staging: rtl8723au: Do not write garbage to REG_SPS0_CTRL

Use a separate variable to hold the value of REG_SPS0_CTRL to avoid it
getting clobbered and writing out garbage to it, for the case of
eRFPowerState == rf_sleep/rf_off && bRegSSPwrLvl == 1.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 10 deletions

diff --git a/drivers/staging/rtl8723au/hal/usb_halinit.c b/drivers/staging/rtl8723au/hal/usb_halinit.c
index 762c51427958..6c6601332035 100644
--- a/drivers/staging/rtl8723au/hal/usb_halinit.c
+++ b/drivers/staging/rtl8723au/hal/usb_halinit.c
@@ -776,9 +776,11 @@ static void phy_SsPwrSwitch92CU(struct rtw_adapter *Adapter,
                                 int bRegSSPwrLvl)
 {
         struct hal_data_8723a *pHalData = GET_HAL_DATA(Adapter);
-        u8 value8;
+        u8 value8, sps0;
         u8 bytetmp;
 
+        sps0 = rtl8723au_read8(Adapter, REG_SPS0_CTRL);
+
         switch (eRFPowerState) {
         case rf_on:
                 if (bRegSSPwrLvl == 1) {
@@ -788,8 +790,7 @@ static void phy_SsPwrSwitch92CU(struct rtw_adapter *Adapter,
 
                         /*  2. Force PWM, Enable SPS18_LDO_Marco_Block */
                         rtl8723au_write8(Adapter, REG_SPS0_CTRL,
-                                         rtl8723au_read8(Adapter, REG_SPS0_CTRL) |
-                                         BIT(0) | BIT(3));
+                                         sps0 | BIT(0) | BIT(3));
 
                         /*  3. restore BB, AFE control register. */
                         /* RF */
@@ -832,8 +833,7 @@ static void phy_SsPwrSwitch92CU(struct rtw_adapter *Adapter,
 
                         /*  2. Force PWM, Enable SPS18_LDO_Marco_Block */
                         rtl8723au_write8(Adapter, REG_SPS0_CTRL,
-                                         rtl8723au_read8(Adapter, REG_SPS0_CTRL) |
-                                         BIT(0) | BIT(3));
+                                         sps0 | BIT(0) | BIT(3));
 
                         /*  3. restore BB, AFE control register. */
                         /* RF */
@@ -882,11 +882,10 @@ static void phy_SsPwrSwitch92CU(struct rtw_adapter *Adapter,
                 break;
         case rf_sleep:
         case rf_off:
-                value8 = rtl8723au_read8(Adapter, REG_SPS0_CTRL);
                 if (IS_81xxC_VENDOR_UMC_B_CUT(pHalData->VersionID))
-                        value8 &= ~BIT(0);
+                        sps0 &= ~BIT(0);
                 else
-                        value8 &= ~(BIT(0) | BIT(3));
+                        sps0 &= ~(BIT(0) | BIT(3));
                 if (bRegSSPwrLvl == 1) {
                         RT_TRACE(_module_hal_init_c_, _drv_err_, ("SS LVL1\n"));
                         /*  Disable RF and BB only for SelectSuspend. */
@@ -936,7 +935,7 @@ static void phy_SsPwrSwitch92CU(struct rtw_adapter *Adapter,
                                              bRFRegOffsetMask, 0);
 
                         /*  4. Force PFM , disable SPS18_LDO_Marco_Block */
-                        rtl8723au_write8(Adapter, REG_SPS0_CTRL, value8);
+                        rtl8723au_write8(Adapter, REG_SPS0_CTRL, sps0);
                 } else {        /*  Level 2 or others. */
                         RT_TRACE(_module_hal_init_c_, _drv_err_, ("SS LVL2\n"));
                         {
@@ -1009,7 +1008,7 @@ static void phy_SsPwrSwitch92CU(struct rtw_adapter *Adapter,
                                              bRFRegOffsetMask, 0);
 
                         /*  4. Force PFM , disable SPS18_LDO_Marco_Block */
-                        rtl8723au_write8(Adapter, REG_SPS0_CTRL, value8);
+                        rtl8723au_write8(Adapter, REG_SPS0_CTRL, sps0);
 
                         /*  2010/10/13 MH/Isaachsu exchange sequence. */
                         /* h.   AFE_PLL_CTRL 0x28[7:0] = 0x80