diff options
| author | John Stultz <john.stultz@linaro.org> | 2011-05-06 17:24:27 -0700 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2011-05-06 18:01:02 -0700 |
| commit | a015dbc110a97ed3147546a9c914f18f71d798d0 (patch) | |
| tree | 38ad9e7bbb8b37e352d1810a4b48167838615504 /drivers/rtc/rtc-m41t80.c | |
| parent | 9a281a677c1dbf25943b5bc3225de21fcb4945ae (diff) | |
| download | lwn-a015dbc110a97ed3147546a9c914f18f71d798d0.tar.gz lwn-a015dbc110a97ed3147546a9c914f18f71d798d0.zip | |
rtc: m41t80: Initialize clientdata before registering device
Commit f44f7f96a20 ("RTC: Initialize kernel state from RTC") uncovered
an issue in a number of RTC drivers, where the drivers call
rtc_device_register before initializing the clientdata.
This frequently results in null pointer dereferences when the
rtc_device_register immediately makes use of the rtc device, calling
rtc_read_alarm.
The solution is to ensure the clientdata is initialized prior to registering
the rtc device.
CC: Wolfram Sang <w.sang@pengutronix.de>
CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: rtc-linux@googlegroups.com
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'drivers/rtc/rtc-m41t80.c')
| -rw-r--r-- | drivers/rtc/rtc-m41t80.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c index 69fe664a2228..eda128fc1d38 100644 --- a/drivers/rtc/rtc-m41t80.c +++ b/drivers/rtc/rtc-m41t80.c @@ -783,6 +783,9 @@ static int m41t80_probe(struct i2c_client *client, goto exit; } + clientdata->features = id->driver_data; + i2c_set_clientdata(client, clientdata); + rtc = rtc_device_register(client->name, &client->dev, &m41t80_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) { @@ -792,8 +795,6 @@ static int m41t80_probe(struct i2c_client *client, } clientdata->rtc = rtc; - clientdata->features = id->driver_data; - i2c_set_clientdata(client, clientdata); /* Make sure HT (Halt Update) bit is cleared */ rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); |