iwlwifi: pcie: use don't disable interrupt when irq_lock is taken

Since we don't take this lock in the primary interrupt
handler, there is no pointin disabling the interrupt
in the critical section protected by trans_pcie->irq_lock.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

3 files changed, 26 insertions, 35 deletions

diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c
index 2e11512ca353..7ab510e4be41 100644
--- a/drivers/net/wireless/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/rx.c
@@ -379,13 +379,12 @@ static void iwl_pcie_rxq_free_rbs(struct iwl_trans *trans)
 static void iwl_pcie_rx_replenish(struct iwl_trans *trans)
 {
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-        unsigned long flags;
 
         iwl_pcie_rxq_alloc_rbs(trans, GFP_KERNEL);
 
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         iwl_pcie_rxq_restock(trans);
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 }
 
 static void iwl_pcie_rx_replenish_now(struct iwl_trans *trans)
@@ -541,10 +540,10 @@ int iwl_pcie_rx_init(struct iwl_trans *trans)
 
         iwl_pcie_rx_hw_init(trans, rxq);
 
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         rxq->need_update = 1;
         iwl_pcie_rxq_inc_wr_ptr(trans, rxq);
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         return 0;
 }
@@ -895,12 +894,11 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
         struct isr_statistics *isr_stats = &trans_pcie->isr_stats;
         u32 inta = 0;
         u32 handled = 0;
-        unsigned long flags;
         u32 i;
 
         lock_map_acquire(&trans->sync_cmd_lockdep_map);
 
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
 
         /* dram interrupt table not set yet,
          * use legacy interrupt.
@@ -937,7 +935,7 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
                  */
                 if (test_bit(STATUS_INT_ENABLED, &trans->status))
                         iwl_enable_interrupts(trans);
-                spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+                spin_unlock(&trans_pcie->irq_lock);
                 lock_map_release(&trans->sync_cmd_lockdep_map);
                 return IRQ_NONE;
         }
@@ -948,7 +946,7 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
                  * already raised an interrupt.
                  */
                 IWL_WARN(trans, "HARDWARE GONE?? INTA == 0x%08x\n", inta);
-                spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+                spin_unlock(&trans_pcie->irq_lock);
                 goto out;
         }
 
@@ -969,7 +967,7 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
                 IWL_DEBUG_ISR(trans, "inta 0x%08x, enabled 0x%08x\n",
                               inta, iwl_read32(trans, CSR_INT_MASK));
 
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         /* Now service all interrupt bits discovered above. */
         if (inta & CSR_INT_BIT_HW_ERR) {
@@ -1194,12 +1192,11 @@ void iwl_pcie_reset_ict(struct iwl_trans *trans)
 {
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
         u32 val;
-        unsigned long flags;
 
         if (!trans_pcie->ict_tbl)
                 return;
 
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         iwl_disable_interrupts(trans);
 
         memset(trans_pcie->ict_tbl, 0, ICT_SIZE);
@@ -1216,18 +1213,17 @@ void iwl_pcie_reset_ict(struct iwl_trans *trans)
         trans_pcie->ict_index = 0;
         iwl_write32(trans, CSR_INT, trans_pcie->inta_mask);
         iwl_enable_interrupts(trans);
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 }
 
 /* Device is going down disable ict interrupt usage */
 void iwl_pcie_disable_ict(struct iwl_trans *trans)
 {
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-        unsigned long flags;
 
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         trans_pcie->use_ict = false;
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 }
 
 irqreturn_t iwl_pcie_isr(int irq, void *data)
diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 721050735ee6..9a07cf3062ea 100644
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -271,13 +271,12 @@ static void iwl_pcie_apm_stop(struct iwl_trans *trans)
 static int iwl_pcie_nic_init(struct iwl_trans *trans)
 {
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-        unsigned long flags;
 
         /* nic_init */
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         iwl_pcie_apm_init(trans);
 
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         iwl_pcie_set_pwr(trans, false);
 
@@ -635,13 +634,12 @@ static void iwl_trans_pcie_fw_alive(struct iwl_trans *trans, u32 scd_addr)
 static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
 {
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-        unsigned long flags;
         bool hw_rfkill;
 
         /* tell the device to stop sending interrupts */
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         iwl_disable_interrupts(trans);
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         /* device going down, Stop using ICT table */
         iwl_pcie_disable_ict(trans);
@@ -673,9 +671,9 @@ static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
         /* Upon stop, the APM issues an interrupt if HW RF kill is set.
          * Clean again the interrupt here
          */
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         iwl_disable_interrupts(trans);
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         /* stop and reset the on-board processor */
         iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);
@@ -821,18 +819,17 @@ static int iwl_trans_pcie_start_hw(struct iwl_trans *trans)
 static void iwl_trans_pcie_op_mode_leave(struct iwl_trans *trans)
 {
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-        unsigned long flags;
 
         /* disable interrupts - don't enable HW RF kill interrupt */
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         iwl_disable_interrupts(trans);
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         iwl_pcie_apm_stop(trans);
 
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
         iwl_disable_interrupts(trans);
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         iwl_pcie_disable_ict(trans);
 }
diff --git a/drivers/net/wireless/iwlwifi/pcie/tx.c b/drivers/net/wireless/iwlwifi/pcie/tx.c
index 8df24787c141..b49a185355e4 100644
--- a/drivers/net/wireless/iwlwifi/pcie/tx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/tx.c
@@ -737,10 +737,9 @@ int iwl_pcie_tx_stop(struct iwl_trans *trans)
 {
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
         int ch, txq_id, ret;
-        unsigned long flags;
 
         /* Turn off all Tx DMA fifos */
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
 
         iwl_pcie_txq_set_sched(trans, 0);
 
@@ -757,7 +756,7 @@ int iwl_pcie_tx_stop(struct iwl_trans *trans)
                                 iwl_read_direct32(trans,
                                                   FH_TSSR_TX_STATUS_REG));
         }
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         if (!trans_pcie->txq) {
                 IWL_WARN(trans,
@@ -865,7 +864,6 @@ int iwl_pcie_tx_init(struct iwl_trans *trans)
         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
         int ret;
         int txq_id, slots_num;
-        unsigned long flags;
         bool alloc = false;
 
         if (!trans_pcie->txq) {
@@ -875,7 +873,7 @@ int iwl_pcie_tx_init(struct iwl_trans *trans)
                 alloc = true;
         }
 
-        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+        spin_lock(&trans_pcie->irq_lock);
 
         /* Turn off all Tx DMA fifos */
         iwl_write_prph(trans, SCD_TXFACT, 0);
@@ -884,7 +882,7 @@ int iwl_pcie_tx_init(struct iwl_trans *trans)
         iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
                            trans_pcie->kw.dma >> 4);
 
-        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+        spin_unlock(&trans_pcie->irq_lock);
 
         /* Alloc and init all Tx queues, including the command queue (#4/#9) */
         for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;