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| author | Krishna Kumar <krkumar2@in.ibm.com> | 2009-10-14 23:55:07 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-18 10:57:26 +0400 |
| commit | 988ade6b8e27e79311812f83a87b5cea11fabcd7 (patch) | |
| tree | 864fccbc78ffa108cde15648440b543f8f7e6688 /net/netlink | |
| parent | 93860b08e31a3202b6e67e386811545e719a0165 (diff) | |
| download | linux-988ade6b8e27e79311812f83a87b5cea11fabcd7.tar.xz | |
genetlink: Optimize and one bug fix in genl_generate_id()
1. GENL_MIN_ID is a valid id -> no need to start at
GENL_MIN_ID + 1.
2. Avoid going through the ids two times: If we start at
GENL_MIN_ID+1 (*or bigger*) and all ids are over!, the
code iterates through the list twice (*or lesser*).
3. Simplify code - no need to start at idx=0 which gets
reset to GENL_MIN_ID.
Patch on net-next-2.6. Reboot test shows that first id
passed to genl_register_family was 16, next two were
GENL_ID_GENERATE and genl_generate_id returned 17 & 18
(user level testing of same code shows expected values
across entire range of MIN/MAX).
Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink')
| -rw-r--r-- | net/netlink/genetlink.c | 24 |
1 files changed, 8 insertions, 16 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index ddfdb7d2e02b..d07ecda0a92d 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -97,25 +97,17 @@ static struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family) */ static inline u16 genl_generate_id(void) { - static u16 id_gen_idx; - int overflowed = 0; + static u16 id_gen_idx = GENL_MIN_ID; + int i; - do { - if (id_gen_idx == 0) + for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) { + if (!genl_family_find_byid(id_gen_idx)) + return id_gen_idx; + if (++id_gen_idx > GENL_MAX_ID) id_gen_idx = GENL_MIN_ID; + } - if (++id_gen_idx > GENL_MAX_ID) { - if (!overflowed) { - overflowed = 1; - id_gen_idx = 0; - continue; - } else - return 0; - } - - } while (genl_family_find_byid(id_gen_idx)); - - return id_gen_idx; + return 0; } static struct genl_multicast_group notify_grp; |