Re: [PATCH rtw-next v4 2/4] wifi: rtw88: sdio: Track running state and cancel TX worker on stop

["Luka Gejak" <luka.gejak@linux.dev>]

October 6, 2026 at 04:03, "Ping-Ke Shih" <pkshih@realtek.com mailto:pkshih@realtek.com?to=%22Ping-Ke%20Shih%22%20%3Cpkshih%40realtek.com%3E > wrote:


> 
> Alastair D'Silva <alastair@d-silva.org> wrote:
> 
> > 
> > When rtw_sdio_stop() disables interrupts, in-flight interrupt handlers or
> >  delayed TX work may still run against a powered-down device.
> >  
> >  Track the operational state in rtwsdio->running (similar to PCI), check it
> >  at the entry of rtw_sdio_handle_interrupt() and rtw_sdio_tx_handler(), and
> >  cancel the TX worker synchronously in rtw_sdio_stop().
> >  
> >  Fixes: 65371a3f14e7 ("wifi: rtw88: sdio: Add HCI implementation for SDIO based chipsets")
> >  Cc: stable@vger.kernel.org
> >  Assisted-by: LLM
> >  Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> >  ---
> >  drivers/net/wireless/realtek/rtw88/sdio.c | 12 ++++++++++++
> >  drivers/net/wireless/realtek/rtw88/sdio.h | 1 +
> >  2 files changed, 13 insertions(+)
> >  
> >  diff --git a/drivers/net/wireless/realtek/rtw88/sdio.c b/drivers/net/wireless/realtek/rtw88/sdio.c
> >  index e39284b71837..d2f4d7e8bc83 100644
> >  --- a/drivers/net/wireless/realtek/rtw88/sdio.c
> >  +++ b/drivers/net/wireless/realtek/rtw88/sdio.c
> >  @@ -1054,6 +1054,7 @@ static int rtw_sdio_8723bs_check_rqpn(struct rtw_dev *rtwdev)
> >  
> >  static int rtw_sdio_start(struct rtw_dev *rtwdev)
> >  {
> >  + struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
> >  u32 clear;
> >  
> >  if (rtw_is_8723bs(rtwdev)) {
> >  @@ -1075,6 +1076,7 @@ static int rtw_sdio_start(struct rtw_dev *rtwdev)
> >  rtw_write32(rtwdev, REG_SDIO_HISR, clear);
> >  }
> >  
> >  + rtwsdio->running = true;
> > 
> Is there existing race between start/stop/interrupt? Need a lock?
> 
> > 
> > rtw_sdio_enable_interrupt(rtwdev);
> >  
> >  return 0;
> >  @@ -1082,7 +1084,11 @@ static int rtw_sdio_start(struct rtw_dev *rtwdev)
> >  
> >  static void rtw_sdio_stop(struct rtw_dev *rtwdev)
> >  {
> >  + struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
> >  +
> >  + rtwsdio->running = false;
> >  rtw_sdio_disable_interrupt(rtwdev);
> >  + cancel_delayed_work_sync(&rtwsdio->tx_handler_data->work);
> > 
> I think this is the major statement added by this patch, but I'm not sure
> if this is actually needed. (Maybe, Luka can help this)
> 

I will take a look at this series later during the day.

> By 'git blame', the work is added by
> 28eaf7971a20 ("wifi: rtw88: sdio: add TX back-pressure and retry on page starvation")
> 
> Maybe, the fixes tag should be 28eaf7971a20. I think there is no way to apply this
> to 65371a3f14e7 (your fixes tag)
> 
>

Best regards,
Luka Gejak