[RFC][PATCH 3/3] staging: ion: Avoid using rt_mutexes directly.

[John Stultz]

RT_MUTEXES can be configured out of the kernel, causing compile
problems with ION.

Since there is no documentation as to why directly using rt_mutexes
is necessary (and very few drivers directly use rt_mutexes), simply
convert the ion_heap lock to a normal mutex.

Cc: Colin Cross <ccr...@android.com>
Cc: Android Kernel Team <kernel-t...@android.com>
Cc: Greg KH <gre...@linuxfoundation.org>
Reported-by: Jim Davis <jim.ep...@gmail.com>
Signed-off-by: John Stultz <john.stu...@linaro.org>
---
 drivers/staging/android/ion/ion_heap.c | 20 ++++++++++----------
 drivers/staging/android/ion/ion_priv.h |  2 +-
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/android/ion/ion_heap.c 
b/drivers/staging/android/ion/ion_heap.c
index 9cf5622..88685da 100644
--- a/drivers/staging/android/ion/ion_heap.c
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -160,10 +160,10 @@ int ion_heap_pages_zero(struct page *page, size_t size, 
pgprot_t pgprot)
 
 void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer *buffer)
 {
-       rt_mutex_lock(&heap->lock);
+       mutex_lock(&heap->lock);
        list_add(&buffer->list, &heap->free_list);
        heap->free_list_size += buffer->size;
-       rt_mutex_unlock(&heap->lock);
+       mutex_unlock(&heap->lock);
        wake_up(&heap->waitqueue);
 }
 
@@ -171,9 +171,9 @@ size_t ion_heap_freelist_size(struct ion_heap *heap)
 {
        size_t size;
 
-       rt_mutex_lock(&heap->lock);
+       mutex_lock(&heap->lock);
        size = heap->free_list_size;
-       rt_mutex_unlock(&heap->lock);
+       mutex_unlock(&heap->lock);
 
        return size;
 }
@@ -186,7 +186,7 @@ size_t ion_heap_freelist_drain(struct ion_heap *heap, 
size_t size)
        if (ion_heap_freelist_size(heap) == 0)
                return 0;
 
-       rt_mutex_lock(&heap->lock);
+       mutex_lock(&heap->lock);
        if (size == 0)
                size = heap->free_list_size;
 
@@ -198,7 +198,7 @@ size_t ion_heap_freelist_drain(struct ion_heap *heap, 
size_t size)
                total_drained += buffer->size;
                ion_buffer_destroy(buffer);
        }
-       rt_mutex_unlock(&heap->lock);
+       mutex_unlock(&heap->lock);
 
        return total_drained;
 }
@@ -213,16 +213,16 @@ static int ion_heap_deferred_free(void *data)
                wait_event_freezable(heap->waitqueue,
                                     ion_heap_freelist_size(heap) > 0);
 
-               rt_mutex_lock(&heap->lock);
+               mutex_lock(&heap->lock);
                if (list_empty(&heap->free_list)) {
-                       rt_mutex_unlock(&heap->lock);
+                       mutex_unlock(&heap->lock);
                        continue;
                }
                buffer = list_first_entry(&heap->free_list, struct ion_buffer,
                                          list);
                list_del(&buffer->list);
                heap->free_list_size -= buffer->size;
-               rt_mutex_unlock(&heap->lock);
+               mutex_unlock(&heap->lock);
                ion_buffer_destroy(buffer);
        }
 
@@ -235,7 +235,7 @@ int ion_heap_init_deferred_free(struct ion_heap *heap)
 
        INIT_LIST_HEAD(&heap->free_list);
        heap->free_list_size = 0;
-       rt_mutex_init(&heap->lock);
+       mutex_init(&heap->lock);
        init_waitqueue_head(&heap->waitqueue);
        heap->task = kthread_run(ion_heap_deferred_free, heap,
                                 "%s", heap->name);
diff --git a/drivers/staging/android/ion/ion_priv.h 
b/drivers/staging/android/ion/ion_priv.h
index fc8a4c3..df81ce1 100644
--- a/drivers/staging/android/ion/ion_priv.h
+++ b/drivers/staging/android/ion/ion_priv.h
@@ -159,7 +159,7 @@ struct ion_heap {
        struct shrinker shrinker;
        struct list_head free_list;
        size_t free_list_size;
-       struct rt_mutex lock;
+       struct mutex lock;
        wait_queue_head_t waitqueue;
        struct task_struct *task;
        int (*debug_show)(struct ion_heap *heap, struct seq_file *, void *);
-- 
1.8.3.2

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