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| author | Russell King <rmk+kernel@armlinux.org.uk> | 2017-09-29 11:22:10 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-10-12 16:30:25 +0200 |
| commit | b86f581f8cdbec3655d400ad952c2203a74edde1 (patch) | |
| tree | a3ea7d4d259a1d4c781532a9ed6c9a36b7b64d5e /drivers/rtc/rtc-pl031.c | |
| parent | 273c868e85a56481ccb34822be2033dbe63248fb (diff) | |
| download | linux-stable-b86f581f8cdbec3655d400ad952c2203a74edde1.tar.gz linux-stable-b86f581f8cdbec3655d400ad952c2203a74edde1.tar.bz2 linux-stable-b86f581f8cdbec3655d400ad952c2203a74edde1.zip | |
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 <rmk+kernel@armlinux.org.uk>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc/rtc-pl031.c')
| -rw-r--r-- | drivers/rtc/rtc-pl031.c | 15 |
1 files changed, 12 insertions, 3 deletions
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); |