Signed-off-by: Matt Ranostay <mranostay@xxxxxxxxx>
---
drivers/iio/chemical/vz89x.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/chemical/vz89x.c b/drivers/iio/chemical/vz89x.c
index 0347761ebdba..c2a311c59190 100644
--- a/drivers/iio/chemical/vz89x.c
+++ b/drivers/iio/chemical/vz89x.c
@@ -54,6 +54,7 @@ struct vz89x_data {
int (*xfer)(struct vz89x_data *data, u8 cmd);
int (*valid)(struct vz89x_data *data);
+ bool is_valid;
unsigned long last_update;
u8 cmd;
u8 write_size;
@@ -220,8 +221,10 @@ static int vz89x_get_measurement(struct vz89x_data *data)
/* sensor can only be polled once a second max per datasheet */
if (!time_after(jiffies, data->last_update + HZ))
- return 0;
+ return data->is_valid ? 0 : -EAGAIN;
+ data->is_valid = false;
+ data->last_update = jiffies;
ret = data->xfer(data, data->cmd);
if (ret < 0)
return ret;
@@ -230,7 +233,7 @@ static int vz89x_get_measurement(struct vz89x_data *data)
if (ret)
return -EAGAIN;
- data->last_update = jiffies;
+ data->is_valid = true;
return 0;
}
--
2.7.4
--
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