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gpu: ion: Leave fmem in c-state until unsecured

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When the last buffer is freed from a heap that uses fmem we call
into fmem to transition the memory from c-state to t-state. However,
if the heap has been secured for content protection transitioning
the memory from c-state to t-state could cause undefined behavior
in fmem.

Add checks to ensure that a secured heap will not transition to
t-state until heap is unsecured.

Change-Id: I672274c8bcb9912652e82588941fe840b08b3473
CRs-fixed: 359593
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
This commit is contained in:
Olav Haugan
2012-05-17 17:50:43 -07:00
committed by Stephen Boyd
parent 772ffb6355
commit 7490707829
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/ion/ion_cp_heap.c
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@@ -247,7 +247,8 @@ ion_phys_addr_t ion_cp_allocate(struct ion_heap *heap,
cp_heap->total_size -
cp_heap->allocated_bytes, size);
if (cp_heap->reusable && !cp_heap->allocated_bytes) {
if (cp_heap->reusable && !cp_heap->allocated_bytes &&
cp_heap->heap_protected == HEAP_NOT_PROTECTED) {
if (fmem_set_state(FMEM_T_STATE) != 0)
pr_err("%s: unable to transition heap to T-state\n",
__func__);
@@ -296,7 +297,8 @@ void ion_cp_free(struct ion_heap *heap, ion_phys_addr_t addr,
mutex_lock(&cp_heap->lock);
cp_heap->allocated_bytes -= size;
if (cp_heap->reusable && !cp_heap->allocated_bytes) {
if (cp_heap->reusable && !cp_heap->allocated_bytes &&
cp_heap->heap_protected == HEAP_NOT_PROTECTED) {
if (fmem_set_state(FMEM_T_STATE) != 0)
pr_err("%s: unable to transition heap to T-state\n",
__func__);