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[media] rtl2832_sdr: refcount to rtl28xxu 

We are consumer of DVB frontend provided by rtl28xxu module. Due to
that we must use refcount to ensure none could remove rtl28xxu when
we are alive (or when we are streaming, if more fine-grained
refcounting is wanted).

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2014-12-17 08:25:03 -03:00 committed by Mauro Carvalho Chehab
parent 6a53fa2350
commit d5eec231be
1 changed files with 15 additions and 2 deletions
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17
drivers/media/dvb-frontends/rtl2832_sdr.c
View File

@ -1310,10 +1310,21 @@ static int rtl2832_sdr_probe(struct platform_device *pdev)
ret = -EINVAL;
goto err;
}
if (!pdev->dev.parent->driver) {
dev_dbg(&pdev->dev, "No parent device\n");
ret = -EINVAL;
goto err;
}
/* try to refcount host drv since we are the consumer */
if (!try_module_get(pdev->dev.parent->driver->owner)) {
dev_err(&pdev->dev, "Refcount fail");
ret = -EINVAL;
goto err;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
ret = -ENOMEM;
goto err;
goto err_module_put;
}
/* setup the state */
@ -1426,6 +1437,8 @@ err_v4l2_ctrl_handler_free:
v4l2_ctrl_handler_free(&dev->hdl);
err_kfree:
kfree(dev);
err_module_put:
module_put(pdev->dev.parent->driver->owner);
err:
return ret;
}
@ -1444,8 +1457,8 @@ static int rtl2832_sdr_remove(struct platform_device *pdev)
video_unregister_device(&dev->vdev);
mutex_unlock(&dev->v4l2_lock);
mutex_unlock(&dev->vb_queue_lock);
v4l2_device_put(&dev->v4l2_dev);
module_put(pdev->dev.parent->driver->owner);
return 0;
}