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[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 <johannes@sipsolutions.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
hifive-unleashed-5.1
Johannes Berg 2006-06-13 17:43:42 +02:00 committed by Paul Mackerras
parent 368a6ba5d1
commit 4312dc76a8
1 changed files with 14 additions and 0 deletions
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14
arch/powerpc/platforms/powermac/pfunc_core.c
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@ -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);