---
drivers/dma-buf/dma-resv.c | 128 +++++++++++++++++++------------------
1 file changed, 65 insertions(+), 63 deletions(-)
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 6ddbeb5dfbf6..87f5d82d992a 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
/*
* Copyright (C) 2012-2014 Canonical Ltd (Maarten Lankhorst)
*
@@ -92,49 +93,6 @@ static void dma_resv_list_free(struct dma_resv_list *list)
kfree_rcu(list, rcu);
}
-#if IS_ENABLED(CONFIG_LOCKDEP)
-static int __init dma_resv_lockdep(void)
-{
- struct mm_struct *mm = mm_alloc();
- struct ww_acquire_ctx ctx;
- struct dma_resv obj;
- struct address_space mapping;
- int ret;
-
- if (!mm)
- return -ENOMEM;
-
- dma_resv_init(&obj);
- address_space_init_once(&mapping);
-
- mmap_read_lock(mm);
- ww_acquire_init(&ctx, &reservation_ww_class);
- ret = dma_resv_lock(&obj, &ctx);
- if (ret == -EDEADLK)
- dma_resv_lock_slow(&obj, &ctx);
- fs_reclaim_acquire(GFP_KERNEL);
- /* for unmap_mapping_range on trylocked buffer objects in shrinkers */
- i_mmap_lock_write(&mapping);
- i_mmap_unlock_write(&mapping);
-#ifdef CONFIG_MMU_NOTIFIER
- lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
- __dma_fence_might_wait();
- lock_map_release(&__mmu_notifier_invalidate_range_start_map);
-#else
- __dma_fence_might_wait();
-#endif
- fs_reclaim_release(GFP_KERNEL);
- ww_mutex_unlock(&obj.lock);
- ww_acquire_fini(&ctx);
- mmap_read_unlock(mm);
-
- mmput(mm);
-
- return 0;
-}
-subsys_initcall(dma_resv_lockdep);
-#endif
-
/**
* dma_resv_init - initialize a reservation object
* @obj: the reservation object
@@ -196,9 +154,7 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned
int num_fences)
if (old && old->shared_max) {
if ((old->shared_count + num_fences) <= old->shared_max)
return 0;
- else
- max = max(old->shared_count + num_fences,
- old->shared_max * 2);
+ max = max(old->shared_count + num_fences, old->shared_max * 2);
} else {
max = max(4ul, roundup_pow_of_two(num_fences));
}
@@ -337,17 +293,17 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct
dma_fence *fence)
EXPORT_SYMBOL(dma_resv_add_excl_fence);
/**
-* dma_resv_copy_fences - Copy all fences from src to dst.
-* @dst: the destination reservation object
-* @src: the source reservation object
-*
-* Copy all fences from src to dst. dst-lock must be held.
-*/
+ * dma_resv_copy_fences - Copy all fences from src to dst.
+ * @dst: the destination reservation object
+ * @src: the source reservation object
+ *
+ * Copy all fences from src to dst. dst-lock must be held.
+ */
int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
{
struct dma_resv_list *src_list, *dst_list;
struct dma_fence *old, *new;
- unsigned i;
+ unsigned int i;
dma_resv_assert_held(dst);
@@ -356,7 +312,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
retry:
if (src_list) {
- unsigned shared_count = src_list->shared_count;
+ unsigned int shared_count = src_list->shared_count;
rcu_read_unlock();
@@ -373,6 +329,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
dst_list->shared_count = 0;
for (i = 0; i < src_list->shared_count; ++i) {
+ struct dma_fence __rcu **dst;
struct dma_fence *fence;
fence = rcu_dereference(src_list->shared[i]);
@@ -391,7 +348,8 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct
dma_resv *src)
continue;
}
- rcu_assign_pointer(dst_list->shared[dst_list->shared_count++], fence);
+ dst = &dst_list->shared[dst_list->shared_count++];
+ rcu_assign_pointer(*dst, fence);
}
} else {
dst_list = NULL;
@@ -431,7 +389,7 @@ EXPORT_SYMBOL(dma_resv_copy_fences);
*/
int dma_resv_get_fences_rcu(struct dma_resv *obj,
struct dma_fence **pfence_excl,
- unsigned *pshared_count,
+ unsigned int *pshared_count,
struct dma_fence ***pshared)
{
struct dma_fence **shared = NULL;
@@ -533,9 +491,9 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
bool wait_all, bool intr,
unsigned long timeout)
{
- struct dma_fence *fence;
- unsigned seq, shared_count;
long ret = timeout ? timeout : 1;
+ unsigned int seq, shared_count;
+ struct dma_fence *fence;
int i;
retry:
@@ -565,8 +523,9 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
shared_count = fobj->shared_count;
for (i = 0; !fence && i < shared_count; ++i) {
- struct dma_fence *lfence =
rcu_dereference(fobj->shared[i]);
+ struct dma_fence *lfence;
+ lfence = rcu_dereference(fobj->shared[i]);
if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
&lfence->flags))
continue;
@@ -633,7 +592,7 @@ static inline int dma_resv_test_signaled_single(struct
dma_fence *passed_fence)
*/
bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool test_all)
{
- unsigned seq, shared_count;
+ unsigned int seq, shared_count;
int ret;
rcu_read_lock();
@@ -643,16 +602,16 @@ bool dma_resv_test_signaled_rcu(struct dma_resv *obj,
bool test_all)
seq = read_seqcount_begin(&obj->seq);
if (test_all) {
- unsigned i;
-
struct dma_resv_list *fobj = rcu_dereference(obj->fence);
+ unsigned int i;
if (fobj)
shared_count = fobj->shared_count;
for (i = 0; i < shared_count; ++i) {
- struct dma_fence *fence =
rcu_dereference(fobj->shared[i]);
+ struct dma_fence *fence;
+ fence = rcu_dereference(fobj->shared[i]);
ret = dma_resv_test_signaled_single(fence);
if (ret < 0)
goto retry;
@@ -681,3 +640,46 @@ bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool
test_all)
return ret;
}
EXPORT_SYMBOL_GPL(dma_resv_test_signaled_rcu);
+
+#if IS_ENABLED(CONFIG_LOCKDEP)
+static int __init dma_resv_lockdep(void)
+{
+ struct mm_struct *mm = mm_alloc();
+ struct ww_acquire_ctx ctx;
+ struct dma_resv obj;
+ struct address_space mapping;
+ int ret;
+
+ if (!mm)
+ return -ENOMEM;
+
+ dma_resv_init(&obj);
+ address_space_init_once(&mapping);
+
+ mmap_read_lock(mm);
+ ww_acquire_init(&ctx, &reservation_ww_class);
+ ret = dma_resv_lock(&obj, &ctx);
+ if (ret == -EDEADLK)
+ dma_resv_lock_slow(&obj, &ctx);
+ fs_reclaim_acquire(GFP_KERNEL);
+ /* for unmap_mapping_range on trylocked buffer objects in shrinkers */
+ i_mmap_lock_write(&mapping);
+ i_mmap_unlock_write(&mapping);
+#ifdef CONFIG_MMU_NOTIFIER
+ lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
+ __dma_fence_might_wait();
+ lock_map_release(&__mmu_notifier_invalidate_range_start_map);
+#else
+ __dma_fence_might_wait();
+#endif
+ fs_reclaim_release(GFP_KERNEL);
+ ww_mutex_unlock(&obj.lock);
+ ww_acquire_fini(&ctx);
+ mmap_read_unlock(mm);
+
+ mmput(mm);
+
+ return 0;
+}
+subsys_initcall(dma_resv_lockdep);
+#endif
--
2.25.1
