Currently we initialize the heap free_lock and free list size in
ion_heap_init_deferred_free, which is only called when the
ION_HEAP_FLAG_DEFER_FREE heap flag is given. However, the lock and size
are used in the shrinker path as well as the deferred free path, and we
can register a shrinker *without* enabling deferred freeing. So, if a
heap provides a shrinker but *doesn't* set the DEFER_FREE flag we will
use these parameters uninitialized (resulting in a spinlock bug and
broken shrinker accounting).
Fix these problems by initializing the free list parameters directly in
ion_device_add_heap, which is always called no matter which heap
features are being used.
Signed-off-by: Mitchel Humpherys <mitchelh@xxxxxxxxxxxxxx>
---
drivers/staging/android/ion/ion.c | 3 +++
drivers/staging/android/ion/ion_heap.c | 2 --
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 296d347660fc..b8f1c491553e 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1508,6 +1508,9 @@ void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
pr_err("%s: can not add heap with invalid ops struct.\n",
__func__);
+ spin_lock_init(&heap->free_lock);
+ heap->free_list_size = 0;
+
if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
ion_heap_init_deferred_free(heap);
diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c
index 4605e04712aa..fd13d05b538a 100644
--- a/drivers/staging/android/ion/ion_heap.c
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -253,8 +253,6 @@ int ion_heap_init_deferred_free(struct ion_heap *heap)
struct sched_param param = { .sched_priority = 0 };
INIT_LIST_HEAD(&heap->free_list);
- heap->free_list_size = 0;
- spin_lock_init(&heap->free_lock);
init_waitqueue_head(&heap->waitqueue);
heap->task = kthread_run(ion_heap_deferred_free, heap,
"%s", heap->name);
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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