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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2006-06-04 02:51:38 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-05 12:29:16 -0700
commit78b86e579f11e7d7bd45acd90b6a87cd4b7c5a54 (patch)
tree2515fd95638aa037a68ed080adfe6759cf28625b
parent6d09bb627d2470299dfb1af0e6d27fb4aece9196 (diff)
downloadlinux-stericsson-78b86e579f11e7d7bd45acd90b6a87cd4b7c5a54.tar.gz
[PATCH] pmf_register_irq_client() gives sleep with locks held warning
From: Benjamin Herrenschmidt <benh@kernel.crashing.org> This fixes request_irq() potentially called from atomic context. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/powerpc/platforms/powermac/pfunc_core.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/arch/powerpc/platforms/powermac/pfunc_core.c b/arch/powerpc/platforms/powermac/pfunc_core.c
index 4baa75b1d36f..f08173b0f065 100644
--- a/arch/powerpc/platforms/powermac/pfunc_core.c
+++ b/arch/powerpc/platforms/powermac/pfunc_core.c
@@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <asm/semaphore.h>
#include <asm/prom.h>
@@ -546,6 +547,7 @@ struct pmf_device {
static LIST_HEAD(pmf_devices);
static spinlock_t pmf_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_MUTEX(pmf_irq_mutex);
static void pmf_release_device(struct kref *kref)
{
@@ -864,15 +866,17 @@ int pmf_register_irq_client(struct device_node *target,
spin_lock_irqsave(&pmf_lock, flags);
func = __pmf_find_function(target, name, PMF_FLAGS_INT_GEN);
- if (func == NULL) {
- spin_unlock_irqrestore(&pmf_lock, flags);
+ if (func)
+ func = pmf_get_function(func);
+ spin_unlock_irqrestore(&pmf_lock, flags);
+ if (func == NULL)
return -ENODEV;
- }
+ mutex_lock(&pmf_irq_mutex);
if (list_empty(&func->irq_clients))
func->dev->handlers->irq_enable(func);
list_add(&client->link, &func->irq_clients);
client->func = func;
- spin_unlock_irqrestore(&pmf_lock, flags);
+ mutex_unlock(&pmf_irq_mutex);
return 0;
}
@@ -881,16 +885,16 @@ 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);
- spin_lock_irqsave(&pmf_lock, flags);
+ mutex_lock(&pmf_irq_mutex);
client->func = NULL;
list_del(&client->link);
if (list_empty(&func->irq_clients))
func->dev->handlers->irq_disable(func);
- spin_unlock_irqrestore(&pmf_lock, flags);
+ mutex_unlock(&pmf_irq_mutex);
+ pmf_put_function(func);
}
EXPORT_SYMBOL_GPL(pmf_unregister_irq_client);