Merge tag 'staging-4.6-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull IIO driver fixes from Grek KH:
 "It's really just IIO drivers here, some small fixes that resolve some
  'crash on boot' errors that have shown up in the -rc series, and other
  bugfixes that are required.

  All have been in linux-next with no reported problems"

* tag 'staging-4.6-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  iio: imu: mpu6050: Fix name/chip_id when using ACPI
  iio: imu: mpu6050: fix possible NULL dereferences
  iio:adc:at91-sama5d2: Repair crash on module removal
  iio: ak8975: fix maybe-uninitialized warning
  iio: ak8975: Fix NULL pointer exception on early interrupt

4 files changed, 34 insertions, 7 deletions

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index dbee13ad33a3..2e154cb51685 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -451,6 +451,8 @@ static int at91_adc_probe(struct platform_device *pdev)
         if (ret)
                 goto vref_disable;
 
+        platform_set_drvdata(pdev, indio_dev);
+
         ret = iio_device_register(indio_dev);
         if (ret < 0)
                 goto per_clk_disable_unprepare;
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
index f581256d9d4c..5ee4e0dc093e 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
@@ -104,6 +104,19 @@ static int inv_mpu6050_deselect_bypass(struct i2c_adapter *adap,
         return 0;
 }
 
+static const char *inv_mpu_match_acpi_device(struct device *dev, int *chip_id)
+{
+        const struct acpi_device_id *id;
+
+        id = acpi_match_device(dev->driver->acpi_match_table, dev);
+        if (!id)
+                return NULL;
+
+        *chip_id = (int)id->driver_data;
+
+        return dev_name(dev);
+}
+
 /**
  *  inv_mpu_probe() - probe function.
  *  @client:          i2c client.
@@ -115,14 +128,25 @@ static int inv_mpu_probe(struct i2c_client *client,
                          const struct i2c_device_id *id)
 {
         struct inv_mpu6050_state *st;
-        int result;
-        const char *name = id ? id->name : NULL;
+        int result, chip_type;
         struct regmap *regmap;
+        const char *name;
 
         if (!i2c_check_functionality(client->adapter,
                                      I2C_FUNC_SMBUS_I2C_BLOCK))
                 return -EOPNOTSUPP;
 
+        if (id) {
+                chip_type = (int)id->driver_data;
+                name = id->name;
+        } else if (ACPI_HANDLE(&client->dev)) {
+                name = inv_mpu_match_acpi_device(&client->dev, &chip_type);
+                if (!name)
+                        return -ENODEV;
+        } else {
+                return -ENOSYS;
+        }
+
         regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
         if (IS_ERR(regmap)) {
                 dev_err(&client->dev, "Failed to register i2c regmap %d\n",
@@ -131,7 +155,7 @@ static int inv_mpu_probe(struct i2c_client *client,
         }
 
         result = inv_mpu_core_probe(regmap, client->irq, name,
-                                    NULL, id->driver_data);
+                                    NULL, chip_type);
         if (result < 0)
                 return result;
 
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
index dea6c4361de0..7bcb8d839f05 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
@@ -46,6 +46,7 @@ static int inv_mpu_probe(struct spi_device *spi)
         struct regmap *regmap;
         const struct spi_device_id *id = spi_get_device_id(spi);
         const char *name = id ? id->name : NULL;
+        const int chip_type = id ? id->driver_data : 0;
 
         regmap = devm_regmap_init_spi(spi, &inv_mpu_regmap_config);
         if (IS_ERR(regmap)) {
@@ -55,7 +56,7 @@ static int inv_mpu_probe(struct spi_device *spi)
         }
 
         return inv_mpu_core_probe(regmap, spi->irq, name,
-                                  inv_mpu_i2c_disable, id->driver_data);
+                                  inv_mpu_i2c_disable, chip_type);
 }
 
 static int inv_mpu_remove(struct spi_device *spi)
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 9c5c9ef3f1da..0e931a9a1669 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -462,6 +462,8 @@ static int ak8975_setup_irq(struct ak8975_data *data)
         int rc;
         int irq;
 
+        init_waitqueue_head(&data->data_ready_queue);
+        clear_bit(0, &data->flags);
         if (client->irq)
                 irq = client->irq;
         else
@@ -477,8 +479,6 @@ static int ak8975_setup_irq(struct ak8975_data *data)
                 return rc;
         }
 
-        init_waitqueue_head(&data->data_ready_queue);
-        clear_bit(0, &data->flags);
         data->eoc_irq = irq;
 
         return rc;
@@ -732,7 +732,7 @@ static int ak8975_probe(struct i2c_client *client,
         int eoc_gpio;
         int err;
         const char *name = NULL;
-        enum asahi_compass_chipset chipset;
+        enum asahi_compass_chipset chipset = AK_MAX_TYPE;
 
         /* Grab and set up the supplied GPIO. */
         if (client->dev.platform_data)