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platform_kernel-5.15
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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 <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Allan Stephens 2011-10-06 16:40:55 -04:00 committed by Paul Gortmaker
parent 706767da1b
commit c79be4549a
1 changed files with 21 additions and 19 deletions
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40
net/tipc/bearer.c
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@ -80,6 +80,21 @@ static struct media *media_find(const char *name)
return NULL; 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 * 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) int tipc_register_media(struct media *m_ptr)
{ {
u32 media_id;
u32 i;
int res = -EINVAL; int res = -EINVAL;
write_lock_bh(&tipc_net_lock); write_lock_bh(&tipc_net_lock);
@ -121,29 +134,18 @@ int tipc_register_media(struct media *m_ptr)
goto exit; goto exit;
} }
media_id = media_count++; if (media_count >= MAX_MEDIA) {
if (media_id >= MAX_MEDIA) {
warn("Media <%s> rejected, media limit reached (%u)\n", warn("Media <%s> rejected, media limit reached (%u)\n",
m_ptr->name, MAX_MEDIA); m_ptr->name, MAX_MEDIA);
media_count--;
goto exit; goto exit;
} }
for (i = 0; i < media_id; i++) { if (media_find(m_ptr->name) || media_find_id(m_ptr->type_id)) {
if (media_list[i].type_id == m_ptr->type_id) { warn("Media <%s> rejected, already registered\n", m_ptr->name);
warn("Media <%s> rejected, duplicate type (%u)\n", goto exit;
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;
}
} }
media_list[media_id] = *m_ptr; media_list[media_count] = *m_ptr;
media_count++;
res = 0; res = 0;
exit: exit:
write_unlock_bh(&tipc_net_lock); write_unlock_bh(&tipc_net_lock);