Re: [RFC PATCH v7 12/13] dma-buf: system_heap: Allocate shared buffers using CoCo shared memory allocator

[Aneesh Kumar K.V <aneesh.kumar@kernel.org>]

Catalin Marinas <catalin.marinas@arm.com> writes:

> On Mon, Sep 21, 2026 at 08:18:46PM +0530, Aneesh Kumar K.V (Arm) wrote:
>> @@ -405,6 +396,7 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap,
>>  {
>>  	struct system_heap_buffer *buffer;
>>  	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
>> +	struct cc_shared_layout layout;
>>  	unsigned long size_remaining = len;
>>  	unsigned long sg_remaining = len;
>>  	unsigned int max_order = orders[0];
>> @@ -417,6 +409,14 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap,
>>  	struct page *page, *tmp_page;
>>  	int i, ret = -ENOMEM;
>>  
>> +	if (cc_shared) {
>> +		ret = cc_shared_calc_layout(len, &layout);
>
> You should not override 'ret' here, it was set to -ENOMEM for a reason.
> cc_shared_calc_layout() succeeds resetting 'ret' and some further down
> allocation failure, goto free will return ERR_PTR(0).


Agreed. I’ll fix this in the next revision.

-aneesh