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authorSamuel Ortiz <sameo@linux.intel.com>2012-06-28 18:41:57 +0400
committerJohn W. Linville <linville@tuxdriver.com>2012-07-10 00:42:21 +0400
commita831b9132065e1aa18acd7910d5f9c164a2f350f (patch)
tree9cbaf7e194641e24e8e2f95e5d6f14cce9b7ff88 /net/nfc
parent1550bf2d59a5ab74c5c14f2e65ed83516ca7d74d (diff)
downloadlinux-a831b9132065e1aa18acd7910d5f9c164a2f350f.tar.xz
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>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/netlink.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 03c31db38f12..99bc6f7faa7b 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -634,6 +634,15 @@ static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
if (!dev)
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);
if (dev->genl_data.poll_req_pid != info->snd_pid) {