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intel_th: Hold output driver module reference while capture is active

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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: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@intel.com>
This commit is contained in:
Alexander Shishkin
2016-04-08 17:35:04 +03:00
parent a45ff6ed74
commit e2ea295baf
1 changed files with 5 additions and 0 deletions
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5
drivers/hwtracing/intel_th/core.c
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@ -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,