On 12/5/2017 5:04 PM, Rafael J. Wysocki wrote:
> On Tue, Dec 5, 2017 at 6:04 PM, Sinan Kaya <okaya@xxxxxxxxxxxxxx> wrote:
>> OF has of_device_get_match_data() function to extract driver specific data
>> structure. Add a similar function for ACPI.
>>
>> Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
>> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Not sure yet, sorry.
OK. no problem.
>
>> ---
>> drivers/acpi/bus.c | 12 ++++++++++++
>> include/linux/acpi.h | 6 ++++++
>> 2 files changed, 18 insertions(+)
>>
>> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
>> index 4d0979e..b271eb1 100644
>> --- a/drivers/acpi/bus.c
>> +++ b/drivers/acpi/bus.c
>> @@ -785,6 +785,18 @@ const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
>> }
>> EXPORT_SYMBOL_GPL(acpi_match_device);
>>
>> +void *acpi_get_match_data(const struct device *dev)
>> +{
>> + const struct acpi_device_id *match;
>> +
>> + match = acpi_match_device(dev->driver->acpi_match_table, dev);
>
> Shouldn't this check dev->driver against NULL before dereferencing it?
I'm adding these checks. I realized that acpi_match_device() is not validating
the ids either.
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -789,6 +789,12 @@ void *acpi_get_match_data(const struct device *dev)
{
const struct acpi_device_id *match;
+ if (!dev->driver)
+ return NULL;
+
+ if (!dev->driver->acpi_match_table)
+ return NULL;
+
I'll hold onto posting this until I hear back from Sakari.
Sinan
--
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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