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rtlwifi: rtl8192cu: Fix deadlock 

Prevent code from calling itself indirectly, causing the driver to hang
and consume 100% CPU.

Without this fix, the following script can bring down a single CPU
system:
```
while true; do
  rmmod rtl8192cu
  modprobe rtl8192cu
done
```

Signed-off-by: Reto Schneider <code@reto-schneider.ch>
ACKed-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200622132113.14508-2-code@reto-schneider.ch
This commit is contained in:
Reto Schneider 2020-06-22 15:21:11 +02:00 committed by Kalle Valo
parent f8279dad4e
commit ec89032cd1
1 changed files with 4 additions and 2 deletions
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6
drivers/net/wireless/realtek/rtlwifi/usb.c
View File

@ -680,8 +680,10 @@ static void _rtl_usb_cleanup_rx(struct ieee80211_hw *hw)
tasklet_kill(&rtlusb->rx_work_tasklet);
cancel_work_sync(&rtlpriv->works.lps_change_work);
flush_workqueue(rtlpriv->works.rtl_wq);
destroy_workqueue(rtlpriv->works.rtl_wq);
if (rtlpriv->works.rtl_wq) {
destroy_workqueue(rtlpriv->works.rtl_wq);
rtlpriv->works.rtl_wq = NULL;
}
skb_queue_purge(&rtlusb->rx_queue);