Re: [PATCH 35/58] move omap_wdt's probe function to .devinit.text

Wim Van Sebroeck
2009-03-29T18:09:27Z

Hi Uwe,

> A pointer to omap_wdt_probe is passed to the core via
> platform_driver_register and so the function must not disappear when the
> .init sections are discarded. Otherwise (if also having HOTPLUG=y)
> unbinding and binding a device to the driver via sysfs will result in an
> oops as does a device being registered late.
>
> An alternative to this patch is using platform_driver_probe instead of
> platform_driver_register plus removing the pointer to the probe function
> from the struct platform_driver.

Agree with the explanation, but ...

> diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
> index 2f2ce74..c9c14dd 100644
> --- a/drivers/watchdog/omap_wdt.c
> +++ b/drivers/watchdog/omap_wdt.c
> @@ -269,7 +269,7 @@ static const struct file_operations omap_wdt_fops = {
> .release = omap_wdt_release,
> };
>
> -static int __init omap_wdt_probe(struct platform_device *pdev)
> +static int __devinit omap_wdt_probe(struct platform_device *pdev)
> {
> struct resource *res, *mem;
> struct omap_wdt_dev *wdev;

...imho this would be the correct fix:

diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index aa5ad6e..f271385 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -258,7 +258,7 @@ static const struct file_operations omap_wdt_fops = {
.release = omap_wdt_release,
};

-static int __init omap_wdt_probe(struct platform_device *pdev)
+static int __devinit omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
struct omap_wdt_dev *wdev;
@@ -367,7 +367,7 @@ static void omap_wdt_shutdown(struct platform_device *pdev)
omap_wdt_disable(wdev);
}

-static int omap_wdt_remove(struct platform_device *pdev)
+static int __devexit omap_wdt_remove(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -426,7 +426,7 @@ static int omap_wdt_resume(struct platform_device *pdev)

static struct platform_driver omap_wdt_driver = {
.probe = omap_wdt_probe,
- .remove = omap_wdt_remove,
+ .remove = __devexit_p(omap_wdt_remove),
.shutdown = omap_wdt_shutdown,
.suspend = omap_wdt_suspend,
.resume = omap_wdt_resume,

Kind regards,
Wim.