From 41fb5e62604c5ddd00a784ffb7672dd8df5d76f2 Mon Sep 17 00:00:00 2001 From: Milton Miller Date: Tue, 10 May 2011 19:30:44 +0000 Subject: [PATCH] powerpc: Make IRQ_NOREQUEST last to clear, first to set When creating an irq, don't allow a concurent driver request until we have caled map, which will likley call set_chip_and_handler to change the irq_chip and its operations. Similarly, when tearing down an IRQ, make sure no new uses come along while we change the irq back to the nop chip and then reset the descriptor to freed status. Signed-off-by: Milton Miller Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/irq.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 4368b5ed5604..a24d37d4cf51 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -586,14 +586,14 @@ struct irq_host *irq_alloc_host(struct device_node *of_node, irq_map[i].host = host; smp_wmb(); - /* Clear norequest flags */ - irq_clear_status_flags(i, IRQ_NOREQUEST); - /* Legacy flags are left to default at this point, * one can then use irq_create_mapping() to * explicitly change them */ ops->map(host, i, i); + + /* Clear norequest flags */ + irq_clear_status_flags(i, IRQ_NOREQUEST); } break; case IRQ_HOST_MAP_LINEAR: @@ -664,8 +664,6 @@ static int irq_setup_virq(struct irq_host *host, unsigned int virq, goto error; } - irq_clear_status_flags(virq, IRQ_NOREQUEST); - /* map it */ smp_wmb(); irq_map[virq].hwirq = hwirq; @@ -676,6 +674,8 @@ static int irq_setup_virq(struct irq_host *host, unsigned int virq, goto errdesc; } + irq_clear_status_flags(virq, IRQ_NOREQUEST); + return 0; errdesc: @@ -819,6 +819,8 @@ void irq_dispose_mapping(unsigned int virq) if (host->revmap_type == IRQ_HOST_MAP_LEGACY) return; + irq_set_status_flags(virq, IRQ_NOREQUEST); + /* remove chip and handler */ irq_set_chip_and_handler(virq, NULL, NULL); @@ -848,8 +850,6 @@ void irq_dispose_mapping(unsigned int virq) smp_mb(); irq_map[virq].hwirq = host->inval_irq; - irq_set_status_flags(virq, IRQ_NOREQUEST); - irq_free_descs(virq, 1); /* Free it */ irq_free_virt(virq, 1); -- 2.20.1