From c79be4549ae39edc026aa67eb64a25424542943f Mon Sep 17 00:00:00 2001 From: Allan Stephens Date: Thu, 6 Oct 2011 16:40:55 -0400 Subject: [PATCH] tipc: Optimize detection of duplicate media registration Streamlines the detection of an attempt to register a TIPC media structure using an already registered name or type identifier. The revised logic now reuses an existing routine to detect an existing name and no longer unnecessarily manipulates the media type counter during an unsuccessful registration attempt. Signed-off-by: Allan Stephens Signed-off-by: Paul Gortmaker --- net/tipc/bearer.c | 40 +++++++++++++++++++++------------------- 1 file changed, 21 insertions(+), 19 deletions(-) diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index 75af271b9cfa..9ff89207846a 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -80,6 +80,21 @@ static struct media *media_find(const char *name) return NULL; } +/** + * media_find_id - locates specified media object by type identifier + */ + +static struct media *media_find_id(u8 type) +{ + u32 i; + + for (i = 0; i < media_count; i++) { + if (media_list[i].type_id == type) + return &media_list[i]; + } + return NULL; +} + /** * tipc_register_media - register a media type * @@ -88,8 +103,6 @@ static struct media *media_find(const char *name) int tipc_register_media(struct media *m_ptr) { - u32 media_id; - u32 i; int res = -EINVAL; write_lock_bh(&tipc_net_lock); @@ -121,29 +134,18 @@ int tipc_register_media(struct media *m_ptr) goto exit; } - media_id = media_count++; - if (media_id >= MAX_MEDIA) { + if (media_count >= MAX_MEDIA) { warn("Media <%s> rejected, media limit reached (%u)\n", m_ptr->name, MAX_MEDIA); - media_count--; goto exit; } - for (i = 0; i < media_id; i++) { - if (media_list[i].type_id == m_ptr->type_id) { - warn("Media <%s> rejected, duplicate type (%u)\n", - m_ptr->name, m_ptr->type_id); - media_count--; - goto exit; - } - if (!strcmp(m_ptr->name, media_list[i].name)) { - warn("Media <%s> rejected, duplicate name\n", - m_ptr->name); - media_count--; - goto exit; - } + if (media_find(m_ptr->name) || media_find_id(m_ptr->type_id)) { + warn("Media <%s> rejected, already registered\n", m_ptr->name); + goto exit; } - media_list[media_id] = *m_ptr; + media_list[media_count] = *m_ptr; + media_count++; res = 0; exit: write_unlock_bh(&tipc_net_lock); -- 2.20.1