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| author | Evgeniy Polyakov <johnpol@2ka.mipt.ru> | 2006-03-20 22:21:40 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-03-20 22:21:40 -0800 |
| commit | b191ba0d599928372be5a89f75486eb58efab48a (patch) | |
| tree | a0ecc636d121126aba838d49700ad9cfbbf94733 | |
| parent | 0ac81ae34ec8898e7eb1388fe21e3cee7b626a88 (diff) | |
| download | linux-3.10-b191ba0d599928372be5a89f75486eb58efab48a.tar.gz linux-3.10-b191ba0d599928372be5a89f75486eb58efab48a.tar.bz2 linux-3.10-b191ba0d599928372be5a89f75486eb58efab48a.zip | |
[CONNECTOR]: Use netlink_has_listeners() to avoind unnecessary allocations.
Return -ESRCH from cn_netlink_send() when there are not listeners,
just as it could be done by netlink_broadcast(). Propagate
netlink_broadcast() error back to the caller.
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | Documentation/connector/connector.txt | 5 | ||||
| -rw-r--r-- | drivers/connector/connector.c | 7 |
2 files changed, 7 insertions, 5 deletions
diff --git a/Documentation/connector/connector.txt b/Documentation/connector/connector.txt index 57a314b14cf..ad6e0ba7b38 100644 --- a/Documentation/connector/connector.txt +++ b/Documentation/connector/connector.txt @@ -69,10 +69,11 @@ Unregisters new callback with connector core. struct cb_id *id - unique connector's user identifier. -void cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask); +int cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask); Sends message to the specified groups. It can be safely called from -any context, but may silently fail under strong memory pressure. +softirq context, but may silently fail under strong memory pressure. +If there are no listeners for given group -ESRCH can be returned. struct cn_msg * - message header(with attached data). u32 __group - destination group. diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c index 505677fb315..d7125f4d911 100644 --- a/drivers/connector/connector.c +++ b/drivers/connector/connector.c @@ -97,6 +97,9 @@ int cn_netlink_send(struct cn_msg *msg, u32 __group, gfp_t gfp_mask) group = __group; } + if (!netlink_has_listeners(dev->nls, group)) + return -ESRCH; + size = NLMSG_SPACE(sizeof(*msg) + msg->len); skb = alloc_skb(size, gfp_mask); @@ -111,9 +114,7 @@ int cn_netlink_send(struct cn_msg *msg, u32 __group, gfp_t gfp_mask) NETLINK_CB(skb).dst_group = group; - netlink_broadcast(dev->nls, skb, 0, group, gfp_mask); - - return 0; + return netlink_broadcast(dev->nls, skb, 0, group, gfp_mask); nlmsg_failure: kfree_skb(skb); |