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Commit e2ea295b authored by Alexander Shishkin's avatar Alexander Shishkin
Browse files

intel_th: Hold output driver module reference while capture is active 



Right now it's possible to unload the output subdevice's driver while
the capture to this output is active. Prevent this by holding the
output driver's module reference.

Signed-off-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: default avatarLaurent Fert <laurent.fert@intel.com>
parent a45ff6ed

drivers/hwtracing/intel_th/core.c

+5 −0
Original line number Diff line number Diff line
@@ -189,6 +189,9 @@ static int intel_th_output_activate(struct intel_th_device *thdev) 
	if (!thdrv)

		return -ENODEV;



	if (!try_module_get(thdrv->driver.owner))

		return -ENODEV;



	if (thdrv->activate)

		return thdrv->activate(thdev);
@@ -209,6 +212,8 @@ static void intel_th_output_deactivate(struct intel_th_device *thdev) 
		thdrv->deactivate(thdev);

	else

		intel_th_trace_disable(thdev);



	module_put(thdrv->driver.owner);

}



static ssize_t active_show(struct device *dev, struct device_attribute *attr,