From 9d9a2fa7dcbd05a1608a6a38b6ec1a092e117c3c Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 13 Jul 2015 20:46:06 +0000 Subject: [PATCH] MIPS: ath91: Remove pointless irqdisable/enable The various interrupt flow handlers in ath79 are cascading interrupt handlers. They all have a disable_irq_nosync()/enable_irq() pair around the generic_handle_irq() call. The value of this disable/enable is zero because its a complete noop: disable_irq_nosync() merily increments the disable count without actually masking the interrupt. enable_irq() soleley decrements the disable count without touching the interrupt chip. The interrupt cannot arrive again because the complete call chain runs with interrupts disabled. Remove it. Signed-off-by: Thomas Gleixner Cc: linux-mips@linux-mips.org Cc: LKML Cc: Jiang Liu Patchwork: https://patchwork.linux-mips.org/patch/10703/ Signed-off-by: Ralf Baechle --- arch/mips/ath79/irq.c | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c index 2021be20d9d9..807132b838b2 100644 --- a/arch/mips/ath79/irq.c +++ b/arch/mips/ath79/irq.c @@ -123,8 +123,6 @@ static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc) { u32 status; - disable_irq_nosync(irq); - status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS); if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) { @@ -136,8 +134,6 @@ static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc) } else { spurious_interrupt(); } - - enable_irq(irq); } static void ar934x_ip2_irq_init(void) @@ -156,14 +152,12 @@ static void qca955x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc) { u32 status; - disable_irq_nosync(irq); - status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS); status &= QCA955X_EXT_INT_PCIE_RC1_ALL | QCA955X_EXT_INT_WMAC_ALL; if (status == 0) { spurious_interrupt(); - goto enable; + return; } if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) { @@ -175,17 +169,12 @@ static void qca955x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc) /* TODO: flush DDR? */ generic_handle_irq(ATH79_IP2_IRQ(1)); } - -enable: - enable_irq(irq); } static void qca955x_ip3_irq_dispatch(unsigned int irq, struct irq_desc *desc) { u32 status; - disable_irq_nosync(irq); - status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS); status &= QCA955X_EXT_INT_PCIE_RC2_ALL | QCA955X_EXT_INT_USB1 | @@ -193,7 +182,7 @@ static void qca955x_ip3_irq_dispatch(unsigned int irq, struct irq_desc *desc) if (status == 0) { spurious_interrupt(); - goto enable; + return; } if (status & QCA955X_EXT_INT_USB1) { @@ -210,9 +199,6 @@ static void qca955x_ip3_irq_dispatch(unsigned int irq, struct irq_desc *desc) /* TODO: flush DDR? */ generic_handle_irq(ATH79_IP3_IRQ(2)); } - -enable: - enable_irq(irq); } static void qca955x_irq_init(void) -- 2.11.0