From: Johannes Berg <johannes.berg@xxxxxxxxx>
When fixing the initialization race, we neglected to account for
the fact that debugfs is initialized in wiphy_register(), and
some debugfs things went missing (or rather were rerooted to the
global debugfs root).
Fix this by adding debugfs entries only after wiphy_register().
This requires some changes in the rate control code since it
currently adds debugfs at alloc time, which can no longer be
done after the reordering.
Reported-by: Jouni Malinen <j@xxxxx>
Reported-by: kernel test robot <rong.a.chen@xxxxxxxxx>
Reported-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
Reported-by: Felix Fietkau <nbd@xxxxxxxx>
Fixes: 52e04b4ce5d0 ("mac80211: fix race in ieee80211_register_hw()")
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
drivers/net/wireless/intel/iwlegacy/3945-rs.c | 2 +-
drivers/net/wireless/intel/iwlegacy/4965-rs.c | 2 +-
drivers/net/wireless/intel/iwlwifi/dvm/rs.c | 2 +-
drivers/net/wireless/intel/iwlwifi/mvm/rs.c | 2 +-
drivers/net/wireless/realtek/rtlwifi/rc.c | 2 +-
include/net/mac80211.h | 4 +++-
net/mac80211/main.c | 5 ++--
net/mac80211/rate.c | 15 ++++--------
net/mac80211/rate.h | 23 +++++++++++++++++++
net/mac80211/rc80211_minstrel_ht.c | 19 ++++++++++-----
10 files changed, 51 insertions(+), 25 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlegacy/3945-rs.c b/drivers/net/wireless/intel/iwlegacy/3945-rs.c
index 6209f85a71dd..0af9e997c9f6 100644
--- a/drivers/net/wireless/intel/iwlegacy/3945-rs.c
+++ b/drivers/net/wireless/intel/iwlegacy/3945-rs.c
@@ -374,7 +374,7 @@ il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
}
static void *
-il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
+il3945_rs_alloc(struct ieee80211_hw *hw)
{
return hw->priv;
}
diff --git a/drivers/net/wireless/intel/iwlegacy/4965-rs.c b/drivers/net/wireless/intel/iwlegacy/4965-rs.c
index 7c6e2c863497..0a02d8aca320 100644
--- a/drivers/net/wireless/intel/iwlegacy/4965-rs.c
+++ b/drivers/net/wireless/intel/iwlegacy/4965-rs.c
@@ -2474,7 +2474,7 @@ il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
}
static void *
-il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
+il4965_rs_alloc(struct ieee80211_hw *hw)
{
return hw->priv;
}
diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
index 226165db7dfd..dac809df7f1d 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
@@ -3019,7 +3019,7 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
cpu_to_le16(priv->lib->bt_params->agg_time_limit);
}
-static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
+static void *rs_alloc(struct ieee80211_hw *hw)
{
return hw->priv;
}
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index c1aba2bf73cf..00e7fdbaeb7f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -3665,7 +3665,7 @@ static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
}
-static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
+static void *rs_alloc(struct ieee80211_hw *hw)
{
return hw->priv;
}
diff --git a/drivers/net/wireless/realtek/rtlwifi/rc.c b/drivers/net/wireless/realtek/rtlwifi/rc.c
index 0c7d74902d33..4b5ea0ec9109 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rc.c
@@ -261,7 +261,7 @@ static void rtl_rate_update(void *ppriv,
{
}
-static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
+static void *rtl_rate_alloc(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
return rtlpriv;
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index b6b4de0e4b5e..97fec4d310ac 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -6007,7 +6007,9 @@ enum rate_control_capabilities {
struct rate_control_ops {
unsigned long capa;
const char *name;
- void *(*alloc)(struct ieee80211_hw *hw, struct dentry *debugfsdir);
+ void *(*alloc)(struct ieee80211_hw *hw);
+ void (*add_debugfs)(struct ieee80211_hw *hw, void *priv,
+ struct dentry *debugfsdir);
void (*free)(void *priv);
void *(*alloc_sta)(void *priv, struct ieee80211_sta *sta, gfp_t gfp);
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 0e9ad60fb2b3..6423173bb87e 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1183,8 +1183,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
IEEE80211_TX_STATUS_HEADROOM);
- debugfs_hw_add(local);
-
/*
* if the driver doesn't specify a max listen interval we
* use 5 which should be a safe default
@@ -1273,6 +1271,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
if (result < 0)
goto fail_wiphy_register;
+ debugfs_hw_add(local);
+ rate_control_add_debugfs(local);
+
rtnl_lock();
/* add one default STA interface if supported */
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index a1e9fc7878aa..b051f125d3af 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -214,17 +214,16 @@ static ssize_t rcname_read(struct file *file, char __user *userbuf,
ref->ops->name, len);
}
-static const struct file_operations rcname_ops = {
+const struct file_operations rcname_ops = {
.read = rcname_read,
.open = simple_open,
.llseek = default_llseek,
};
#endif
-static struct rate_control_ref *rate_control_alloc(const char *name,
- struct ieee80211_local *local)
+static struct rate_control_ref *
+rate_control_alloc(const char *name, struct ieee80211_local *local)
{
- struct dentry *debugfsdir = NULL;
struct rate_control_ref *ref;
ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
@@ -234,13 +233,7 @@ static struct rate_control_ref *rate_control_alloc(const char *name,
if (!ref->ops)
goto free;
-#ifdef CONFIG_MAC80211_DEBUGFS
- debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
- local->debugfs.rcdir = debugfsdir;
- debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
-#endif
-
- ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
+ ref->priv = ref->ops->alloc(&local->hw);
if (!ref->priv)
goto free;
return ref;
diff --git a/net/mac80211/rate.h b/net/mac80211/rate.h
index 5397c6dad056..79b44d3db171 100644
--- a/net/mac80211/rate.h
+++ b/net/mac80211/rate.h
@@ -60,6 +60,29 @@ static inline void rate_control_add_sta_debugfs(struct sta_info *sta)
#endif
}
+extern const struct file_operations rcname_ops;
+
+static inline void rate_control_add_debugfs(struct ieee80211_local *local)
+{
+#ifdef CONFIG_MAC80211_DEBUGFS
+ struct dentry *debugfsdir;
+
+ if (!local->rate_ctrl)
+ return;
+
+ if (!local->rate_ctrl->ops->add_debugfs)
+ return;
+
+ debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
+ local->debugfs.rcdir = debugfsdir;
+ debugfs_create_file("name", 0400, debugfsdir,
+ local->rate_ctrl, &rcname_ops);
+
+ local->rate_ctrl->ops->add_debugfs(&local->hw, local->rate_ctrl->priv,
+ debugfsdir);
+#endif
+}
+
void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata);
/* Get a reference to the rate control algorithm. If `name' is NULL, get the
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 694a31978a04..5dc3e5bc4e64 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -1635,7 +1635,7 @@ minstrel_ht_init_cck_rates(struct minstrel_priv *mp)
}
static void *
-minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
+minstrel_ht_alloc(struct ieee80211_hw *hw)
{
struct minstrel_priv *mp;
@@ -1673,7 +1673,17 @@ minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
mp->update_interval = HZ / 10;
mp->new_avg = true;
+ minstrel_ht_init_cck_rates(mp);
+
+ return mp;
+}
+
#ifdef CONFIG_MAC80211_DEBUGFS
+static void minstrel_ht_add_debugfs(struct ieee80211_hw *hw, void *priv,
+ struct dentry *debugfsdir)
+{
+ struct minstrel_priv *mp = priv;
+
mp->fixed_rate_idx = (u32) -1;
debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
&mp->fixed_rate_idx);
@@ -1681,12 +1691,8 @@ minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
&mp->sample_switch);
debugfs_create_bool("new_avg", S_IRUGO | S_IWUSR, debugfsdir,
&mp->new_avg);
-#endif
-
- minstrel_ht_init_cck_rates(mp);
-
- return mp;
}
+#endif
static void
minstrel_ht_free(void *priv)
@@ -1725,6 +1731,7 @@ static const struct rate_control_ops mac80211_minstrel_ht = {
.alloc = minstrel_ht_alloc,
.free = minstrel_ht_free,
#ifdef CONFIG_MAC80211_DEBUGFS
+ .add_debugfs = minstrel_ht_add_debugfs,
.add_sta_debugfs = minstrel_ht_add_sta_debugfs,
#endif
.get_expected_throughput = minstrel_ht_get_expected_throughput,
--
2.25.1
