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Diffstat (limited to 'net/mac80211/chan.c')
-rw-r--r--net/mac80211/chan.c81
1 files changed, 60 insertions, 21 deletions
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 5a7fb0e4f89d..dedf11eeb43c 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -547,8 +547,10 @@ static void ieee80211_change_chanctx(struct ieee80211_local *local,
_ieee80211_change_chanctx(local, ctx, old_ctx, chanreq, NULL);
}
+/* Note: if successful, the returned chanctx is reserved for the link */
static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local *local,
+ struct ieee80211_link_data *link,
const struct ieee80211_chan_req *chanreq,
enum ieee80211_chanctx_mode mode)
{
@@ -560,6 +562,9 @@ ieee80211_find_chanctx(struct ieee80211_local *local,
if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
return NULL;
+ if (WARN_ON(link->reserved_chanctx))
+ return NULL;
+
list_for_each_entry(ctx, &local->chanctx_list, list) {
const struct ieee80211_chan_req *compat;
@@ -578,6 +583,16 @@ ieee80211_find_chanctx(struct ieee80211_local *local,
if (!compat)
continue;
+ /*
+ * Reserve the chanctx temporarily, as the driver might change
+ * active links during callbacks we make into it below and/or
+ * later during assignment, which could (otherwise) cause the
+ * context to actually be removed.
+ */
+ link->reserved_chanctx = ctx;
+ list_add(&link->reserved_chanctx_list,
+ &ctx->reserved_links);
+
ieee80211_change_chanctx(local, ctx, ctx, compat);
return ctx;
@@ -673,7 +688,8 @@ static int ieee80211_add_chanctx(struct ieee80211_local *local,
static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local *local,
const struct ieee80211_chan_req *chanreq,
- enum ieee80211_chanctx_mode mode)
+ enum ieee80211_chanctx_mode mode,
+ bool assign_on_failure)
{
struct ieee80211_chanctx *ctx;
int err;
@@ -685,10 +701,12 @@ ieee80211_new_chanctx(struct ieee80211_local *local,
return ERR_PTR(-ENOMEM);
err = ieee80211_add_chanctx(local, ctx);
- if (err) {
+ if (!assign_on_failure && err) {
kfree(ctx);
return ERR_PTR(err);
}
+ /* We ignored a driver error, see _ieee80211_set_active_links */
+ WARN_ON_ONCE(err && !local->in_reconfig);
list_add_rcu(&ctx->list, &local->chanctx_list);
return ctx;
@@ -794,13 +812,14 @@ static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
}
static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
- struct ieee80211_chanctx *new_ctx)
+ struct ieee80211_chanctx *new_ctx,
+ bool assign_on_failure)
{
struct ieee80211_sub_if_data *sdata = link->sdata;
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *curr_ctx = NULL;
- int ret = 0;
+ int ret;
if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
return -EOPNOTSUPP;
@@ -821,15 +840,20 @@ static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
ieee80211_recalc_chanctx_min_def(local, new_ctx, link);
ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx);
- if (ret)
- goto out;
-
- conf = &new_ctx->conf;
- list_add(&link->assigned_chanctx_list,
- &new_ctx->assigned_links);
+ if (assign_on_failure || !ret) {
+ /* Need to continue, see _ieee80211_set_active_links */
+ WARN_ON_ONCE(ret && !local->in_reconfig);
+ ret = 0;
+
+ /* succeeded, so commit it to the data structures */
+ conf = &new_ctx->conf;
+ list_add(&link->assigned_chanctx_list,
+ &new_ctx->assigned_links);
+ }
+ } else {
+ ret = 0;
}
-out:
rcu_assign_pointer(link->conf->chanctx_conf, conf);
sdata->vif.cfg.idle = !conf;
@@ -1030,7 +1054,8 @@ int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
new_ctx = ieee80211_find_reservation_chanctx(local, chanreq, mode);
if (!new_ctx) {
if (ieee80211_can_create_new_chanctx(local)) {
- new_ctx = ieee80211_new_chanctx(local, chanreq, mode);
+ new_ctx = ieee80211_new_chanctx(local, chanreq, mode,
+ false);
if (IS_ERR(new_ctx))
return PTR_ERR(new_ctx);
} else {
@@ -1286,7 +1311,7 @@ ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link)
list_del(&link->reserved_chanctx_list);
link->reserved_chanctx = NULL;
- err = ieee80211_assign_link_chanctx(link, new_ctx);
+ err = ieee80211_assign_link_chanctx(link, new_ctx, false);
if (err) {
if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
ieee80211_free_chanctx(local, new_ctx, false);
@@ -1682,7 +1707,7 @@ void __ieee80211_link_release_channel(struct ieee80211_link_data *link,
ieee80211_link_unreserve_chanctx(link);
}
- ieee80211_assign_link_chanctx(link, NULL);
+ ieee80211_assign_link_chanctx(link, NULL, false);
if (ieee80211_chanctx_refcount(local, ctx) == 0)
ieee80211_free_chanctx(local, ctx, skip_idle_recalc);
@@ -1693,14 +1718,16 @@ void __ieee80211_link_release_channel(struct ieee80211_link_data *link,
ieee80211_vif_use_reserved_switch(local);
}
-int ieee80211_link_use_channel(struct ieee80211_link_data *link,
- const struct ieee80211_chan_req *chanreq,
- enum ieee80211_chanctx_mode mode)
+int _ieee80211_link_use_channel(struct ieee80211_link_data *link,
+ const struct ieee80211_chan_req *chanreq,
+ enum ieee80211_chanctx_mode mode,
+ bool assign_on_failure)
{
struct ieee80211_sub_if_data *sdata = link->sdata;
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx *ctx;
u8 radar_detect_width = 0;
+ bool reserved = false;
int ret;
lockdep_assert_wiphy(local->hw.wiphy);
@@ -1727,9 +1754,13 @@ int ieee80211_link_use_channel(struct ieee80211_link_data *link,
__ieee80211_link_release_channel(link, false);
- ctx = ieee80211_find_chanctx(local, chanreq, mode);
- if (!ctx)
- ctx = ieee80211_new_chanctx(local, chanreq, mode);
+ ctx = ieee80211_find_chanctx(local, link, chanreq, mode);
+ /* Note: context is now reserved */
+ if (ctx)
+ reserved = true;
+ else
+ ctx = ieee80211_new_chanctx(local, chanreq, mode,
+ assign_on_failure);
if (IS_ERR(ctx)) {
ret = PTR_ERR(ctx);
goto out;
@@ -1737,7 +1768,15 @@ int ieee80211_link_use_channel(struct ieee80211_link_data *link,
ieee80211_link_update_chanreq(link, chanreq);
- ret = ieee80211_assign_link_chanctx(link, ctx);
+ ret = ieee80211_assign_link_chanctx(link, ctx, assign_on_failure);
+
+ if (reserved) {
+ /* remove reservation */
+ WARN_ON(link->reserved_chanctx != ctx);
+ link->reserved_chanctx = NULL;
+ list_del(&link->reserved_chanctx_list);
+ }
+
if (ret) {
/* if assign fails refcount stays the same */
if (ieee80211_chanctx_refcount(local, ctx) == 0)
generated by cgit (git 2.34.1) at 2026-01-07 18:25:05 +0000