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NFC: Do not return EBUSY when stopping a poll that's already stopped
We check for the polling flag before checking if the netlink PID caller match. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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@ -634,6 +634,15 @@ static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
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if (!dev)
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return -ENODEV;
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device_lock(&dev->dev);
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if (!dev->polling) {
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device_unlock(&dev->dev);
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return -EINVAL;
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}
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device_unlock(&dev->dev);
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mutex_lock(&dev->genl_data.genl_data_mutex);
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if (dev->genl_data.poll_req_pid != info->snd_pid) {
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