[PATCH v2 3/3] rtl8188eu: Fix a possible sleep-in-atomic bug in _rtw_pwr_wakeup

[Jia-Ju Bai]

The driver may sleep under a spinlock, and the function call path is:
rtw_set_802_11_disassociate(acquire the spinlock)
  _rtw_pwr_wakeup
    usleep_range --> may sleep

To fix it, usleep_range is replaced with udelay.
This bug is found by my static analysis tool and my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx>
---
 drivers/staging/rtl8188eu/core/rtw_pwrctrl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_pwrctrl.c b/drivers/staging/rtl8188eu/core/rtw_pwrctrl.c
index f86c9ce..2913661 100644
--- a/drivers/staging/rtl8188eu/core/rtw_pwrctrl.c
+++ b/drivers/staging/rtl8188eu/core/rtw_pwrctrl.c
@@ -569,7 +569,7 @@ int _rtw_pwr_wakeup(struct adapter *padapter, u32 ips_deffer_ms, const char *cal
 		DBG_88E("%s wait ps_processing...\n", __func__);
 		while (pwrpriv->ps_processing &&
 		       jiffies_to_msecs(jiffies - start) <= 3000)
-			usleep_range(1000, 3000);
+			udelay(1500);
 		if (pwrpriv->ps_processing)
 			DBG_88E("%s wait ps_processing timeout\n", __func__);
 		else
-- 
1.7.9.5