From: Joonwoo Park Date: Wed, 23 Jan 2008 18:15:20 +0000 (-0800) Subject: iwlwifi: do not schedule tasklet when rcv unused irq X-Git-Tag: v2.6.25-rc1~1089^2~160 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25c03d8e8c13c5468155c58013b03841161b4559;p=linux-2.6 iwlwifi: do not schedule tasklet when rcv unused irq The nic controller's scheduler interrupt (CSR_INT_BIT_SCD) indicates to the driver that scheduler finished to transmit the frame/frames. This bit is not used and the tasklet should thus not be scheduled upon its receipt. Signed-off-by: Joonwoo Park Signed-off-by: Reinette Chatre Signed-off-by: John W. Linville Signed-off-by: David S. Miller --- diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-hw.h b/drivers/net/wireless/iwlwifi/iwl-3945-hw.h index 6e0187393a..571815d7e8 100644 --- a/drivers/net/wireless/iwlwifi/iwl-3945-hw.h +++ b/drivers/net/wireless/iwlwifi/iwl-3945-hw.h @@ -373,7 +373,7 @@ struct iwl3945_eeprom { #define CSR_INT_BIT_HW_ERR (1 << 29) /* DMA hardware error FH_INT[31] */ #define CSR_INT_BIT_DNLD (1 << 28) /* uCode Download */ #define CSR_INT_BIT_FH_TX (1 << 27) /* Tx DMA FH_INT[1:0] */ -#define CSR_INT_BIT_MAC_CLK_ACTV (1 << 26) /* NIC controller's clock toggled on/off */ +#define CSR_INT_BIT_SCD (1 << 26) /* TXQ pointer advanced */ #define CSR_INT_BIT_SW_ERR (1 << 25) /* uCode error */ #define CSR_INT_BIT_RF_KILL (1 << 7) /* HW RFKILL switch GP_CNTRL[27] toggled */ #define CSR_INT_BIT_CT_KILL (1 << 6) /* Critical temp (chip too hot) rfkill */ diff --git a/drivers/net/wireless/iwlwifi/iwl-4965-hw.h b/drivers/net/wireless/iwlwifi/iwl-4965-hw.h index ff71c09ab1..ffe1e9dfde 100644 --- a/drivers/net/wireless/iwlwifi/iwl-4965-hw.h +++ b/drivers/net/wireless/iwlwifi/iwl-4965-hw.h @@ -465,7 +465,7 @@ struct iwl4965_eeprom { #define CSR_INT_BIT_HW_ERR (1 << 29) /* DMA hardware error FH_INT[31] */ #define CSR_INT_BIT_DNLD (1 << 28) /* uCode Download */ #define CSR_INT_BIT_FH_TX (1 << 27) /* Tx DMA FH_INT[1:0] */ -#define CSR_INT_BIT_MAC_CLK_ACTV (1 << 26) /* NIC controller's clock toggled on/off */ +#define CSR_INT_BIT_SCD (1 << 26) /* TXQ pointer advanced */ #define CSR_INT_BIT_SW_ERR (1 << 25) /* uCode error */ #define CSR_INT_BIT_RF_KILL (1 << 7) /* HW RFKILL switch GP_CNTRL[27] toggled */ #define CSR_INT_BIT_CT_KILL (1 << 6) /* Critical temp (chip too hot) rfkill */ diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c index 8cef48c9d7..f644c6bba8 100644 --- a/drivers/net/wireless/iwlwifi/iwl3945-base.c +++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c @@ -4759,8 +4759,9 @@ static void iwl3945_irq_tasklet(struct iwl3945_priv *priv) #ifdef CONFIG_IWL3945_DEBUG if (iwl3945_debug_level & (IWL_DL_ISR)) { /* NIC fires this, but we don't use it, redundant with WAKEUP */ - if (inta & CSR_INT_BIT_MAC_CLK_ACTV) - IWL_DEBUG_ISR("Microcode started or stopped.\n"); + if (inta & CSR_INT_BIT_SCD) + IWL_DEBUG_ISR("Scheduler finished to transmit " + "the frame/frames.\n"); /* Alive notification via Rx interrupt will do the real work */ if (inta & CSR_INT_BIT_ALIVE) @@ -4768,7 +4769,7 @@ static void iwl3945_irq_tasklet(struct iwl3945_priv *priv) } #endif /* Safely ignore these bits for debug checks below */ - inta &= ~(CSR_INT_BIT_MAC_CLK_ACTV | CSR_INT_BIT_ALIVE); + inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE); /* HW RF KILL switch toggled (4965 only) */ if (inta & CSR_INT_BIT_RF_KILL) { @@ -4904,8 +4905,11 @@ static irqreturn_t iwl3945_isr(int irq, void *data) IWL_DEBUG_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n", inta, inta_mask, inta_fh); + inta &= ~CSR_INT_BIT_SCD; + /* iwl3945_irq_tasklet() will service interrupts and re-enable them */ - tasklet_schedule(&priv->irq_tasklet); + if (likely(inta || inta_fh)) + tasklet_schedule(&priv->irq_tasklet); unplugged: spin_unlock(&priv->lock); diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c index c856835b1f..131cf5adbd 100644 --- a/drivers/net/wireless/iwlwifi/iwl4965-base.c +++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c @@ -5137,8 +5137,9 @@ static void iwl4965_irq_tasklet(struct iwl4965_priv *priv) #ifdef CONFIG_IWL4965_DEBUG if (iwl4965_debug_level & (IWL_DL_ISR)) { /* NIC fires this, but we don't use it, redundant with WAKEUP */ - if (inta & CSR_INT_BIT_MAC_CLK_ACTV) - IWL_DEBUG_ISR("Microcode started or stopped.\n"); + if (inta & CSR_INT_BIT_SCD) + IWL_DEBUG_ISR("Scheduler finished to transmit " + "the frame/frames.\n"); /* Alive notification via Rx interrupt will do the real work */ if (inta & CSR_INT_BIT_ALIVE) @@ -5146,7 +5147,7 @@ static void iwl4965_irq_tasklet(struct iwl4965_priv *priv) } #endif /* Safely ignore these bits for debug checks below */ - inta &= ~(CSR_INT_BIT_MAC_CLK_ACTV | CSR_INT_BIT_ALIVE); + inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE); /* HW RF KILL switch toggled */ if (inta & CSR_INT_BIT_RF_KILL) { @@ -5275,8 +5276,11 @@ static irqreturn_t iwl4965_isr(int irq, void *data) IWL_DEBUG_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n", inta, inta_mask, inta_fh); + inta &= ~CSR_INT_BIT_SCD; + /* iwl4965_irq_tasklet() will service interrupts and re-enable them */ - tasklet_schedule(&priv->irq_tasklet); + if (likely(inta || inta_fh)) + tasklet_schedule(&priv->irq_tasklet); unplugged: spin_unlock(&priv->lock);