From 4312dc76a88146c4f1d693fc4643d1df12aaf755 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 13 Jun 2006 17:43:42 +0200 Subject: [PATCH] [POWERPC] make pmf irq_client functions safe against pmf interrupts coming in This fixes the pmf irq_client functions to be safe against pmf interrupts coming in while a client is registered/unregistered. Signed-off-by: Johannes Berg Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/powermac/pfunc_core.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/powerpc/platforms/powermac/pfunc_core.c b/arch/powerpc/platforms/powermac/pfunc_core.c index f08173b0f065..047f954a89eb 100644 --- a/arch/powerpc/platforms/powermac/pfunc_core.c +++ b/arch/powerpc/platforms/powermac/pfunc_core.c @@ -871,10 +871,17 @@ int pmf_register_irq_client(struct device_node *target, spin_unlock_irqrestore(&pmf_lock, flags); if (func == NULL) return -ENODEV; + + /* guard against manipulations of list */ mutex_lock(&pmf_irq_mutex); if (list_empty(&func->irq_clients)) func->dev->handlers->irq_enable(func); + + /* guard against pmf_do_irq while changing list */ + spin_lock_irqsave(&pmf_lock, flags); list_add(&client->link, &func->irq_clients); + spin_unlock_irqrestore(&pmf_lock, flags); + client->func = func; mutex_unlock(&pmf_irq_mutex); @@ -885,12 +892,19 @@ EXPORT_SYMBOL_GPL(pmf_register_irq_client); void pmf_unregister_irq_client(struct pmf_irq_client *client) { struct pmf_function *func = client->func; + unsigned long flags; BUG_ON(func == NULL); + /* guard against manipulations of list */ mutex_lock(&pmf_irq_mutex); client->func = NULL; + + /* guard against pmf_do_irq while changing list */ + spin_lock_irqsave(&pmf_lock, flags); list_del(&client->link); + spin_unlock_irqrestore(&pmf_lock, flags); + if (list_empty(&func->irq_clients)) func->dev->handlers->irq_disable(func); mutex_unlock(&pmf_irq_mutex);