ath9k_hw: fix RF bank initialization

ar900*_init_mode_regs needs to be called before RF banks are allocated,
otherwise the storage size of RF banks isn't known. This patch fixes
a memory overrun that can show up as a crash on unloading the module.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9002_hw.c

@@ -23,13 +23,13 @@
 
 /* General hardware code for the A5008/AR9001/AR9002 hadware families */
 
-static void ar9002_hw_init_mode_regs(struct ath_hw *ah)
+static int ar9002_hw_init_mode_regs(struct ath_hw *ah)
 {
 	if (AR_SREV_9271(ah)) {
 		INIT_INI_ARRAY(&ah->iniModes, ar9271Modes_9271);
 		INIT_INI_ARRAY(&ah->iniCommon, ar9271Common_9271);
 		INIT_INI_ARRAY(&ah->iniModes_9271_ANI_reg, ar9271Modes_9271_ANI_reg);
-		return;
+		return 0;
 	}
 
 	if (ah->config.pcie_clock_req)
@@ -104,7 +104,7 @@ static void ar9002_hw_init_mode_regs(struct ath_hw *ah)
 
 		data = devm_kzalloc(ah->dev, size, GFP_KERNEL);
 		if (!data)
-			return;
+			return -ENOMEM;
 
 		memcpy(data, addac->ia_array, size);
 		addac->ia_array = data;
@@ -120,6 +120,7 @@ static void ar9002_hw_init_mode_regs(struct ath_hw *ah)
 		INIT_INI_ARRAY(&ah->iniCckfirJapan2484,
 		       ar9287Common_japan_2484_cck_fir_coeff_9287_1_1);
 	}
+	return 0;
 }
 
 static void ar9280_20_hw_init_rxgain_ini(struct ath_hw *ah)
@@ -415,7 +416,10 @@ int ar9002_hw_attach_ops(struct ath_hw *ah)
 	struct ath_hw_ops *ops = ath9k_hw_ops(ah);
 	int ret;
 
-	priv_ops->init_mode_regs = ar9002_hw_init_mode_regs;
+	ret = ar9002_hw_init_mode_regs(ah);
+	if (ret)
+		return ret;
+
 	priv_ops->init_mode_gain_regs = ar9002_hw_init_mode_gain_regs;
 
 	ops->config_pci_powersave = ar9002_hw_configpcipowersave;

drivers/net/wireless/ath/ath9k/ar9003_hw.c

@@ -704,7 +704,7 @@ void ar9003_hw_attach_ops(struct ath_hw *ah)
 	struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
 	struct ath_hw_ops *ops = ath9k_hw_ops(ah);
 
-	priv_ops->init_mode_regs = ar9003_hw_init_mode_regs;
+	ar9003_hw_init_mode_regs(ah);
 	priv_ops->init_mode_gain_regs = ar9003_hw_init_mode_gain_regs;
 
 	ops->config_pci_powersave = ar9003_hw_configpcipowersave;

drivers/net/wireless/ath/ath9k/hw.c

@@ -54,11 +54,6 @@ static void ath9k_hw_init_cal_settings(struct ath_hw *ah)
 	ath9k_hw_private_ops(ah)->init_cal_settings(ah);
 }
 
-static void ath9k_hw_init_mode_regs(struct ath_hw *ah)
-{
-	ath9k_hw_private_ops(ah)->init_mode_regs(ah);
-}
-
 static u32 ath9k_hw_compute_pll_control(struct ath_hw *ah,
 					struct ath9k_channel *chan)
 {
@@ -670,8 +665,6 @@ static int __ath9k_hw_init(struct ath_hw *ah)
 	if (!AR_SREV_9300_20_OR_LATER(ah))
 		ah->ani_function &= ~ATH9K_ANI_MRC_CCK;
 
-	ath9k_hw_init_mode_regs(ah);
-
 	if (!ah->is_pciexpress)
 		ath9k_hw_disablepcie(ah);
 

drivers/net/wireless/ath/ath9k/hw.h

@@ -600,7 +600,6 @@ struct ath_hw_radar_conf {
  * @init_cal_settings: setup types of calibrations supported
  * @init_cal: starts actual calibration
  *
- * @init_mode_regs: Initializes mode registers
  * @init_mode_gain_regs: Initialize TX/RX gain registers
  *
  * @rf_set_freq: change frequency
@@ -619,7 +618,6 @@ struct ath_hw_private_ops {
 	void (*init_cal_settings)(struct ath_hw *ah);
 	bool (*init_cal)(struct ath_hw *ah, struct ath9k_channel *chan);
 
-	void (*init_mode_regs)(struct ath_hw *ah);
 	void (*init_mode_gain_regs)(struct ath_hw *ah);
 	void (*setup_calibration)(struct ath_hw *ah,
 				  struct ath9k_cal_list *currCal);