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team: do RCU update path fixups 

Use rcu_access_pointer and rcu_dereference_protected
to access RCU pointer by updater.
Use RCU_INIT_POINTER for NULL assignment of RCU pointer.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2012-06-20 08:39:39 +00:00 committed by David S. Miller
parent f643776e4d
commit 6dab015cf8
2 changed files with 16 additions and 6 deletions
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8
drivers/net/team/team_mode_activebackup.c
View File

@ -61,8 +61,12 @@ static void ab_port_leave(struct team *team, struct team_port *port)
static int ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
{
if (ab_priv(team)->active_port)
ctx->data.u32_val = ab_priv(team)->active_port->dev->ifindex;
struct team_port *active_port;
active_port = rcu_dereference_protected(ab_priv(team)->active_port,
lockdep_is_held(&team->lock));
if (active_port)
ctx->data.u32_val = active_port->dev->ifindex;
else
ctx->data.u32_val = 0;
return 0;

14
drivers/net/team/team_mode_loadbalance.c
View File

@ -96,8 +96,8 @@ static void lb_tx_hash_to_port_mapping_null_port(struct team *team,
struct lb_port_mapping *pm;
pm = &lb_priv->ex->tx_hash_to_port_mapping[i];
if (pm->port == port) {
rcu_assign_pointer(pm->port, NULL);
if (rcu_access_pointer(pm->port) == port) {
RCU_INIT_POINTER(pm->port, NULL);
team_option_inst_set_change(pm->opt_inst_info);
changed = true;
}
@ -274,6 +274,7 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
{
struct lb_priv *lb_priv = get_lb_priv(team);
struct sk_filter *fp = NULL;
struct sk_filter *orig_fp;
struct sock_fprog *fprog = NULL;
int err;
@ -292,7 +293,9 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
if (lb_priv->ex->orig_fprog) {
/* Clear old filter data */
__fprog_destroy(lb_priv->ex->orig_fprog);
sk_unattached_filter_destroy(lb_priv->fp);
orig_fp = rcu_dereference_protected(lb_priv->fp,
lockdep_is_held(&team->lock));
sk_unattached_filter_destroy(orig_fp);
}
rcu_assign_pointer(lb_priv->fp, fp);
@ -303,9 +306,12 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
{
struct lb_priv *lb_priv = get_lb_priv(team);
lb_select_tx_port_func_t *func;
char *name;
name = lb_select_tx_port_get_name(lb_priv->select_tx_port_func);
func = rcu_dereference_protected(lb_priv->select_tx_port_func,
lockdep_is_held(&team->lock));
name = lb_select_tx_port_get_name(func);
BUG_ON(!name);
ctx->data.str_val = name;
return 0;