iwlcore: register locks

Add new lock to be used when accessing some registers. Also move
    the register lock and iwl_grab_nic_access inside the function for register access. This
    will prevent from forgetting to hold locks and nic access in the right way and make code
    easier to maintain.

    We over use the priv->lock spin lock and I guess we need to add new
    one for Tx queue after that we might need to change most of these lock to
    BH and just keep priv->lock as irq type.

Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 16 insertions, 128 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 5b0c6e5bda92..8bed0445ff5d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -98,7 +98,6 @@ const struct iwl3945_rate_info iwl3945_rates[IWL_RATE_COUNT_3945] = {
  *   ... and set IWL_EVT_DISABLE to 1. */
 void iwl3945_disable_events(struct iwl_priv *priv)
 {
-        int ret;
         int i;
         u32 base;               /* SRAM address of event log header */
         u32 disable_ptr;        /* SRAM address of event-disable bitmap array */
@@ -159,26 +158,17 @@ void iwl3945_disable_events(struct iwl_priv *priv)
                 return;
         }
 
-        ret = iwl_grab_nic_access(priv);
-        if (ret) {
-                IWL_WARN(priv, "Can not read from adapter at this time.\n");
-                return;
-        }
-
         disable_ptr = iwl_read_targ_mem(priv, base + (4 * sizeof(u32)));
         array_size = iwl_read_targ_mem(priv, base + (5 * sizeof(u32)));
-        iwl_release_nic_access(priv);
 
         if (IWL_EVT_DISABLE && (array_size == IWL_EVT_DISABLE_SIZE)) {
                 IWL_DEBUG_INFO(priv, "Disabling selected uCode log events at 0x%x\n",
                                disable_ptr);
-                ret = iwl_grab_nic_access(priv);
                 for (i = 0; i < IWL_EVT_DISABLE_SIZE; i++)
                         iwl_write_targ_mem(priv,
                                            disable_ptr + (i * sizeof(u32)),
                                            evt_disable[i]);
 
-                iwl_release_nic_access(priv);
         } else {
                 IWL_DEBUG_INFO(priv, "Selected uCode log events may be disabled\n");
                 IWL_DEBUG_INFO(priv, "  by writing \"1\"s into disable bitmap\n");
@@ -908,55 +898,30 @@ u8 iwl3945_sync_sta(struct iwl_priv *priv, int sta_id, u16 tx_rate, u8 flags)
 
 static int iwl3945_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src)
 {
-        int ret;
-        unsigned long flags;
-
-        spin_lock_irqsave(&priv->lock, flags);
-        ret = iwl_grab_nic_access(priv);
-        if (ret) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                return ret;
-        }
-
         if (src == IWL_PWR_SRC_VAUX) {
                 if (pci_pme_capable(priv->pci_dev, PCI_D3cold)) {
                         iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
                                         APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
                                         ~APMG_PS_CTRL_MSK_PWR_SRC);
-                        iwl_release_nic_access(priv);
 
                         iwl_poll_bit(priv, CSR_GPIO_IN,
                                      CSR_GPIO_IN_VAL_VAUX_PWR_SRC,
                                      CSR_GPIO_IN_BIT_AUX_POWER, 5000);
-                } else {
-                        iwl_release_nic_access(priv);
                 }
         } else {
                 iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
                                 APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
                                 ~APMG_PS_CTRL_MSK_PWR_SRC);
 
-                iwl_release_nic_access(priv);
                 iwl_poll_bit(priv, CSR_GPIO_IN, CSR_GPIO_IN_VAL_VMAIN_PWR_SRC,
                              CSR_GPIO_IN_BIT_AUX_POWER, 5000);  /* uS */
         }
-        spin_unlock_irqrestore(&priv->lock, flags);
 
-        return ret;
+        return 0;
 }
 
 static int iwl3945_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 {
-        int rc;
-        unsigned long flags;
-
-        spin_lock_irqsave(&priv->lock, flags);
-        rc = iwl_grab_nic_access(priv);
-        if (rc) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                return rc;
-        }
-
         iwl_write_direct32(priv, FH39_RCSR_RBD_BASE(0), rxq->dma_addr);
         iwl_write_direct32(priv, FH39_RCSR_RPTR_ADDR(0), rxq->rb_stts_dma);
         iwl_write_direct32(priv, FH39_RCSR_WPTR(0), 0);
@@ -973,23 +938,11 @@ static int iwl3945_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
         /* fake read to flush all prev I/O */
         iwl_read_direct32(priv, FH39_RSSR_CTRL);
 
-        iwl_release_nic_access(priv);
-        spin_unlock_irqrestore(&priv->lock, flags);
-
         return 0;
 }
 
 static int iwl3945_tx_reset(struct iwl_priv *priv)
 {
-        int rc;
-        unsigned long flags;
-
-        spin_lock_irqsave(&priv->lock, flags);
-        rc = iwl_grab_nic_access(priv);
-        if (rc) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                return rc;
-        }
 
         /* bypass mode */
         iwl_write_prph(priv, ALM_SCD_MODE_REG, 0x2);
@@ -1017,8 +970,6 @@ static int iwl3945_tx_reset(struct iwl_priv *priv)
                 FH39_TSSR_TX_MSG_CONFIG_REG_VAL_ORDER_RSP_WAIT_TH |
                 FH39_TSSR_TX_MSG_CONFIG_REG_VAL_RSP_WAIT_TH);
 
-        iwl_release_nic_access(priv);
-        spin_unlock_irqrestore(&priv->lock, flags);
 
         return 0;
 }
@@ -1061,7 +1012,7 @@ static int iwl3945_txq_ctx_reset(struct iwl_priv *priv)
 
 static int iwl3945_apm_init(struct iwl_priv *priv)
 {
-        int ret = 0;
+        int ret;
 
         iwl_power_initialize(priv);
 
@@ -1083,10 +1034,6 @@ static int iwl3945_apm_init(struct iwl_priv *priv)
                 goto out;
         }
 
-        ret = iwl_grab_nic_access(priv);
-        if (ret)
-                goto out;
-
         /* enable DMA */
         iwl_write_prph(priv, APMG_CLK_CTRL_REG, APMG_CLK_VAL_DMA_CLK_RQT |
                                                 APMG_CLK_VAL_BSM_CLK_RQT);
@@ -1097,7 +1044,6 @@ static int iwl3945_apm_init(struct iwl_priv *priv)
         iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
                           APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
 
-        iwl_release_nic_access(priv);
 out:
         return ret;
 }
@@ -1196,22 +1142,13 @@ int iwl3945_hw_nic_init(struct iwl_priv *priv)
 
         iwl3945_rx_init(priv, rxq);
 
-        spin_lock_irqsave(&priv->lock, flags);
 
         /* Look at using this instead:
         rxq->need_update = 1;
         iwl_rx_queue_update_write_ptr(priv, rxq);
         */
 
-        rc = iwl_grab_nic_access(priv);
-        if (rc) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                return rc;
-        }
         iwl_write_direct32(priv, FH39_RCSR_WPTR(0), rxq->write & ~7);
-        iwl_release_nic_access(priv);
-
-        spin_unlock_irqrestore(&priv->lock, flags);
 
         rc = iwl3945_txq_ctx_reset(priv);
         if (rc)
@@ -1243,14 +1180,6 @@ void iwl3945_hw_txq_ctx_free(struct iwl_priv *priv)
 void iwl3945_hw_txq_ctx_stop(struct iwl_priv *priv)
 {
         int txq_id;
-        unsigned long flags;
-
-        spin_lock_irqsave(&priv->lock, flags);
-        if (iwl_grab_nic_access(priv)) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                iwl3945_hw_txq_ctx_free(priv);
-                return;
-        }
 
         /* stop SCD */
         iwl_write_prph(priv, ALM_SCD_MODE_REG, 0);
@@ -1263,9 +1192,6 @@ void iwl3945_hw_txq_ctx_stop(struct iwl_priv *priv)
                                 1000);
         }
 
-        iwl_release_nic_access(priv);
-        spin_unlock_irqrestore(&priv->lock, flags);
-
         iwl3945_hw_txq_ctx_free(priv);
 }
 
@@ -1310,12 +1236,8 @@ static void iwl3945_apm_stop(struct iwl_priv *priv)
 
 static int iwl3945_apm_reset(struct iwl_priv *priv)
 {
-        int rc;
-        unsigned long flags;
-
         iwl3945_apm_stop_master(priv);
 
-        spin_lock_irqsave(&priv->lock, flags);
 
         iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
         udelay(10);
@@ -1325,36 +1247,31 @@ static int iwl3945_apm_reset(struct iwl_priv *priv)
         iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
                          CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
 
-        rc = iwl_grab_nic_access(priv);
-        if (!rc) {
-                iwl_write_prph(priv, APMG_CLK_CTRL_REG,
-                                         APMG_CLK_VAL_BSM_CLK_RQT);
+        iwl_write_prph(priv, APMG_CLK_CTRL_REG,
+                                APMG_CLK_VAL_BSM_CLK_RQT);
 
-                iwl_write_prph(priv, APMG_RTC_INT_MSK_REG, 0x0);
-                iwl_write_prph(priv, APMG_RTC_INT_STT_REG,
+        iwl_write_prph(priv, APMG_RTC_INT_MSK_REG, 0x0);
+        iwl_write_prph(priv, APMG_RTC_INT_STT_REG,
                                         0xFFFFFFFF);
 
-                /* enable DMA */
-                iwl_write_prph(priv, APMG_CLK_EN_REG,
-                                         APMG_CLK_VAL_DMA_CLK_RQT |
-                                         APMG_CLK_VAL_BSM_CLK_RQT);
-                udelay(10);
+        /* enable DMA */
+        iwl_write_prph(priv, APMG_CLK_EN_REG,
+                                APMG_CLK_VAL_DMA_CLK_RQT |
+                                APMG_CLK_VAL_BSM_CLK_RQT);
+        udelay(10);
 
-                iwl_set_bits_prph(priv, APMG_PS_CTRL_REG,
+        iwl_set_bits_prph(priv, APMG_PS_CTRL_REG,
                                 APMG_PS_CTRL_VAL_RESET_REQ);
-                udelay(5);
-                iwl_clear_bits_prph(priv, APMG_PS_CTRL_REG,
+        udelay(5);
+        iwl_clear_bits_prph(priv, APMG_PS_CTRL_REG,
                                 APMG_PS_CTRL_VAL_RESET_REQ);
-                iwl_release_nic_access(priv);
-        }
 
         /* Clear the 'host command active' bit... */
         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 
         wake_up_interruptible(&priv->wait_command_queue);
-        spin_unlock_irqrestore(&priv->lock, flags);
 
-        return rc;
+        return 0;
 }
 
 /**
@@ -2500,14 +2417,6 @@ int iwl3945_txpower_set_from_eeprom(struct iwl_priv *priv)
 int iwl3945_hw_rxq_stop(struct iwl_priv *priv)
 {
         int rc;
-        unsigned long flags;
-
-        spin_lock_irqsave(&priv->lock, flags);
-        rc = iwl_grab_nic_access(priv);
-        if (rc) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                return rc;
-        }
 
         iwl_write_direct32(priv, FH39_RCSR_CONFIG(0), 0);
         rc = iwl_poll_direct_bit(priv, FH39_RSSR_STATUS,
@@ -2515,28 +2424,17 @@ int iwl3945_hw_rxq_stop(struct iwl_priv *priv)
         if (rc < 0)
                 IWL_ERR(priv, "Can't stop Rx DMA.\n");
 
-        iwl_release_nic_access(priv);
-        spin_unlock_irqrestore(&priv->lock, flags);
-
         return 0;
 }
 
 int iwl3945_hw_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq)
 {
-        int rc;
-        unsigned long flags;
         int txq_id = txq->q.id;
 
         struct iwl3945_shared *shared_data = priv->shared_virt;
 
         shared_data->tx_base_ptr[txq_id] = cpu_to_le32((u32)txq->q.dma_addr);
 
-        spin_lock_irqsave(&priv->lock, flags);
-        rc = iwl_grab_nic_access(priv);
-        if (rc) {
-                spin_unlock_irqrestore(&priv->lock, flags);
-                return rc;
-        }
         iwl_write_direct32(priv, FH39_CBCC_CTRL(txq_id), 0);
         iwl_write_direct32(priv, FH39_CBCC_BASE(txq_id), 0);
 
@@ -2546,11 +2444,9 @@ int iwl3945_hw_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq)
                 FH39_TCSR_TX_CONFIG_REG_VAL_CIRQ_HOST_IFTFD |
                 FH39_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL |
                 FH39_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE);
-        iwl_release_nic_access(priv);
 
         /* fake read to flush all prev. writes */
         iwl_read32(priv, FH39_TSSR_CBB_BASE);
-        spin_unlock_irqrestore(&priv->lock, flags);
 
         return 0;
 }
@@ -2858,10 +2754,6 @@ static int iwl3945_load_bsm(struct iwl_priv *priv)
         inst_len = priv->ucode_init.len;
         data_len = priv->ucode_init_data.len;
 
-        rc = iwl_grab_nic_access(priv);
-        if (rc)
-                return rc;
-
         iwl_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
         iwl_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
         iwl_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG, inst_len);
@@ -2875,10 +2767,8 @@ static int iwl3945_load_bsm(struct iwl_priv *priv)
                                           le32_to_cpu(*image));
 
         rc = iwl3945_verify_bsm(priv);
-        if (rc) {
-                iwl_release_nic_access(priv);
+        if (rc)
                 return rc;
-        }
 
         /* Tell BSM to copy from BSM SRAM into instruction SRAM, when asked */
         iwl_write_prph(priv, BSM_WR_MEM_SRC_REG, 0x0);
@@ -2910,8 +2800,6 @@ static int iwl3945_load_bsm(struct iwl_priv *priv)
         iwl_write_prph(priv, BSM_WR_CTRL_REG,
                 BSM_WR_CTRL_REG_BIT_START_EN);
 
-        iwl_release_nic_access(priv);
-
         return 0;
 }