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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>
This commit is contained in:
Samuel Ortiz 2012-06-28 16:41:57 +02:00 committed by John W. Linville
parent 1550bf2d59
commit a831b91320
1 changed files with 9 additions and 0 deletions
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9
net/nfc/netlink.c
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@ -634,6 +634,15 @@ static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
if (!dev) if (!dev)
return -ENODEV; return -ENODEV;
device_lock(&dev->dev);
if (!dev->polling) {
device_unlock(&dev->dev);
return -EINVAL;
}
device_unlock(&dev->dev);
mutex_lock(&dev->genl_data.genl_data_mutex); mutex_lock(&dev->genl_data.genl_data_mutex);
if (dev->genl_data.poll_req_pid != info->snd_pid) { if (dev->genl_data.poll_req_pid != info->snd_pid) {