From b86f581f8cdbec3655d400ad952c2203a74edde1 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 29 Sep 2017 11:22:10 +0100 Subject: rtc: pl031: avoid exposing alarm if no interrupt If the RTC has no interrupt, there is little point in exposing the RTC alarm capabilities, as it can't be used as a wakeup source nor can it deliver an event to userspace. Signed-off-by: Russell King Reviewed-by: Linus Walleij Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-pl031.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) (limited to 'drivers/rtc/rtc-pl031.c') diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c index 777da06d53ee..64c77ec1b4ea 100644 --- a/drivers/rtc/rtc-pl031.c +++ b/drivers/rtc/rtc-pl031.c @@ -320,7 +320,7 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id) int ret; struct pl031_local *ldata; struct pl031_vendor_data *vendor = id->data; - struct rtc_class_ops *ops = &vendor->ops; + struct rtc_class_ops *ops; unsigned long time, data; ret = amba_request_regions(adev, NULL); @@ -329,12 +329,14 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id) ldata = devm_kzalloc(&adev->dev, sizeof(struct pl031_local), GFP_KERNEL); - if (!ldata) { + ops = devm_kmemdup(&adev->dev, &vendor->ops, sizeof(vendor->ops), + GFP_KERNEL); + if (!ldata || !ops) { ret = -ENOMEM; goto out; } - ldata->vendor = vendor; + ldata->vendor = vendor; ldata->base = devm_ioremap(&adev->dev, adev->res.start, resource_size(&adev->res)); if (!ldata->base) { @@ -372,6 +374,13 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id) } } + if (!adev->irq[0]) { + /* When there's no interrupt, no point in exposing the alarm */ + ops->read_alarm = NULL; + ops->set_alarm = NULL; + ops->alarm_irq_enable = NULL; + } + device_init_wakeup(&adev->dev, true); ldata->rtc = rtc_device_register("pl031", &adev->dev, ops, THIS_MODULE); -- cgit v1.2.3