diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2006-06-13 17:43:42 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-06-15 19:31:27 +1000 |
| commit | 4312dc76a88146c4f1d693fc4643d1df12aaf755 (patch) | |
| tree | dc416a6b6c562c2563c37d00656fcf6ad2166c12 | |
| parent | 368a6ba5d188552aea2a668301a259164c9f355e (diff) | |
| download | linux-4312dc76a88146c4f1d693fc4643d1df12aaf755.tar.gz linux-4312dc76a88146c4f1d693fc4643d1df12aaf755.tar.bz2 linux-4312dc76a88146c4f1d693fc4643d1df12aaf755.zip | |
[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>
| -rw-r--r-- | arch/powerpc/platforms/powermac/pfunc_core.c | 14 |
1 files changed, 14 insertions, 0 deletions
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); |