diff options
| author | Matt Ranostay <mranostay@gmail.com> | 2016-08-25 08:44:49 +0200 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2016-08-29 19:00:46 +0200 |
| commit | 9d1894cd197e297c9ced5393fde6416324b7706d (patch) | |
| tree | 3646f47910242b33b12dafe57f568c8730079efd /drivers/iio | |
| parent | iio: chemical: vz89x: add support for VZ89TE part (diff) | |
| download | linux-9d1894cd197e297c9ced5393fde6416324b7706d.tar.xz linux-9d1894cd197e297c9ced5393fde6416324b7706d.zip | |
iio: chemical: vz89x: prevent corrupted buffer from being read
Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/chemical/vz89x.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/iio/chemical/vz89x.c b/drivers/iio/chemical/vz89x.c index 289d2919deea..cd3870ead3fd 100644 --- a/drivers/iio/chemical/vz89x.c +++ b/drivers/iio/chemical/vz89x.c @@ -55,6 +55,7 @@ struct vz89x_data { struct mutex lock; int (*xfer)(struct vz89x_data *data, u8 cmd); + bool is_valid; unsigned long last_update; u8 buffer[VZ89TE_REG_MEASUREMENT_RD_SIZE]; }; @@ -229,7 +230,10 @@ 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, chip->cmd); if (ret < 0) @@ -239,7 +243,7 @@ static int vz89x_get_measurement(struct vz89x_data *data) if (ret) return -EAGAIN; - data->last_update = jiffies; + data->is_valid = true; return 0; } |