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	Mon, 18 Mar 2013 15:15:40 -0400
Date: Mon, 18 Mar 2013 15:13:41 -0400
From: "John W. Linville" <linville@tuxdriver.com>
To: Parag Warudkar <parag.lkml@gmail.com>
Cc: "Luis R. Rodriguez" <mcgrof@qca.qualcomm.com>,
	Jouni Malinen <jouni@qca.qualcomm.com>,
	Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>,
	linux-wireless@vger.kernel.org, ath9k-devel@venema.h4ckr.net,
	netdev@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	senthilb@qca.qualcomm.com
Subject: Re: [PATCH] ath9k : Fix ieee80211 work while going to suspend
Message-ID: <20130318191340.GA28919@tuxdriver.com> (sfid-20130318_201604_625534_61DC3517)
References: <CAOULuOb0_40EX+6A_HM8eJN7kj9J4WhO9UhZbUUqng1Sfy_SQg@mail.gmail.com>
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Any comments from the ath9k folks?

On Sat, Mar 16, 2013 at 12:38:14PM -0400, Parag Warudkar wrote:
> During suspend below warning is seen when ath9k is active.  Attached
> patch fixes the warning for me. Tested to work across few
> suspend-resume cycles.
> 
> 
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642939] WARNING: at
> net/mac80211/util.c:599 ieee80211_can_queue_work.isra.7+0x32/0x40
> [mac80211]()
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642940] Hardware name: iMac12,1
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642941] queueing ieee80211
> work while going to suspend
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642972] Modules linked in:
> joydev hid_logitech_dj zfs(POF) bridge stp llc zunicode(POF) zavl(POF)
> zcommon(POF) znvpair(POF) spl(OF) zlib_deflate be2iscsi
> iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i cxgb3 mdio
> libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core
> iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi rfcomm bnep
> nls_utf8 hfsplus btusb uvcvideo videobuf2_vmalloc videobuf2_memops
> videobuf2_core videodev bluetooth media coretemp snd_hda_codec_hdmi
> snd_hda_codec_cirrus snd_hda_intel snd_hda_codec snd_hwdep snd_seq
> snd_seq_device snd_pcm snd_page_alloc snd_timer snd soundcore arc4
> ath9k ath9k_common microcode ath9k_hw ath mac80211 iTCO_wdt
> iTCO_vendor_support cfg80211 lpc_ich mei mfd_core rfkill i2c_i801
> applesmc apple_bl input_polldev vhost_net tun macvtap macvlan
> kvm_intel kvm binfmt_misc uinput usb_storage crc32c_intel radeon ttm
> i915 ghash_clmulni_intel firewire_ohci firewire_core i2c_algo_bit
> drm_kms_helper crc_itu_t drm tg3 ptp pps_core i2c_core video sunrpc
> [last unloaded: iptable_mangle]
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642985] Pid: 0, comm:
> swapper/0 Tainted: PF          O 3.8.2-206.fc18.x86_64 #1
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642986] Call Trace:
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642992]  <IRQ>
> [<ffffffff8105e61f>] warn_slowpath_common+0x7f/0xc0
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643009]
> [<ffffffffa0581420>] ? ath_start_rx_poll+0x70/0x70 [ath9k]
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643011]
> [<ffffffff8105e716>] warn_slowpath_fmt+0x46/0x50
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643018]
> [<ffffffffa045b542>] ieee80211_can_queue_work.isra.7+0x32/0x40
> [mac80211]
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643024]
> [<ffffffffa045b5de>] ieee80211_queue_work+0x2e/0x50 [mac80211]
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643027]
> [<ffffffffa0581438>] ath_rx_poll+0x18/0x20 [ath9k]
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643029]
> [<ffffffff8106d0aa>] call_timer_fn+0x3a/0x120
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643032]
> [<ffffffffa0581420>] ? ath_start_rx_poll+0x70/0x70 [ath9k]
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643034]
> [<ffffffff814fb240>] ? cpufreq_p4_target+0x120/0x120
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643035]
> [<ffffffff8106ee3e>] run_timer_softirq+0x1fe/0x2b0
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643037]
> [<ffffffff814fb240>] ? cpufreq_p4_target+0x120/0x120
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643038]
> [<ffffffff81066cd0>] __do_softirq+0xd0/0x210
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643040]
> [<ffffffff8101b913>] ? native_sched_clock+0x13/0x80
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643041]
> [<ffffffff814fb240>] ? cpufreq_p4_target+0x120/0x120
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643043]
> [<ffffffff8165985c>] call_softirq+0x1c/0x30
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643045]
> [<ffffffff810162a5>] do_softirq+0x75/0xb0
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643046]
> [<ffffffff81066fa5>] irq_exit+0xb5/0xc0
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643048]
> [<ffffffff8165a1de>] smp_apic_timer_interrupt+0x6e/0x99
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643049]
> [<ffffffff8165911d>] apic_timer_interrupt+0x6d/0x80
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643052]  <EOI>
> [<ffffffff810868ce>] ? __hrtimer_start_range_ns+0x1be/0x400
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643053]
> [<ffffffff814fbc30>] ? cpuidle_wrap_enter+0x50/0xa0
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643054]
> [<ffffffff814fbc29>] ? cpuidle_wrap_enter+0x49/0xa0
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643056]
> [<ffffffff814fbc90>] cpuidle_enter_tk+0x10/0x20
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643057]
> [<ffffffff814fb8c9>] cpuidle_idle_call+0xa9/0x260
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643058]
> [<ffffffff8101d45f>] cpu_idle+0xaf/0x120
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643061]
> [<ffffffff81634522>] rest_init+0x72/0x80
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643063]
> [<ffffffff81d00c40>] start_kernel+0x3d1/0x3de
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643065]
> [<ffffffff81d0066e>] ? repair_env_string+0x5e/0x5e
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643066]
> [<ffffffff81d00356>] x86_64_start_reservations+0x131/0x135
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643068]
> [<ffffffff81d0045a>] x86_64_start_kernel+0x100/0x10f
> Mar 16 09:39:17 Parags-iMac kernel: [ 3993.643068] ---[ end trace
> 5595a7f5dd9a2949 ]---
> 
> Signed-off-by: Parag Warudkar <parag.lkml@gmail.com>
> 
> diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h
> b/drivers/net/wireless/ath/ath9k/ath9k.h
> index a56b241..b3088a1 100644
> --- a/drivers/net/wireless/ath/ath9k/ath9k.h
> +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
> @@ -764,6 +764,7 @@ struct ath_softc {
>   atomic_t wow_got_bmiss_intr;
>   atomic_t wow_sleep_proc_intr; /* in the middle of WoW sleep ? */
>   u32 wow_intr_before_sleep;
> + bool suspending;
>  #endif
>  };
> 
> diff --git a/drivers/net/wireless/ath/ath9k/link.c
> b/drivers/net/wireless/ath/ath9k/link.c
> index ade3afb..fa77e19 100644
> --- a/drivers/net/wireless/ath/ath9k/link.c
> +++ b/drivers/net/wireless/ath/ath9k/link.c
> @@ -158,7 +158,8 @@ void ath_start_rx_poll(struct ath_softc *sc, u8 nbeacon)
>  {
>   if (!AR_SREV_9300(sc->sc_ah))
>   return;
> -
> + if (sc->suspending)
> + return;
>   if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
>   return;
> 
> diff --git a/drivers/net/wireless/ath/ath9k/main.c
> b/drivers/net/wireless/ath/ath9k/main.c
> index 6e66f9c..0cf88b7 100644
> --- a/drivers/net/wireless/ath/ath9k/main.c
> +++ b/drivers/net/wireless/ath/ath9k/main.c
> @@ -2150,7 +2150,7 @@ static int ath9k_suspend(struct ieee80211_hw *hw,
>   int ret = 0;
> 
>   mutex_lock(&sc->mutex);
> -
> + sc->suspending = 1;
>   ath_cancel_work(sc);
>   ath_stop_ani(sc);
>   del_timer_sync(&sc->rx_poll_timer);
> @@ -2288,6 +2288,7 @@ static int ath9k_resume(struct ieee80211_hw *hw)
>   ath9k_start_btcoex(sc);
> 
>   ath9k_ps_restore(sc);
> + sc->suspending = 0;
>   mutex_unlock(&sc->mutex);
> 
>   return 0;



-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.