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rtc: mrst: switch to devm functions 

Switch to devm managed functions to simplify error handling and device
removal

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2018-06-05 16:18:17 +02:00
parent 29615d03cc
commit 32b41f93dc
1 changed files with 18 additions and 27 deletions
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45
drivers/rtc/rtc-mrst.c
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@ -45,7 +45,6 @@ struct mrst_rtc {
struct rtc_device *rtc;
struct device *dev;
int irq;
struct resource *iomem;
u8 enabled_wake;
u8 suspend_ctrl;
@ -329,24 +328,22 @@ static int vrtc_mrst_do_probe(struct device *dev, struct resource *iomem,
if (!iomem)
return -ENODEV;
iomem = request_mem_region(iomem->start, resource_size(iomem),
driver_name);
iomem = devm_request_mem_region(dev, iomem->start, resource_size(iomem),
driver_name);
if (!iomem) {
dev_dbg(dev, "i/o mem already in use.\n");
return -EBUSY;
}
mrst_rtc.irq = rtc_irq;
mrst_rtc.iomem = iomem;
mrst_rtc.dev = dev;
dev_set_drvdata(dev, &mrst_rtc);
mrst_rtc.rtc = rtc_device_register(driver_name, dev,
&mrst_rtc_ops, THIS_MODULE);
if (IS_ERR(mrst_rtc.rtc)) {
retval = PTR_ERR(mrst_rtc.rtc);
goto cleanup0;
}
mrst_rtc.rtc = devm_rtc_allocate_device(dev);
if (IS_ERR(mrst_rtc.rtc))
return PTR_ERR(mrst_rtc.rtc);
mrst_rtc.rtc->ops = &mrst_rtc_ops;
rename_region(iomem, dev_name(&mrst_rtc.rtc->dev));
@ -359,23 +356,27 @@ static int vrtc_mrst_do_probe(struct device *dev, struct resource *iomem,
dev_dbg(dev, "TODO: support more than 24-hr BCD mode\n");
if (rtc_irq) {
retval = request_irq(rtc_irq, mrst_rtc_irq,
0, dev_name(&mrst_rtc.rtc->dev),
mrst_rtc.rtc);
retval = devm_request_irq(dev, rtc_irq, mrst_rtc_irq,
0, dev_name(&mrst_rtc.rtc->dev),
mrst_rtc.rtc);
if (retval < 0) {
dev_dbg(dev, "IRQ %d is already in use, err %d\n",
rtc_irq, retval);
goto cleanup1;
goto cleanup0;
}
}
retval = rtc_register_device(mrst_rtc.rtc);
if (retval) {
retval = PTR_ERR(mrst_rtc.rtc);
goto cleanup0;
}
dev_dbg(dev, "initialised\n");
return 0;
cleanup1:
rtc_device_unregister(mrst_rtc.rtc);
cleanup0:
mrst_rtc.dev = NULL;
release_mem_region(iomem->start, resource_size(iomem));
dev_err(dev, "rtc-mrst: unable to initialise\n");
return retval;
}
@ -390,20 +391,10 @@ static void rtc_mrst_do_shutdown(void)
static void rtc_mrst_do_remove(struct device *dev)
{
struct mrst_rtc *mrst = dev_get_drvdata(dev);
struct resource *iomem;
rtc_mrst_do_shutdown();
if (mrst->irq)
free_irq(mrst->irq, mrst->rtc);
rtc_device_unregister(mrst->rtc);
mrst->rtc = NULL;
iomem = mrst->iomem;
release_mem_region(iomem->start, resource_size(iomem));
mrst->iomem = NULL;
mrst->dev = NULL;
}