[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>

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);