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authorArnd Bergmann <arnd@arndb.de>2017-11-27 12:51:48 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-08 16:03:41 +0100
commita4493f227d931006e7919dd7a46d7069c4627a3c (patch)
treed3734c9d857ef154fe9dadbce096eab2cbdc4843 /drivers/iio
parentiio: dummy_evgen: modify the return value check for irq_sim_init() (diff)
downloadlinux-a4493f227d931006e7919dd7a46d7069c4627a3c.tar.xz
linux-a4493f227d931006e7919dd7a46d7069c4627a3c.zip
iio: common: ssp_sensors: use ktime_get_real_ns() timestamps
getnstimeofday() suffers from the overflow in y2038 on 32-bit architectures and requires a conversion into the nanosecond format that we want here. This changes ssp_parse_dataframe() to use ktime_get_real_ns() directly, which does not have that problem. An open question is what time base should be used here. Normally timestamps should use ktime_get_ns() or ktime_get_boot_ns() to read monotonic time instead of "real" time, which suffers from time jumps due to settimeofday() calls or leap seconds. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/common/ssp_sensors/ssp_spi.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/ssp_sensors/ssp_spi.c
index 704284a475ae..2ab106bb3e03 100644
--- a/drivers/iio/common/ssp_sensors/ssp_spi.c
+++ b/drivers/iio/common/ssp_sensors/ssp_spi.c
@@ -277,12 +277,9 @@ static int ssp_handle_big_data(struct ssp_data *data, char *dataframe, int *idx)
static int ssp_parse_dataframe(struct ssp_data *data, char *dataframe, int len)
{
int idx, sd;
- struct timespec ts;
struct ssp_sensor_data *spd;
struct iio_dev **indio_devs = data->sensor_devs;
- getnstimeofday(&ts);
-
for (idx = 0; idx < len;) {
switch (dataframe[idx++]) {
case SSP_MSG2AP_INST_BYPASS_DATA:
@@ -329,7 +326,7 @@ static int ssp_parse_dataframe(struct ssp_data *data, char *dataframe, int len)
}
if (data->time_syncing)
- data->timestamp = ts.tv_sec * 1000000000ULL + ts.tv_nsec;
+ data->timestamp = ktime_get_real_ns();
return 0;
}