ath9k: remove ah->mask_reg, it's never used properly

ah->mask_reg was used to hold different data throughout the driver.
ath9k_hw_init_interrupt_masks() used it to save the value written to
AR_IMR.  ath9k_hw_set_interrupts() used it to hold the interrupt mask as
defined in enum ath9k_int.  Those masks differ in many bits.

Use ah->imask instead of ah->mask_reg in ath9k_hw_set_interrupts() and
ath9k_hw_updatetxtriglevel().  That's what the code was meant to do.
ah->imask is initialized in ath9k_start(), so we don't need to
initialize it from ah->mask_reg.

Once it's done, ah->mask_reg becomes write-only, so it's replaced with a
local variable in ath9k_hw_init_interrupt_masks().

Signed-off-by: Pavel Roskin <proski@gnu.org>
Reported-by: Julia Lawall <julia@diku.dk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 8 insertions, 10 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 77db932c3137..e716b600dec5 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1120,23 +1120,23 @@ static void ath9k_hw_init_chain_masks(struct ath_hw *ah)
 static void ath9k_hw_init_interrupt_masks(struct ath_hw *ah,
                                           enum nl80211_iftype opmode)
 {
-        ah->mask_reg = AR_IMR_TXERR |
+        u32 imr_reg = AR_IMR_TXERR |
                 AR_IMR_TXURN |
                 AR_IMR_RXERR |
                 AR_IMR_RXORN |
                 AR_IMR_BCNMISC;
 
         if (ah->config.rx_intr_mitigation)
-                ah->mask_reg |= AR_IMR_RXINTM | AR_IMR_RXMINTR;
+                imr_reg |= AR_IMR_RXINTM | AR_IMR_RXMINTR;
         else
-                ah->mask_reg |= AR_IMR_RXOK;
+                imr_reg |= AR_IMR_RXOK;
 
-        ah->mask_reg |= AR_IMR_TXOK;
+        imr_reg |= AR_IMR_TXOK;
 
         if (opmode == NL80211_IFTYPE_AP)
-                ah->mask_reg |= AR_IMR_MIB;
+                imr_reg |= AR_IMR_MIB;
 
-        REG_WRITE(ah, AR_IMR, ah->mask_reg);
+        REG_WRITE(ah, AR_IMR, imr_reg);
         ah->imrs2_reg |= AR_IMR_S2_GTT;
         REG_WRITE(ah, AR_IMR_S2, ah->imrs2_reg);
 
@@ -2839,7 +2839,7 @@ EXPORT_SYMBOL(ath9k_hw_getisr);
 
 enum ath9k_int ath9k_hw_set_interrupts(struct ath_hw *ah, enum ath9k_int ints)
 {
-        u32 omask = ah->mask_reg;
+        enum ath9k_int omask = ah->imask;
         u32 mask, mask2;
         struct ath9k_hw_capabilities *pCap = &ah->caps;
         struct ath_common *common = ath9k_hw_common(ah);
@@ -2911,7 +2911,6 @@ enum ath9k_int ath9k_hw_set_interrupts(struct ath_hw *ah, enum ath9k_int ints)
                            AR_IMR_S2_TSFOOR | AR_IMR_S2_GTT | AR_IMR_S2_CST);
         ah->imrs2_reg |= mask2;
         REG_WRITE(ah, AR_IMR_S2, ah->imrs2_reg);
-        ah->mask_reg = ints;
 
         if (!(pCap->hw_caps & ATH9K_HW_CAP_AUTOSLEEP)) {
                 if (ints & ATH9K_INT_TIM_TIMER)
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 0ac7a80be082..97ebeba8a157 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -479,7 +479,6 @@ struct ath_hw {
 
         int16_t curchan_rad_index;
         enum ath9k_int imask;
-        u32 mask_reg;
         u32 imrs2_reg;
         u32 txok_interrupt_mask;
         u32 txerr_interrupt_mask;
diff --git a/drivers/net/wireless/ath/ath9k/mac.c b/drivers/net/wireless/ath/ath9k/mac.c
index e020b82a677e..4a2060e5a777 100644
--- a/drivers/net/wireless/ath/ath9k/mac.c
+++ b/drivers/net/wireless/ath/ath9k/mac.c
@@ -105,7 +105,7 @@ bool ath9k_hw_updatetxtriglevel(struct ath_hw *ah, bool bIncTrigLevel)
         if (ah->tx_trig_level >= ah->config.max_txtrig_level)
                 return false;
 
-        omask = ath9k_hw_set_interrupts(ah, ah->mask_reg & ~ATH9K_INT_GLOBAL);
+        omask = ath9k_hw_set_interrupts(ah, ah->imask & ~ATH9K_INT_GLOBAL);
 
         txcfg = REG_READ(ah, AR_TXCFG);
         curLevel = MS(txcfg, AR_FTRIG);