From 5702dbab687e19792102200b085108f00ab820c9 Mon Sep 17 00:00:00 2001 From: Jon Paul Maloy Date: Tue, 10 Dec 2013 20:45:39 -0800 Subject: [PATCH] tipc: initiate media type array at compile time Communication media types are abstracted through the struct 'tipc_media', one per media type. These structs are allocated statically inside their respective media file. Furthermore, in order to be able to reach all instances from a central location, we keep a static array with pointers to these structs. This array is currently initialized at runtime, under protection of tipc_net_lock. However, since the contents of the array itself never changes after initialization, we can just as well initialize it at compile time and make it 'const', at the same time making it obvious that no lock protection is needed here. This commit makes the array constant and removes the redundant lock protection. Signed-off-by: Ying Xue Reviewed-by: Paul Gortmaker Signed-off-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/bearer.c | 63 +++++++++++--------------------------------- net/tipc/bearer.h | 5 ++-- net/tipc/eth_media.c | 10 +++---- net/tipc/ib_media.c | 7 +---- 4 files changed, 23 insertions(+), 62 deletions(-) diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index c2101c0bfd6d..826aa9fdf45f 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -1,7 +1,7 @@ /* * net/tipc/bearer.c: TIPC bearer code * - * Copyright (c) 1996-2006, Ericsson AB + * Copyright (c) 1996-2006, 2013, Ericsson AB * Copyright (c) 2004-2006, 2010-2011, Wind River Systems * All rights reserved. * @@ -41,8 +41,13 @@ #define MAX_ADDR_STR 60 -static struct tipc_media *media_list[MAX_MEDIA]; -static u32 media_count; +static struct tipc_media * const media_list[] = { + ð_media_info, +#ifdef CONFIG_TIPC_MEDIA_IB + &ib_media_info, +#endif + NULL +}; struct tipc_bearer tipc_bearers[MAX_BEARERS]; @@ -55,11 +60,11 @@ struct tipc_media *tipc_media_find(const char *name) { u32 i; - for (i = 0; i < media_count; i++) { + for (i = 0; media_list[i] != NULL; i++) { if (!strcmp(media_list[i]->name, name)) - return media_list[i]; + break; } - return NULL; + return media_list[i]; } /** @@ -69,44 +74,11 @@ static struct tipc_media *media_find_id(u8 type) { u32 i; - for (i = 0; i < media_count; i++) { + for (i = 0; media_list[i] != NULL; i++) { if (media_list[i]->type_id == type) - return media_list[i]; + break; } - return NULL; -} - -/** - * tipc_register_media - register a media type - * - * Bearers for this media type must be activated separately at a later stage. - */ -int tipc_register_media(struct tipc_media *m_ptr) -{ - int res = -EINVAL; - - write_lock_bh(&tipc_net_lock); - - if ((strlen(m_ptr->name) + 1) > TIPC_MAX_MEDIA_NAME) - goto exit; - if (m_ptr->priority > TIPC_MAX_LINK_PRI) - goto exit; - if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) || - (m_ptr->tolerance > TIPC_MAX_LINK_TOL)) - goto exit; - if (media_count >= MAX_MEDIA) - goto exit; - if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id)) - goto exit; - - media_list[media_count] = m_ptr; - media_count++; - res = 0; -exit: - write_unlock_bh(&tipc_net_lock); - if (res) - pr_warn("Media <%s> registration error\n", m_ptr->name); - return res; + return media_list[i]; } /** @@ -144,13 +116,11 @@ struct sk_buff *tipc_media_get_names(void) if (!buf) return NULL; - read_lock_bh(&tipc_net_lock); - for (i = 0; i < media_count; i++) { + for (i = 0; media_list[i] != NULL; i++) { tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, media_list[i]->name, strlen(media_list[i]->name) + 1); } - read_unlock_bh(&tipc_net_lock); return buf; } @@ -247,7 +217,7 @@ struct sk_buff *tipc_bearer_get_names(void) return NULL; read_lock_bh(&tipc_net_lock); - for (i = 0; i < media_count; i++) { + for (i = 0; media_list[i] != NULL; i++) { for (j = 0; j < MAX_BEARERS; j++) { b_ptr = &tipc_bearers[j]; if (b_ptr->active && (b_ptr->media == media_list[i])) { @@ -472,5 +442,4 @@ void tipc_bearer_stop(void) if (tipc_bearers[i].active) bearer_disable(&tipc_bearers[i]); } - media_count = 0; } diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h index cc780bbedbb9..516af8c0577d 100644 --- a/net/tipc/bearer.h +++ b/net/tipc/bearer.h @@ -1,7 +1,7 @@ /* * net/tipc/bearer.h: Include file for TIPC bearer code * - * Copyright (c) 1996-2006, Ericsson AB + * Copyright (c) 1996-2006, 2013, Ericsson AB * Copyright (c) 2005, 2010-2011, Wind River Systems * All rights reserved. * @@ -157,7 +157,6 @@ extern struct tipc_bearer tipc_bearers[]; /* * TIPC routines available to supported media types */ -int tipc_register_media(struct tipc_media *m_ptr); void tipc_recv_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr); @@ -171,10 +170,12 @@ int tipc_disable_bearer(const char *name); */ int tipc_eth_media_start(void); void tipc_eth_media_stop(void); +extern struct tipc_media eth_media_info; #ifdef CONFIG_TIPC_MEDIA_IB int tipc_ib_media_start(void); void tipc_ib_media_stop(void); +extern struct tipc_media ib_media_info; #else static inline int tipc_ib_media_start(void) { return 0; } static inline void tipc_ib_media_stop(void) { return; } diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c index 1e3c33250db3..37fb145476ec 100644 --- a/net/tipc/eth_media.c +++ b/net/tipc/eth_media.c @@ -1,7 +1,7 @@ /* * net/tipc/eth_media.c: Ethernet bearer support for TIPC * - * Copyright (c) 2001-2007, Ericsson AB + * Copyright (c) 2001-2007, 2013, Ericsson AB * Copyright (c) 2005-2008, 2011-2013, Wind River Systems * All rights reserved. * @@ -57,7 +57,7 @@ struct eth_media { struct work_struct cleanup; }; -static struct tipc_media eth_media_info; + static struct eth_media eth_media_array[MAX_ETH_MEDIA]; static int eth_started; @@ -315,7 +315,7 @@ static int eth_msg2addr(const struct tipc_bearer *tb_ptr, /* * Ethernet media registration info */ -static struct tipc_media eth_media_info = { +struct tipc_media eth_media_info = { .send_msg = send_msg, .enable_media = enable_media, .disable_media = disable_media, @@ -342,10 +342,6 @@ int tipc_eth_media_start(void) if (eth_started) return -EINVAL; - res = tipc_register_media(ð_media_info); - if (res) - return res; - res = register_netdevice_notifier(¬ifier); if (!res) eth_started = 1; diff --git a/net/tipc/ib_media.c b/net/tipc/ib_media.c index cbe7fe15cc7c..48e1c07842e6 100644 --- a/net/tipc/ib_media.c +++ b/net/tipc/ib_media.c @@ -60,7 +60,6 @@ struct ib_media { struct work_struct cleanup; }; -static struct tipc_media ib_media_info; static struct ib_media ib_media_array[MAX_IB_MEDIA]; static int ib_started; @@ -311,7 +310,7 @@ static int ib_msg2addr(const struct tipc_bearer *tb_ptr, /* * InfiniBand media registration info */ -static struct tipc_media ib_media_info = { +struct tipc_media ib_media_info = { .send_msg = send_msg, .enable_media = enable_media, .disable_media = disable_media, @@ -338,10 +337,6 @@ int tipc_ib_media_start(void) if (ib_started) return -EINVAL; - res = tipc_register_media(&ib_media_info); - if (res) - return res; - res = register_netdevice_notifier(¬ifier); if (!res) ib_started = 1;