[PATCH 15/15] iio: sx9310: use the data of the I2C table

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Josef Bacik <josef@toxicpanda.com>

sx9310_check_whoami() takes the chip information from
device_get_match_data(), which only looks at the OF and ACPI tables, and
dereferences it. For a client which was bound through the i2c_device_id
table, for instance one created with

  echo sx9310 0x28 > /sys/bus/i2c/devices/i2c-1/new_device

it returns NULL, and the kernel oopses as soon as something at that address
answers the read of the WHOAMI register.

The I2C table has the same pointers. Use i2c_get_match_data(), which falls
back to it.

Fixes: 21fd3b1373f6 ("iio: proximity: sx9310: Convert enum->pointer for match data table")
Cc: stable <stable@kernel.org>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: David Lechner <dlechner@baylibre.com>
Cc: "Nuno Sá" <nuno.sa@analog.com>
Cc: Andy Shevchenko <andy@kernel.org>
Cc: "Uwe Kleine-König (The Capable Hub)" <u.kleine-koenig@baylibre.com>
Cc: Siratul Islam <email@sirat.me>
Cc: Matti Vaittinen <mazziesaccount@gmail.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iio/proximity/sx9310.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 79ba46d8a0aa..2585b9c6fb69 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -891,7 +891,7 @@ static int sx9310_check_whoami(struct device *dev,
 	if (ret)
 		return ret;
 
-	ddata = device_get_match_data(dev);
+	ddata = i2c_get_match_data(data->client);
 	if (ddata->whoami != whoami)
 		return -ENODEV;
 

-- 
2.56.0