Subject: Re: [PATCH] rtlwifi: Add more checks for get_btc_status callback

From: Larry Finger <[email-masked]>
Date: Wed, 29 Oct 2014 23:30:08 -0500

On 10/29/2014 06:28 PM, Murilo Opsfelder Araujo wrote:
> This is a complement of commit 08054200117a95afc14c3d2ed3a38bf4e345bf78
> "rtlwifi: Add check for get_btc_status callback".
>
> With this patch, next-20141029 at least does not panic with rtl8192se
> device.
>

This patch is OK, but as noted it is not complete.

I have patches to fix all the kernel panics for rtl8192se AND rtl8192ce. There 
are missing parts, but I would prefer submitting mine, which would conflict with 
this one. For that reason, NACK for this one, and please apply the set I am 
submitting now.

Larry

> Signed-off-by: Murilo Opsfelder Araujo <[email-masked]>
> ---
>
> Hello, everyone.
>
> Some days ago, I reported [1] that next-20140930 introduced an issue
> with rtl8192se devices.
>
> Later on, Larry Finger proposed [2] a fix that did not solve the
> problem thoroughly.
>
> This patch is based on Larry's one [3].  It also does not solve the
> rtl8192se issue completely but I can at least boot next-20141029
> without a panic.
>
> The remaining issue is that the rtl8192se device does not associate.
> It does not even show any wifi network available.  The device is shown
> by iwconfig, but I cannot do anything with it.
>
> I need help from someone out there that could provide me guidance or
> possibly investigate the issue (I'm not a kernel expert yet).
>
> I'd not like to see this regression landing on v3.18.
>
> [1] http://marc.info/?l=linux-wireless&m=141403434929612
> [2] http://marc.info/?l=linux-wireless&m=141408165513255
> [3] http://marc.info/?l=linux-wireless&m=141416876810127
>
>   drivers/net/wireless/rtlwifi/base.c |  6 ++++--
>   drivers/net/wireless/rtlwifi/core.c |  9 ++++++---
>   drivers/net/wireless/rtlwifi/pci.c  |  3 ++-
>   drivers/net/wireless/rtlwifi/ps.c   | 12 ++++++++----
>   4 files changed, 20 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/wireless/rtlwifi/base.c b/drivers/net/wireless/rtlwifi/base.c
> index 40b6d1d..1a51577 100644
> --- a/drivers/net/wireless/rtlwifi/base.c
> +++ b/drivers/net/wireless/rtlwifi/base.c
> @@ -1234,7 +1234,8 @@ EXPORT_SYMBOL_GPL(rtl_action_proc);
>   static void setup_arp_tx(struct rtl_priv *rtlpriv, struct rtl_ps_ctl *ppsc)
>   {
>   	rtlpriv->ra.is_special_data = true;
> -	if (rtlpriv->cfg->ops->get_btc_status())
> +	if (rtlpriv->cfg->ops->get_btc_status &&
> +	    rtlpriv->cfg->ops->get_btc_status())
>   		rtlpriv->btcoexist.btc_ops->btc_special_packet_notify(
>   					rtlpriv, 1);
>   	rtlpriv->enter_ps = false;
> @@ -1629,7 +1630,8 @@ void rtl_watchdog_wq_callback(void *data)
>   		}
>   	}
>
> -	if (rtlpriv->cfg->ops->get_btc_status())
> +	if (rtlpriv->cfg->ops->get_btc_status &&
> +	    rtlpriv->cfg->ops->get_btc_status())
>   		rtlpriv->btcoexist.btc_ops->btc_periodical(rtlpriv);
>
>   	rtlpriv->link_info.bcn_rx_inperiod = 0;
> diff --git a/drivers/net/wireless/rtlwifi/core.c b/drivers/net/wireless/rtlwifi/core.c
> index f6179bc..686d256 100644
> --- a/drivers/net/wireless/rtlwifi/core.c
> +++ b/drivers/net/wireless/rtlwifi/core.c
> @@ -1133,7 +1133,8 @@ static void rtl_op_bss_info_changed(struct ieee80211_hw *hw,
>   		ppsc->report_linked = (mstatus == RT_MEDIA_CONNECT) ?
>   				      true : false;
>
> -		if (rtlpriv->cfg->ops->get_btc_status())
> +		if (rtlpriv->cfg->ops->get_btc_status &&
> +		    rtlpriv->cfg->ops->get_btc_status())
>   			rtlpriv->btcoexist.btc_ops->btc_mediastatus_notify(
>   							rtlpriv, mstatus);
>   	}
> @@ -1373,7 +1374,8 @@ static void rtl_op_sw_scan_start(struct ieee80211_hw *hw)
>   		return;
>   	}
>
> -	if (rtlpriv->cfg->ops->get_btc_status())
> +	if (rtlpriv->cfg->ops->get_btc_status &&
> +	    rtlpriv->cfg->ops->get_btc_status())
>   		rtlpriv->btcoexist.btc_ops->btc_scan_notify(rtlpriv, 1);
>
>   	if (rtlpriv->dm.supp_phymode_switch) {
> @@ -1425,7 +1427,8 @@ static void rtl_op_sw_scan_complete(struct ieee80211_hw *hw)
>   	}
>
>   	rtlpriv->cfg->ops->scan_operation_backup(hw, SCAN_OPT_RESTORE);
> -	if (rtlpriv->cfg->ops->get_btc_status())
> +	if (rtlpriv->cfg->ops->get_btc_status &&
> +	    rtlpriv->cfg->ops->get_btc_status())
>   		rtlpriv->btcoexist.btc_ops->btc_scan_notify(rtlpriv, 0);
>   }
>
> diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c
> index 25daa87..ed3364d 100644
> --- a/drivers/net/wireless/rtlwifi/pci.c
> +++ b/drivers/net/wireless/rtlwifi/pci.c
> @@ -1833,7 +1833,8 @@ static void rtl_pci_stop(struct ieee80211_hw *hw)
>   	unsigned long flags;
>   	u8 RFInProgressTimeOut = 0;
>
> -	if (rtlpriv->cfg->ops->get_btc_status())
> +	if (rtlpriv->cfg->ops->get_btc_status &&
> +	    rtlpriv->cfg->ops->get_btc_status())
>   		rtlpriv->btcoexist.btc_ops->btc_halt_notify();
>
>   	/*
> diff --git a/drivers/net/wireless/rtlwifi/ps.c b/drivers/net/wireless/rtlwifi/ps.c
> index b69321d..2278af9 100644
> --- a/drivers/net/wireless/rtlwifi/ps.c
> +++ b/drivers/net/wireless/rtlwifi/ps.c
> @@ -261,7 +261,8 @@ void rtl_ips_nic_off_wq_callback(void *data)
>   			ppsc->in_powersavemode = true;
>
>   			/* call before RF off */
> -			if (rtlpriv->cfg->ops->get_btc_status())
> +			if (rtlpriv->cfg->ops->get_btc_status &&
> +			    rtlpriv->cfg->ops->get_btc_status())
>   				rtlpriv->btcoexist.btc_ops->btc_ips_notify(rtlpriv,
>   									ppsc->inactive_pwrstate);
>
> @@ -306,7 +307,8 @@ void rtl_ips_nic_on(struct ieee80211_hw *hw)
>   			ppsc->in_powersavemode = false;
>   			_rtl_ps_inactive_ps(hw);
>   			/* call after RF on */
> -			if (rtlpriv->cfg->ops->get_btc_status())
> +			if (rtlpriv->cfg->ops->get_btc_status &&
> +			    rtlpriv->cfg->ops->get_btc_status())
>   				rtlpriv->btcoexist.btc_ops->btc_ips_notify(rtlpriv,
>   									ppsc->inactive_pwrstate);
>   		}
> @@ -390,14 +392,16 @@ void rtl_lps_set_psmode(struct ieee80211_hw *hw, u8 rt_psmode)
>   			if (ppsc->p2p_ps_info.opp_ps)
>   				rtl_p2p_ps_cmd(hw , P2P_PS_ENABLE);
>
> -			if (rtlpriv->cfg->ops->get_btc_status())
> +			if (rtlpriv->cfg->ops->get_btc_status &&
> +			    rtlpriv->cfg->ops->get_btc_status())
>   				rtlpriv->btcoexist.btc_ops->btc_lps_notify(rtlpriv, rt_psmode);
>   		} else {
>   			if (rtl_get_fwlps_doze(hw)) {
>   				RT_TRACE(rtlpriv, COMP_RF, DBG_DMESG,
>   					 "FW LPS enter ps_mode:%x\n",
>   					 ppsc->fwctrl_psmode);
> -				if (rtlpriv->cfg->ops->get_btc_status())
> +				if (rtlpriv->cfg->ops->get_btc_status &&
> +				    rtlpriv->cfg->ops->get_btc_status())
>   					rtlpriv->btcoexist.btc_ops->btc_lps_notify(rtlpriv, rt_psmode);
>   				enter_fwlps = true;
>   				ppsc->pwr_mode = ppsc->fwctrl_psmode;
> --
> 2.1.2
>