]>

Patch applied. Thanks.
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt