[PATCH 4.20 09/50] iio: ti-ads8688: Update buffer allocation for timestamps

Greg Kroah-Hartman
2019-02-13T18:47:29Z

From: Dan Murphy <dmurphy@ti.com>

commit f214ff521fb1f861c8d7f7d0af98b06bf61b3369 upstream.

Per Jonathan Cameron, the buffer needs to allocate room for a
64 bit timestamp as well as the channels. Change the buffer
to allocate this additional space.

Fixes: 2a86487786b5c ("iio: adc: ti-ads8688: add trigger and buffer support")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/iio/adc/ti-ads8688.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/iio/adc/ti-ads8688.c
+++ b/drivers/iio/adc/ti-ads8688.c
@@ -41,6 +41,7 @@

#define ADS8688_VREF_MV 4096
#define ADS8688_REALBITS 16
+#define ADS8688_MAX_CHANNELS 8

/*
* enum ads8688_range - ADS8688 reference voltage range
@@ -385,7 +386,7 @@ static irqreturn_t ads8688_trigger_handl
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
- u16 buffer[8];
+ u16 buffer[ADS8688_MAX_CHANNELS + sizeof(s64)/sizeof(u16)];
int i, j = 0;

for (i = 0; i < indio_dev->masklength; i++) {