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>

3 files changed, 23 insertions, 17 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mci.c b/drivers/net/wireless/ath/ath9k/ar9003_mci.c
index 8dbb60b53f1a..44c202ce6c66 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_mci.c
+++ b/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);
 
diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mci.h b/drivers/net/wireless/ath/ath9k/ar9003_mci.h
index 30acf2869aa4..2a2d01889613 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_mci.h
+++ b/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);
diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
index 8f51e9e358fd..ec2d7c807567 100644
--- a/drivers/net/wireless/ath/ath9k/mci.c
+++ b/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");