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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-05 15:38:07 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-05 15:38:07 -0700
commit2b86c4a84377b74a6ec0ec9463feb0803bcb1066 (patch)
tree31e88fad600270dfabe6f04d2557f141035d8988
parent431adc0aeca68d257bd705db50f73e4c19e5690d (diff)
parent393dbe4e18dd5b17b3952c7d36ac88f61ec40924 (diff)
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Merge tag 'iio-fixes-for-4.6d' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-linus
Jonathan writes: Fourth set of IIO fixes for the 4.6 cycle. This last minute set is concerned with a regression in the mpu6050 driver. The regression causes a null pointer dereference on any ACPI device that has one of these present such as the ASUS T100TA Baytrail/T. The issue was known but thought (i.e. missunderstood by me) to only be a possible with no reports, so was routed via the normal merge window. Turns out this was wrong (thanks to Alan for reporting the crash). The pull is just for the null dereference fix and a followup fix that also stops the reported name of the device being NULL. * mpu6050 - Fix a 'possible' NULL dereference introduced as part of splitting the driver to allow both i2c and spi to be supported. The issue affects ACPI systems with this device. - Fix a follow up issue where the name and chip id both get set to null if the device driver instance is instantiated from ACPI tables.
-rw-r--r--drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c30
-rw-r--r--drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c3
2 files changed, 29 insertions, 4 deletions
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)