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watchdog: mpcore_wdt: Use devm routines

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mpcore_wdt driver currently uses normal kzalloc, request_irq, ioremap, etc
routines. This patch replaces these routines with devm_kzalloc and
devm_request_mem_region etc, so that we don't need to handle freeing of
resources for error cases and module removal routine.

Also, request_irq is moved before registering misc device, so that we are ready
for irq as soon as device is registered.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Viresh Kumar 2012-03-12 09:51:59 +05:30 committed by Wim Van Sebroeck
parent aa065770f5
commit 75f5a536c0
1 changed files with 19 additions and 39 deletions
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58
drivers/watchdog/mpcore_wdt.c
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@ -338,43 +338,37 @@ static int __devinit mpcore_wdt_probe(struct platform_device *pdev)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENODEV;
goto err_out;
}
if (!res)
return -ENODEV;
wdt = kzalloc(sizeof(struct mpcore_wdt), GFP_KERNEL);
if (!wdt) {
ret = -ENOMEM;
goto err_out;
}
wdt = devm_kzalloc(&pdev->dev, sizeof(struct mpcore_wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
wdt->dev = &pdev->dev;
wdt->irq = platform_get_irq(pdev, 0);
if (wdt->irq < 0) {
ret = -ENXIO;
goto err_free;
}
wdt->base = ioremap(res->start, resource_size(res));
if (!wdt->base) {
ret = -ENOMEM;
goto err_free;
if (wdt->irq < 0)
return -ENXIO;
ret = devm_request_irq(wdt->dev, wdt->irq, mpcore_wdt_fire, 0,
"mpcore_wdt", wdt);
if (ret) {
dev_printk(KERN_ERR, wdt->dev,
"cannot register IRQ%d for watchdog\n", wdt->irq);
return ret;
}
wdt->base = devm_ioremap(wdt->dev, res->start, resource_size(res));
if (!wdt->base)
return -ENOMEM;
mpcore_wdt_miscdev.parent = &pdev->dev;
ret = misc_register(&mpcore_wdt_miscdev);
if (ret) {
dev_printk(KERN_ERR, wdt->dev,
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto err_misc;
}
ret = request_irq(wdt->irq, mpcore_wdt_fire, 0, "mpcore_wdt", wdt);
if (ret) {
dev_printk(KERN_ERR, wdt->dev,
"cannot register IRQ%d for watchdog\n", wdt->irq);
goto err_irq;
return ret;
}
mpcore_wdt_stop(wdt);
@ -382,30 +376,16 @@ static int __devinit mpcore_wdt_probe(struct platform_device *pdev)
mpcore_wdt_pdev = pdev;
return 0;
err_irq:
misc_deregister(&mpcore_wdt_miscdev);
err_misc:
iounmap(wdt->base);
err_free:
kfree(wdt);
err_out:
return ret;
}
static int __devexit mpcore_wdt_remove(struct platform_device *pdev)
{
struct mpcore_wdt *wdt = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
misc_deregister(&mpcore_wdt_miscdev);
mpcore_wdt_pdev = NULL;
free_irq(wdt->irq, wdt);
iounmap(wdt->base);
kfree(wdt);
return 0;
}