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mac80211: populate debugfs only after cfg80211 init 

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@w1.fi>
Reported-by: kernel test robot <rong.a.chen@intel.com>
Reported-by: Hauke Mehrtens <hauke@hauke-m.de>
Reported-by: Felix Fietkau <nbd@nbd.name>
Cc: stable@vger.kernel.org
Fixes: 52e04b4ce5 ("mac80211: fix race in ieee80211_register_hw()")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lore.kernel.org/r/20200423111344.0e00d3346f12.Iadc76a03a55093d94391fc672e996a458702875d@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2020-04-23 11:13:49 +02:00
parent 0379861217
commit 6cb5f3ea46
10 changed files with 51 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/intel/iwlegacy/3945-rs.c
View File

@ -374,7 +374,7 @@ out:
}
static void *
il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
il3945_rs_alloc(struct ieee80211_hw *hw)
{
return hw->priv;
}

2
drivers/net/wireless/intel/iwlegacy/4965-rs.c
View File

@ -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;
}

2
drivers/net/wireless/intel/iwlwifi/dvm/rs.c
View File

@ -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;
}

2
drivers/net/wireless/intel/iwlwifi/mvm/rs.c
View File

@ -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;
}

2
drivers/net/wireless/realtek/rtlwifi/rc.c
View File

@ -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;

4
include/net/mac80211.h
View File

@ -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);

5
net/mac80211/main.c
View File

@ -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 */

15
net/mac80211/rate.c
View File

@ -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;

23
net/mac80211/rate.h
View File

@ -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

19
net/mac80211/rc80211_minstrel_ht.c
View File

@ -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,