forked from Minki/linux
6cb5f3ea46
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>
111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
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*/
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#ifndef IEEE80211_RATE_H
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#define IEEE80211_RATE_H
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "sta_info.h"
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#include "driver-ops.h"
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struct rate_control_ref {
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const struct rate_control_ops *ops;
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void *priv;
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};
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void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta,
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struct ieee80211_tx_rate_control *txrc);
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void rate_control_tx_status(struct ieee80211_local *local,
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struct ieee80211_supported_band *sband,
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struct ieee80211_tx_status *st);
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void rate_control_rate_init(struct sta_info *sta);
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void rate_control_rate_update(struct ieee80211_local *local,
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struct ieee80211_supported_band *sband,
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struct sta_info *sta, u32 changed);
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static inline void *rate_control_alloc_sta(struct rate_control_ref *ref,
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struct sta_info *sta, gfp_t gfp)
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{
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spin_lock_init(&sta->rate_ctrl_lock);
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return ref->ops->alloc_sta(ref->priv, &sta->sta, gfp);
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}
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static inline void rate_control_free_sta(struct sta_info *sta)
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{
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struct rate_control_ref *ref = sta->rate_ctrl;
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struct ieee80211_sta *ista = &sta->sta;
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void *priv_sta = sta->rate_ctrl_priv;
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ref->ops->free_sta(ref->priv, ista, priv_sta);
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}
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static inline void rate_control_add_sta_debugfs(struct sta_info *sta)
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{
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct rate_control_ref *ref = sta->rate_ctrl;
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if (ref && sta->debugfs_dir && ref->ops->add_sta_debugfs)
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ref->ops->add_sta_debugfs(ref->priv, sta->rate_ctrl_priv,
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sta->debugfs_dir);
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#endif
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}
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extern const struct file_operations rcname_ops;
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static inline void rate_control_add_debugfs(struct ieee80211_local *local)
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{
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct dentry *debugfsdir;
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if (!local->rate_ctrl)
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return;
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if (!local->rate_ctrl->ops->add_debugfs)
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return;
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debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
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local->debugfs.rcdir = debugfsdir;
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debugfs_create_file("name", 0400, debugfsdir,
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local->rate_ctrl, &rcname_ops);
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local->rate_ctrl->ops->add_debugfs(&local->hw, local->rate_ctrl->priv,
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debugfsdir);
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#endif
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}
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void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata);
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/* Get a reference to the rate control algorithm. If `name' is NULL, get the
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* first available algorithm. */
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int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
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const char *name);
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void rate_control_deinitialize(struct ieee80211_local *local);
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/* Rate control algorithms */
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#ifdef CONFIG_MAC80211_RC_MINSTREL
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int rc80211_minstrel_init(void);
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void rc80211_minstrel_exit(void);
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#else
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static inline int rc80211_minstrel_init(void)
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{
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return 0;
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}
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static inline void rc80211_minstrel_exit(void)
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{
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}
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#endif
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#endif /* IEEE80211_RATE_H */
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