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Date:   Tue, 27 Oct 2020 01:48:39 +0000
From:   Pkshih <pkshih@...ltek.com>
To:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "kvalo@...eaurora.org" <kvalo@...eaurora.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "WeitaoWang-oc@...oxin.com" <WeitaoWang-oc@...oxin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "CobeChen@...oxin.com" <CobeChen@...oxin.com>,
        "tonywwang@...oxin.com" <tonywwang@...oxin.com>,
        "weitaowang@...oxin.com" <weitaowang@...oxin.com>,
        "TimGuo@...oxin.com" <TimGuo@...oxin.com>,
        "wwt8723@....com" <wwt8723@....com>
Subject: Re: [PATCH] Net/Usb:Fix realtek wireless NIC non-canonical address access issues

On Tue, 2020-10-20 at 19:38 +0800, WeitaoWangoc wrote:

For rtlwifi driver, please use 'rtlwifi: ' as prefix of mail subject, like
"rtlwifi: Fix non-canonical address access issues"

> During realtek USB wireless NIC initialization, it's unexpected
> disconnection will cause urb sumbmit fail.On the one hand,

nit: add space right after period, like "... fail. On the one hand ..."

> _rtl_usb_cleanup_rx will be called to clean up rx stuff, especially
> for rtl_wq. On the other hand, disconnection will cause rtl_usb_disconnect
> and _rtl_usb_cleanup_rx to be called.Finnally,rtl_wq will be flush/destroy
> twice,which will cause non-canonical address 0xdead000000000122 access and
> general protection fault.
> 
> Fixed this issue by remove _rtl_usb_cleanup_rx when urb sumbmit fail.
> 
> Signed-off-by: WeitaoWangoc <WeitaoWang-oc@...oxin.com>
> ---
>  drivers/net/wireless/realtek/rtlwifi/usb.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c
> b/drivers/net/wireless/realtek/rtlwifi/usb.c
> index 06e073d..d62b87f 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/usb.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
> @@ -731,7 +731,6 @@ static int _rtl_usb_receive(struct ieee80211_hw *hw)
>  
>  err_out:
>  	usb_kill_anchored_urbs(&rtlusb->rx_submitted);
> -	_rtl_usb_cleanup_rx(hw);
>  	return err;
>  }
>  

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