Daniel Baluta schrieb am 18.12.2014 um 18:16:
> When using ACPI, if acpi_match_device fails then chipset enum will be
> uninitialized and &ak_def_array[chipset] will point to some bad address.
>
> This fixes the following compilation warning:
>
> drivers/iio/magnetometer/ak8975.c: In function ‘ak8975_probe’:
> drivers/iio/magnetometer/ak8975.c:788:14: warning: ‘chipset’ may be used
> uninitialized in this function [-Wmaybe-uninitialized]
> data->def =ak_def_array[chipset];
>
> Reported-by: Octavian Purdila <octavian.purd...@intel.com>
> Signed-off-by: Daniel Baluta <daniel.bal...@intel.com>
> ---
> This is a RFC because while I'm pretty sure that chipset should be initialized
> with AK_MAX_TYPE in ak8975_match_acpi_device, I am not sure if we can live
> with
> a NULL return value of ak8975_match_acpi_device. Current implementation
> ignores
> return value of ak8975_match_acpi_device.
This seems to be the actual problem: these _match_acpi_device functions return
NULL on failure, and this should be checked for.
>
> The same situation is for kxcjk-1013, bmc150-accel, bmg160 and possible other
> drivers.
>
> drivers/iio/magnetometer/ak8975.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/iio/magnetometer/ak8975.c
> b/drivers/iio/magnetometer/ak8975.c
> index 0d10a4b..cdf9e77 100644
> --- a/drivers/iio/magnetometer/ak8975.c
> +++ b/drivers/iio/magnetometer/ak8975.c
> @@ -716,6 +716,7 @@ static const char *ak8975_match_acpi_device(struct device
> *dev,
> {
> const struct acpi_device_id *id;
>
> + *chipset =K_MAX_TYPE;
> id =cpi_match_device(dev->driver->acpi_match_table, dev);
> if (!id)
> return NULL;
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
