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staging: rtl8723bs: remove a second possible deadlock

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Lockdep complains about rtw_free_assoc_resources() taking the sta_hash_lock
followed by it calling rtw_free_stainfo() which takes xmitpriv->lock.
While the rtl8723bs_xmit_thread takes the sta_hash_lock while already
holding the xmitpriv->lock:

[  103.849756] ======================================================
[  103.849761] WARNING: possible circular locking dependency detected
[  103.849767] 5.15.0-rc1+ #470 Tainted: G         C  E
[  103.849773] ------------------------------------------------------
[  103.849776] wpa_supplicant/695 is trying to acquire lock:
[  103.849781] ffffa5d0c0562b00 (&pxmitpriv->lock){+.-.}-{2:2}, at: rtw_free_stainfo+0x8a/0x510 [r8723bs]
[  103.849840]
               but task is already holding lock:
[  103.849843] ffffa5d0c05636a8 (&pstapriv->sta_hash_lock){+.-.}-{2:2}, at: rtw_free_assoc_resources+0x48/0x110 [r8723bs]
[  103.849881]
               which lock already depends on the new lock.

[  103.849884]
               the existing dependency chain (in reverse order) is:
[  103.849887]
               -> #1 (&pstapriv->sta_hash_lock){+.-.}-{2:2}:
[  103.849898]        _raw_spin_lock_bh+0x34/0x40
[  103.849913]        rtw_get_stainfo+0x93/0x110 [r8723bs]
[  103.849948]        rtw_make_wlanhdr+0x14a/0x270 [r8723bs]
[  103.849983]        rtw_xmitframe_coalesce+0x5c/0x6c0 [r8723bs]
[  103.850019]        rtl8723bs_xmit_thread+0x4ac/0x620 [r8723bs]
[  103.850050]        kthread+0x143/0x160
[  103.850058]        ret_from_fork+0x22/0x30
[  103.850067]
               -> #0 (&pxmitpriv->lock){+.-.}-{2:2}:
[  103.850077]        __lock_acquire+0x1158/0x1de0
[  103.850084]        lock_acquire+0xb5/0x2b0
[  103.850090]        _raw_spin_lock_bh+0x34/0x40
[  103.850095]        rtw_free_stainfo+0x8a/0x510 [r8723bs]
[  103.850130]        rtw_free_assoc_resources+0x53/0x110 [r8723bs]
[  103.850159]        PHY_IQCalibrate_8723B+0x122b/0x36a0 [r8723bs]
[  103.850189]        cfg80211_disconnect+0x173/0x320 [cfg80211]
[  103.850331]        nl80211_disconnect+0x6e/0xb0 [cfg80211]
[  103.850422]        genl_family_rcv_msg_doit+0xcd/0x110
[  103.850430]        genl_rcv_msg+0xce/0x1c0
[  103.850435]        netlink_rcv_skb+0x50/0xf0
[  103.850441]        genl_rcv+0x24/0x40
[  103.850446]        netlink_unicast+0x16d/0x230
[  103.850452]        netlink_sendmsg+0x22b/0x450
[  103.850457]        sock_sendmsg+0x5e/0x60
[  103.850465]        ____sys_sendmsg+0x22f/0x270
[  103.850472]        ___sys_sendmsg+0x81/0xc0
[  103.850479]        __sys_sendmsg+0x49/0x80
[  103.850485]        do_syscall_64+0x3b/0x90
[  103.850493]        entry_SYSCALL_64_after_hwframe+0x44/0xae
[  103.850500]
               other info that might help us debug this:

[  103.850504]  Possible unsafe locking scenario:

[  103.850507]        CPU0                    CPU1
[  103.850510]        ----                    ----
[  103.850512]   lock(&pstapriv->sta_hash_lock);
[  103.850518]                                lock(&pxmitpriv->lock);
[  103.850524]                                lock(&pstapriv->sta_hash_lock);
[  103.850530]   lock(&pxmitpriv->lock);
[  103.850535]
                *** DEADLOCK ***

Push the taking of sta_hash_lock down into rtw_free_stainfo(),
where the critical section is, this allows taking the lock after
rtw_free_stainfo() has released pxmitpriv->lock.

This requires changing rtw_free_all_stainfo() so that it does its freeing
in 2 steps, first moving all stainfo-s to free to a local list while
holding the sta_hash_lock and then walking that list to call
rtw_free_stainfo() on them without holding the sta_hash_lock.

Pushing the taking of sta_hash_lock down into rtw_free_stainfo(),
also fixes a whole bunch of callers of rtw_free_stainfo() which
were not holding that lock even though they should.

Note that this also fixes the deadlock from the "remove possible
deadlock when disconnect" patch in a different way. But the
changes from that patch offer a nice locking cleanup regardless.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210920145502.155454-2-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2021-09-20 16:55:01 +02:00 committed by Greg Kroah-Hartman
parent 54659ca026
commit a7ac783c33
4 changed files with 9 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/staging/rtl8723bs/core/rtw_mlme.c
View file

@ -899,7 +899,6 @@ void rtw_free_assoc_resources(struct adapter *adapter, int lock_scanned_queue)
{
struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
struct wlan_network *tgt_network = &pmlmepriv->cur_network;
struct sta_priv *pstapriv = &adapter->stapriv;
struct dvobj_priv *psdpriv = adapter->dvobj;
struct debug_priv *pdbgpriv = &psdpriv->drv_dbg;
@ -907,11 +906,7 @@ void rtw_free_assoc_resources(struct adapter *adapter, int lock_scanned_queue)
struct sta_info *psta;
psta = rtw_get_stainfo(&adapter->stapriv, tgt_network->network.mac_address);
spin_lock_bh(&(pstapriv->sta_hash_lock));
rtw_free_stainfo(adapter, psta);
spin_unlock_bh(&(pstapriv->sta_hash_lock));
}
if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE|WIFI_ADHOC_MASTER_STATE|WIFI_AP_STATE)) {

4
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
View file

@ -1489,9 +1489,7 @@ unsigned int OnDeAuth(struct adapter *padapter, union recv_frame *precv_frame)
struct sta_info *psta;
struct sta_priv *pstapriv = &padapter->stapriv;
/* spin_lock_bh(&(pstapriv->sta_hash_lock)); */
/* rtw_free_stainfo(padapter, psta); */
/* spin_unlock_bh(&(pstapriv->sta_hash_lock)); */
netdev_dbg(padapter->pnetdev,
"ap recv deauth reason code(%d) sta:%pM\n", reason,
@ -1565,9 +1563,7 @@ unsigned int OnDisassoc(struct adapter *padapter, union recv_frame *precv_frame)
struct sta_info *psta;
struct sta_priv *pstapriv = &padapter->stapriv;
/* spin_lock_bh(&(pstapriv->sta_hash_lock)); */
/* rtw_free_stainfo(padapter, psta); */
/* spin_unlock_bh(&(pstapriv->sta_hash_lock)); */
netdev_dbg(padapter->pnetdev,
"ap recv disassoc reason code(%d) sta:%pM\n",

11
drivers/staging/rtl8723bs/core/rtw_sta_mgt.c
View file

@ -268,7 +268,6 @@ struct sta_info *rtw_alloc_stainfo(struct sta_priv *pstapriv, u8 *hwaddr)
return psta;
}
/* using pstapriv->sta_hash_lock to protect */
u32 rtw_free_stainfo(struct adapter *padapter, struct sta_info *psta)
{
int i;
@ -339,8 +338,10 @@ u32 rtw_free_stainfo(struct adapter *padapter, struct sta_info *psta)
spin_unlock_bh(&pxmitpriv->lock);
spin_lock_bh(&pstapriv->sta_hash_lock);
list_del_init(&psta->hash_list);
pstapriv->asoc_sta_count--;
spin_unlock_bh(&pstapriv->sta_hash_lock);
/* re-init sta_info; 20061114 will be init in alloc_stainfo */
/* _rtw_init_sta_xmit_priv(&psta->sta_xmitpriv); */
@ -435,6 +436,7 @@ void rtw_free_all_stainfo(struct adapter *padapter)
struct sta_info *psta = NULL;
struct sta_priv *pstapriv = &padapter->stapriv;
struct sta_info *pbcmc_stainfo = rtw_get_bcmc_stainfo(padapter);
LIST_HEAD(stainfo_free_list);
if (pstapriv->asoc_sta_count == 1)
return;
@ -447,11 +449,16 @@ void rtw_free_all_stainfo(struct adapter *padapter)
psta = list_entry(plist, struct sta_info, hash_list);
if (pbcmc_stainfo != psta)
rtw_free_stainfo(padapter, psta);
list_move(&psta->hash_list, &stainfo_free_list);
}
}
spin_unlock_bh(&pstapriv->sta_hash_lock);
list_for_each_safe(plist, tmp, &stainfo_free_list) {
psta = list_entry(plist, struct sta_info, hash_list);
rtw_free_stainfo(padapter, psta);
}
}
/* any station allocated can be searched by hash list */

2
drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
View file

@ -821,9 +821,7 @@ static int rtw_add_sta(struct net_device *dev, struct ieee_param *param)
psta = rtw_get_stainfo(pstapriv, param->sta_addr);
if (psta)
{
spin_lock_bh(&(pstapriv->sta_hash_lock));
rtw_free_stainfo(padapter, psta);
spin_unlock_bh(&(pstapriv->sta_hash_lock));
psta = NULL;
}