ath9k: Handle errors properly in MCI initialization

The MCI initialization path has various points of failures,
handle these to ensure that we bail out correctly in such
cases.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9003_mci.c

@@ -813,8 +813,8 @@ static void ar9003_mci_osla_setup(struct ath_hw *ah, bool enable)
 		      AR_BTCOEX_CTRL_ONE_STEP_LOOK_AHEAD_EN, 1);
 }
 
-void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
-		      bool is_full_sleep)
+int ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
+		     bool is_full_sleep)
 {
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
@@ -824,14 +824,13 @@ void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
 		is_full_sleep, is_2g);
 
 	if (!mci->gpm_addr && !mci->sched_addr) {
-		ath_dbg(common, MCI,
-			"MCI GPM and schedule buffers are not allocated\n");
-		return;
+		ath_err(common, "MCI GPM and schedule buffers are not allocated\n");
+		return -ENOMEM;
 	}
 
 	if (REG_READ(ah, AR_BTCOEX_CTRL) == 0xdeadbeef) {
-		ath_dbg(common, MCI, "BTCOEX control register is dead\n");
-		return;
+		ath_err(common, "BTCOEX control register is dead\n");
+		return -EINVAL;
 	}
 
 	/* Program MCI DMA related registers */
@@ -913,6 +912,8 @@ void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
 
 	if (en_int)
 		ar9003_mci_enable_interrupt(ah);
+
+	return 0;
 }
 
 void ar9003_mci_stop_bt(struct ath_hw *ah, bool save_fullsleep)
@@ -1144,8 +1145,8 @@ void ar9003_mci_init_cal_done(struct ath_hw *ah)
 	ar9003_mci_send_message(ah, MCI_GPM, 0, pld, 16, true, false);
 }
 
-void ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
-		      u16 len, u32 sched_addr)
+int ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
+		     u16 len, u32 sched_addr)
 {
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
 
@@ -1154,7 +1155,7 @@ void ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
 	mci->gpm_len = len;
 	mci->sched_addr = sched_addr;
 
-	ar9003_mci_reset(ah, true, true, true);
+	return ar9003_mci_reset(ah, true, true, true);
 }
 EXPORT_SYMBOL(ar9003_mci_setup);
 

drivers/net/wireless/ath/ath9k/ar9003_mci.h

@@ -249,8 +249,8 @@ bool ar9003_mci_send_message(struct ath_hw *ah, u8 header, u32 flag,
 			     u32 *payload, u8 len, bool wait_done,
 			     bool check_bt);
 u32 ar9003_mci_state(struct ath_hw *ah, u32 state_type);
-void ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
-		      u16 len, u32 sched_addr);
+int ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
+		     u16 len, u32 sched_addr);
 void ar9003_mci_cleanup(struct ath_hw *ah);
 void ar9003_mci_get_interrupt(struct ath_hw *ah, u32 *raw_intr,
 			      u32 *rx_msg_intr);
@@ -272,8 +272,8 @@ void ar9003_mci_check_bt(struct ath_hw *ah);
 bool ar9003_mci_start_reset(struct ath_hw *ah, struct ath9k_channel *chan);
 int ar9003_mci_end_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 			 struct ath9k_hw_cal_data *caldata);
-void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
-		      bool is_full_sleep);
+int ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
+		     bool is_full_sleep);
 void ar9003_mci_get_isr(struct ath_hw *ah, enum ath9k_int *masked);
 void ar9003_mci_bt_gain_ctrl(struct ath_hw *ah);
 void ar9003_mci_set_power_awake(struct ath_hw *ah);

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

@@ -392,6 +392,7 @@ int ath_mci_setup(struct ath_softc *sc)
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct ath_mci_coex *mci = &sc->mci_coex;
 	struct ath_mci_buf *buf = &mci->sched_buf;
+	int ret;
 
 	buf->bf_addr = dma_alloc_coherent(sc->dev,
 				  ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE,
@@ -411,9 +412,13 @@ int ath_mci_setup(struct ath_softc *sc)
 	mci->gpm_buf.bf_addr = (u8 *)mci->sched_buf.bf_addr + mci->sched_buf.bf_len;
 	mci->gpm_buf.bf_paddr = mci->sched_buf.bf_paddr + mci->sched_buf.bf_len;
 
-	ar9003_mci_setup(sc->sc_ah, mci->gpm_buf.bf_paddr,
-			 mci->gpm_buf.bf_addr, (mci->gpm_buf.bf_len >> 4),
-			 mci->sched_buf.bf_paddr);
+	ret = ar9003_mci_setup(sc->sc_ah, mci->gpm_buf.bf_paddr,
+			       mci->gpm_buf.bf_addr, (mci->gpm_buf.bf_len >> 4),
+			       mci->sched_buf.bf_paddr);
+	if (ret) {
+		ath_err(common, "Failed to initialize MCI\n");
+		return ret;
+	}
 
 	INIT_WORK(&sc->mci_work, ath9k_mci_work);
 	ath_dbg(common, MCI, "MCI Initialized\n");