From: Bartosz Golaszewski bgolaszewski@baylibre.com
stable inclusion from linux-4.19.155 commit 90553a7466d0bf67ed67d84c5ea01bf6fc9c821a
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commit d3b14296da69adb7825022f3224ac6137eb30abf upstream.
The way the driver is implemented is buggy for the (admittedly unlikely) use case where there are two RTCs with one having an interrupt configured and the second not. This is caused by the fact that we use a global rtc_class_ops struct which we modify depending on whether the irq number is present or not.
Fix it by using two const ops structs with and without alarm operations. While at it: not being able to request a configured interrupt is an error so don't ignore it and bail out of probe().
Fixes: ed13d89b08e3 ("rtc: Add Epson RX8010SJ RTC driver") Signed-off-by: Bartosz Golaszewski bgolaszewski@baylibre.com Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200914154601.32245-2-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/rtc/rtc-rx8010.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/rtc/rtc-rx8010.c b/drivers/rtc/rtc-rx8010.c index 7ddc22eb5b0f..f4db80f9c1b1 100644 --- a/drivers/rtc/rtc-rx8010.c +++ b/drivers/rtc/rtc-rx8010.c @@ -428,16 +428,26 @@ static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) } }
-static struct rtc_class_ops rx8010_rtc_ops = { +static const struct rtc_class_ops rx8010_rtc_ops_default = { .read_time = rx8010_get_time, .set_time = rx8010_set_time, .ioctl = rx8010_ioctl, };
+static const struct rtc_class_ops rx8010_rtc_ops_alarm = { + .read_time = rx8010_get_time, + .set_time = rx8010_set_time, + .ioctl = rx8010_ioctl, + .read_alarm = rx8010_read_alarm, + .set_alarm = rx8010_set_alarm, + .alarm_irq_enable = rx8010_alarm_irq_enable, +}; + static int rx8010_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + const struct rtc_class_ops *rtc_ops; struct rx8010_data *rx8010; int err = 0;
@@ -468,16 +478,16 @@ static int rx8010_probe(struct i2c_client *client,
if (err) { dev_err(&client->dev, "unable to request IRQ\n"); - client->irq = 0; - } else { - rx8010_rtc_ops.read_alarm = rx8010_read_alarm; - rx8010_rtc_ops.set_alarm = rx8010_set_alarm; - rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable; + return err; } + + rtc_ops = &rx8010_rtc_ops_alarm; + } else { + rtc_ops = &rx8010_rtc_ops_default; }
rx8010->rtc = devm_rtc_device_register(&client->dev, client->name, - &rx8010_rtc_ops, THIS_MODULE); + rtc_ops, THIS_MODULE);
if (IS_ERR(rx8010->rtc)) { dev_err(&client->dev, "unable to register the class device\n");