drivers: staging: rtl8723bs: Fix locking in rtw_scan_timeout_handler()

[ Upstream commit 3f467036093fedd7e231924327455fc609b5ef02 ]

Commit cc7ad0d77b51 ("drivers: staging: rtl8723bs: Fix deadlock in
rtw_surveydone_event_callback()") besides fixing the deadlock also
modified rtw_scan_timeout_handler() to use spin_[un]lock_irq()
instead of spin_[un]lock_bh().

Disabling the IRQs is not necessary since all code taking this lock
runs from either user contexts or from softirqs

rtw_scan_timeout_handler() is the only function taking pmlmepriv->lock
which uses spin_[un]lock_irq() for this. Switch back to
spin_[un]lock_bh() to make it consistent with the rest of the code.

Fixes: cc7ad0d77b51 ("drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()")
Cc: Duoming Zhou <duoming@zju.edu.cn>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230221145326.7808-2-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme.c b/drivers/staging/rtl8723bs/core/rtw_mlme.c
index 9f4f032..8159bb6 100644 (file)
--- a/drivers/staging/rtl8723bs/core/rtw_mlme.c
+++ b/drivers/staging/rtl8723bs/core/rtw_mlme.c
@@ -1590,11 +1590,11 @@ void rtw_scan_timeout_handler(struct timer_list *t)
                                                  mlmepriv.scan_to_timer);
        struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 
-       spin_lock_irq(&pmlmepriv->lock);
+       spin_lock_bh(&pmlmepriv->lock);
 
        _clr_fwstate_(pmlmepriv, _FW_UNDER_SURVEY);
 
-       spin_unlock_irq(&pmlmepriv->lock);
+       spin_unlock_bh(&pmlmepriv->lock);
 
        rtw_indicate_scan_done(adapter, true);
 }