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authorLarry Finger <Larry.Finger@lwfinger.net>2011-12-17 07:17:16 +0400
committerJohn W. Linville <linville@tuxdriver.com>2011-12-19 23:40:48 +0400
commitb9116b9a2b5db63187d28f99e038f473fad036dc (patch)
tree1bb90f0db702b3ac421ac3174489d2648f1bbc8a /drivers
parentf72ae31e6f0442936c23287d34500fb93b7ac7b8 (diff)
downloadlinux-b9116b9a2b5db63187d28f99e038f473fad036dc.tar.xz
rtlwifi: Fix locking problem introduces with commit 6539306b
When I tested commit 6539306, I did not notice that loading an out-of-tree module turns off lockdep testing in kernel 3.2. For that reason, I missed the kernel WARNING shown below: The solution fixes the warning by partially reverting commit 6539306. [ 84.168146] ------------[ cut here ]------------ [ 84.168155] WARNING: at kernel/mutex.c:198 mutex_lock_nested+0x309/0x310() [ 84.168158] Hardware name: HP Pavilion dv2700 Notebook PC [ 84.168161] Modules linked in: nfs lockd auth_rpcgss nfs_acl sunrpc af_packet cpufreq_conservative cpufreq_userspace cpufreq_powersave powernow_k8 mperf e xt3 jbd ide_cd_mod cdrom snd_hda_codec_conexant arc4 rtl8192ce ide_pci_generic rtl8192c_common rtlwifi snd_hda_intel mac80211 snd_hda_codec snd_pcm snd_timer amd74xx ide_core cfg80211 k8temp snd joydev soundcore hwmon battery forcedeth i2c_nforce2 sg rfkill ac serio_raw snd_page_alloc button video i2c_core ipv6 a utofs4 ext4 mbcache jbd2 crc16 sd_mod ahci ohci_hcd libahci libata scsi_mod ehci_hcd usbcore usb_common fan processor thermal [ 84.168231] Pid: 1218, comm: kworker/u:2 Not tainted 3.2.0-rc5-wl+ #155 [ 84.168234] Call Trace: [ 84.168240] [<ffffffff81048aaa>] warn_slowpath_common+0x7a/0xb0 [ 84.168245] [<ffffffff81048af5>] warn_slowpath_null+0x15/0x20 [ 84.168249] [<ffffffff813811f9>] mutex_lock_nested+0x309/0x310 [ 84.168269] [<ffffffffa00793f9>] ? rtl_ips_nic_on+0x49/0xb0 [rtlwifi] [ 84.168277] [<ffffffffa00793f9>] rtl_ips_nic_on+0x49/0xb0 [rtlwifi] [ 84.168284] [<ffffffffa007ab85>] rtl_pci_tx+0x1b5/0x560 [rtlwifi] [ 84.168291] [<ffffffffa007635a>] rtl_op_tx+0x9a/0xa0 [rtlwifi] [ 84.168359] [<ffffffffa043cf51>] __ieee80211_tx+0x181/0x2b0 [mac80211] [ 84.168375] [<ffffffffa043ef06>] ieee80211_tx+0xf6/0x120 [mac80211] [ 84.168391] [<ffffffffa043ee49>] ? ieee80211_tx+0x39/0x120 [mac80211] [ 84.168408] [<ffffffffa043f80b>] ieee80211_xmit+0xdb/0x100 [mac80211] [ 84.168425] [<ffffffffa043f730>] ? ieee80211_skb_resize.isra.26+0xb0/0xb0 [mac80211] [ 84.168441] [<ffffffffa0440b2a>] ieee80211_tx_skb_tid+0x5a/0x70 [mac80211] [ 84.168458] [<ffffffffa0443da2>] ieee80211_send_auth+0x152/0x1b0 [mac80211] [ 84.168474] [<ffffffffa042e169>] ieee80211_work_work+0x1049/0x1860 [mac80211] [ 84.168489] [<ffffffffa042d120>] ? free_work+0x20/0x20 [mac80211] [ 84.168504] [<ffffffffa042d120>] ? free_work+0x20/0x20 [mac80211] [ 84.168510] [<ffffffff81065ffc>] process_one_work+0x17c/0x530 [ 84.168514] [<ffffffff81065f92>] ? process_one_work+0x112/0x530 [ 84.168519] [<ffffffff81066994>] worker_thread+0x164/0x350 [ 84.168524] [<ffffffff8108420d>] ? trace_hardirqs_on+0xd/0x10 [ 84.168528] [<ffffffff81066830>] ? manage_workers.isra.28+0x220/0x220 [ 84.168533] [<ffffffff8106bc17>] kthread+0x87/0x90 [ 84.168539] [<ffffffff813854b4>] kernel_thread_helper+0x4/0x10 [ 84.168543] [<ffffffff81382bdd>] ? retint_restore_args+0xe/0xe [ 84.168547] [<ffffffff8106bb90>] ? __init_kthread_worker+0x70/0x70 [ 84.168552] [<ffffffff813854b0>] ? gs_change+0xb/0xb [ 84.168554] ---[ end trace f25a4fdc768c028f ]--- Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Cc: Stanislaw Gruska <sgruszka@redhat.com> Cc: Chaoming Li <chaoming_li@realsil.com.cn> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/rtlwifi/base.c1
-rw-r--r--drivers/net/wireless/rtlwifi/ps.c5
-rw-r--r--drivers/net/wireless/rtlwifi/wifi.h1
3 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/wireless/rtlwifi/base.c b/drivers/net/wireless/rtlwifi/base.c
index d81a6021a30f..7c1d82d8d71c 100644
--- a/drivers/net/wireless/rtlwifi/base.c
+++ b/drivers/net/wireless/rtlwifi/base.c
@@ -449,6 +449,7 @@ int rtl_init_core(struct ieee80211_hw *hw)
/* <4> locks */
mutex_init(&rtlpriv->locks.conf_mutex);
mutex_init(&rtlpriv->locks.ps_mutex);
+ spin_lock_init(&rtlpriv->locks.ips_lock);
spin_lock_init(&rtlpriv->locks.irq_th_lock);
spin_lock_init(&rtlpriv->locks.h2c_lock);
spin_lock_init(&rtlpriv->locks.rf_ps_lock);
diff --git a/drivers/net/wireless/rtlwifi/ps.c b/drivers/net/wireless/rtlwifi/ps.c
index a14a68b24635..130fdd99d573 100644
--- a/drivers/net/wireless/rtlwifi/ps.c
+++ b/drivers/net/wireless/rtlwifi/ps.c
@@ -237,11 +237,12 @@ void rtl_ips_nic_on(struct ieee80211_hw *hw)
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
enum rf_pwrstate rtstate;
+ unsigned long flags;
if (mac->opmode != NL80211_IFTYPE_STATION)
return;
- mutex_lock(&rtlpriv->locks.ps_mutex);
+ spin_lock_irqsave(&rtlpriv->locks.ips_lock, flags);
if (ppsc->inactiveps) {
rtstate = ppsc->rfpwr_state;
@@ -257,7 +258,7 @@ void rtl_ips_nic_on(struct ieee80211_hw *hw)
}
}
- mutex_unlock(&rtlpriv->locks.ps_mutex);
+ spin_unlock_irqrestore(&rtlpriv->locks.ips_lock, flags);
}
/*for FW LPS*/
diff --git a/drivers/net/wireless/rtlwifi/wifi.h b/drivers/net/wireless/rtlwifi/wifi.h
index 085dccdbd1b6..115969df0c9e 100644
--- a/drivers/net/wireless/rtlwifi/wifi.h
+++ b/drivers/net/wireless/rtlwifi/wifi.h
@@ -1547,6 +1547,7 @@ struct rtl_locks {
struct mutex ps_mutex;
/*spin lock */
+ spinlock_t ips_lock;
spinlock_t irq_th_lock;
spinlock_t h2c_lock;
spinlock_t rf_ps_lock;