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intel_th: Fix activating a subdevice without a driver

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If output subdevice driver is not loaded, activating it will try to
call its ->activate method and crash. Fix this by explicitly checking
for the driver.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@intel.com>
This commit is contained in:
Alexander Shishkin 2016-03-07 17:04:45 +02:00
parent e8644e4c2a
commit f18a9531f6
2 changed files with 13 additions and 2 deletions
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12
drivers/hwtracing/intel_th/core.c
View file

@ -183,7 +183,11 @@ static DEVICE_ATTR_RO(port);
static int intel_th_output_activate(struct intel_th_device *thdev)
{
struct intel_th_driver *thdrv = to_intel_th_driver(thdev->dev.driver);
struct intel_th_driver *thdrv =
to_intel_th_driver_or_null(thdev->dev.driver);
if (!thdrv)
return -ENODEV;
if (thdrv->activate)
return thdrv->activate(thdev);
@ -195,7 +199,11 @@ static int intel_th_output_activate(struct intel_th_device *thdev)
static void intel_th_output_deactivate(struct intel_th_device *thdev)
{
struct intel_th_driver *thdrv = to_intel_th_driver(thdev->dev.driver);
struct intel_th_driver *thdrv =
to_intel_th_driver_or_null(thdev->dev.driver);
if (!thdrv)
return;
if (thdrv->deactivate)
thdrv->deactivate(thdev);

3
drivers/hwtracing/intel_th/intel_th.h
View file

@ -151,6 +151,9 @@ struct intel_th_driver {
#define to_intel_th_driver(_d) \
container_of((_d), struct intel_th_driver, driver)
#define to_intel_th_driver_or_null(_d) \
((_d) ? to_intel_th_driver(_d) : NULL)
static inline struct intel_th_device *
to_intel_th_hub(struct intel_th_device *thdev)
{