[PATCH v1 3/5] misc: fastrpc: Fix initial memory allocation for Audio PD memory pool

[Ekansh Gupta]

On 5/19/2025 3:47 PM, Dmitry Baryshkov wrote:
> On Tue, May 13, 2025 at 09:58:23AM +0530, Ekansh Gupta wrote:
>> The initially allocated memory is not properly included in the pool,
>> leading to potential issues with memory management. Set the number
> What is 'properly'? Which issues?

inbuf.pageslen is getting updated to 1 in case buffer is allocated, which only
happens if (!fl->cctx->audio_init_mem).

Till now pageslen is always 0 irrespective of whether the memory is allocated
or not due to which audio PD is never able to use this memory.

I'll update this to the commit in the next spin.

>
>> of pages to one to ensure that the initially allocated memory is
>> correctly added to the Audio PD memory pool.
>>
>> Fixes: 0871561055e66 ("misc: fastrpc: Add support for audiopd")
>> Cc: stable at kernel.org
>> Signed-off-by: Ekansh Gupta <ekansh.gupta at oss.qualcomm.com>
>> ---
>>  drivers/misc/fastrpc.c | 7 ++++---
>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
>> index d4e38b5e5e6c..b629e24f00bc 100644
>> --- a/drivers/misc/fastrpc.c
>> +++ b/drivers/misc/fastrpc.c
>> @@ -1311,6 +1311,9 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
>>  		goto err;
>>  	}
>>  
>> +	inbuf.client_id = fl->client_id;
>> +	inbuf.namelen = init.namelen;
>> +	inbuf.pageslen = 0;
>>  	if (!fl->cctx->audio_init_mem) {
>>  		err = fastrpc_remote_heap_alloc(fl, fl->sctx->dev, init.memlen,
>>  						&buf);
>> @@ -1335,12 +1338,10 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
>>  			list_add_tail(&buf->node, &fl->cctx->rhmaps);
>>  			spin_unlock_irqrestore(&fl->cctx->lock, flags);
>>  			fl->cctx->audio_init_mem = true;
>> +			inbuf.pageslen = 1;
>>  		}
>>  	}
>>  
>> -	inbuf.client_id = fl->client_id;
>> -	inbuf.namelen = init.namelen;
>> -	inbuf.pageslen = 0;
>>  	fl->pd = USER_PD;
>>  
>>  	args[0].ptr = (u64)(uintptr_t)&inbuf;
>> -- 
>> 2.34.1
>>