Messages in this thread Patch in this message | | | From | Alexander Shishkin <> | Subject | [QUEUED v20160408 16/18] intel_th: Hold output driver module reference while capture is active | Date | Fri, 8 Apr 2016 17:56:39 +0300 |
| |
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> --- drivers/hwtracing/intel_th/core.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index 20339470c2..1be543e8e4 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -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, -- 2.8.0.rc3
| |