media: lirc: do not call close() or open() on unregistered devices
If a lirc chardev is held open after a device is unplugged, rc_close() will be called after rc_unregister_device(). The driver is not expecting any calls at this point, and the iguanair driver causes an oops in this scenario. rc_open() can be called when the device is removed too, by calling open on the chardev whilst the device is being removed. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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@ -863,11 +863,15 @@ int rc_open(struct rc_dev *rdev)
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mutex_lock(&rdev->lock);
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if (!rdev->users++ && rdev->open != NULL)
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rval = rdev->open(rdev);
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if (!rdev->registered) {
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rval = -ENODEV;
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} else {
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if (!rdev->users++ && rdev->open)
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rval = rdev->open(rdev);
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if (rval)
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rdev->users--;
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if (rval)
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rdev->users--;
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}
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mutex_unlock(&rdev->lock);
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@ -886,7 +890,7 @@ void rc_close(struct rc_dev *rdev)
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if (rdev) {
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mutex_lock(&rdev->lock);
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if (!--rdev->users && rdev->close != NULL)
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if (!--rdev->users && rdev->close && rdev->registered)
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rdev->close(rdev);
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mutex_unlock(&rdev->lock);
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