From 7b70bd63c61d17a05a03bfc2f4eb83c1200a2509 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Wed, 11 Dec 2013 10:22:28 +0200 Subject: [PATCH] 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 Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/pcie/rx.c | 28 ++++++++++++---------------- drivers/net/wireless/iwlwifi/pcie/trans.c | 23 ++++++++++------------- drivers/net/wireless/iwlwifi/pcie/tx.c | 10 ++++------ 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 2e11512..7ab510e 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 7210507..9a07cf3 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 8df2478..b49a1853 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; -- 2.7.4