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| author | Johannes Berg <johannes.berg@intel.com> | 2016-10-24 14:40:01 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-27 16:16:08 -0400 |
| commit | c90c39dab3e02ce45427a214746711f33ad13be6 (patch) | |
| tree | bfd0b747bc412fbe73ea68518df15d149ce8333a /net/netlink/genetlink.c | |
| parent | 4fe77d82ef80c77031c9c6f8554cd0dee2aa423a (diff) | |
| download | linux-c90c39dab3e02ce45427a214746711f33ad13be6.tar.gz linux-c90c39dab3e02ce45427a214746711f33ad13be6.tar.bz2 linux-c90c39dab3e02ce45427a214746711f33ad13be6.zip | |
genetlink: introduce and use genl_family_attrbuf()
This helper function allows family implementations to access
their family's attrbuf. This gets rid of the attrbuf usage
in families, and also adds locking validation, since it's not
valid to use the attrbuf with parallel_ops or outside of the
dumpit callback.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink/genetlink.c')
| -rw-r--r-- | net/netlink/genetlink.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index 23cc12639ba7..01291b7a27bb 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -1096,6 +1096,25 @@ problem: subsys_initcall(genl_init); +/** + * genl_family_attrbuf - return family's attrbuf + * @family: the family + * + * Return the family's attrbuf, while validating that it's + * actually valid to access it. + * + * You cannot use this function with a family that has parallel_ops + * and you can only use it within (pre/post) doit/dumpit callbacks. + */ +struct nlattr **genl_family_attrbuf(struct genl_family *family) +{ + if (!WARN_ON(family->parallel_ops)) + lockdep_assert_held(&genl_mutex); + + return family->attrbuf; +} +EXPORT_SYMBOL(genl_family_attrbuf); + static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group, gfp_t flags) { |