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authorJohannes Berg <johannes.berg@intel.com>2015-01-16 22:09:00 +0100
committerDavid S. Miller <davem@davemloft.net>2015-01-18 01:03:45 -0500
commit053c095a82cf773075e83d7233b5cc19a1f73ece (patch)
treec787028efa9a73a182a0f338f87b6294cef4b8b9 /fs/dlm
parentede58ef28e105de94475b2b69fa069c9a2ce6933 (diff)
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netlink: make nlmsg_end() and genlmsg_end() void
Contrary to common expectations for an "int" return, these functions return only a positive value -- if used correctly they cannot even return 0 because the message header will necessarily be in the skb. This makes the very common pattern of if (genlmsg_end(...) < 0) { ... } be a whole bunch of dead code. Many places also simply do return nlmsg_end(...); and the caller is expected to deal with it. This also commonly (at least for me) causes errors, because it is very common to write if (my_function(...)) /* error condition */ and if my_function() does "return nlmsg_end()" this is of course wrong. Additionally, there's not a single place in the kernel that actually needs the message length returned, and if anyone needs it later then it'll be very easy to just use skb->len there. Remove this, and make the functions void. This removes a bunch of dead code as described above. The patch adds lines because I did - return nlmsg_end(...); + nlmsg_end(...); + return 0; I could have preserved all the function's return values by returning skb->len, but instead I've audited all the places calling the affected functions and found that none cared. A few places actually compared the return value with <= 0 in dump functionality, but that could just be changed to < 0 with no change in behaviour, so I opted for the more efficient version. One instance of the error I've made numerous times now is also present in net/phonet/pn_netlink.c in the route_dumpit() function - it didn't check for <0 or <=0 and thus broke out of the loop every single time. I've preserved this since it will (I think) have caused the messages to userspace to be formatted differently with just a single message for every SKB returned to userspace. It's possible that this isn't needed for the tools that actually use this, but I don't even know what they are so couldn't test that changing this behaviour would be acceptable. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/netlink.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
index e7cfbaf8d0e2..1e6e227134d7 100644
--- a/fs/dlm/netlink.c
+++ b/fs/dlm/netlink.c
@@ -56,13 +56,8 @@ static int send_data(struct sk_buff *skb)
{
struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
void *data = genlmsg_data(genlhdr);
- int rv;
- rv = genlmsg_end(skb, data);
- if (rv < 0) {
- nlmsg_free(skb);
- return rv;
- }
+ genlmsg_end(skb, data);
return genlmsg_unicast(&init_net, skb, listener_nlportid);
}