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

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Message-ID: <a277c632-1701-49d8-a7e0-80d28afd3a2d@oss.qualcomm.com>
Date: Mon, 19 May 2025 12:41:16 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>
To: Ekansh Gupta <ekansh.gupta@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org
Cc: gregkh@...uxfoundation.org, quic_bkumar@...cinc.com,
        linux-kernel@...r.kernel.org, quic_chennak@...cinc.com,
        dri-devel@...ts.freedesktop.org, arnd@...db.de, stable@...nel.org
Subject: Re: [PATCH v1 3/5] misc: fastrpc: Fix initial memory allocation for
 Audio PD memory pool

On 5/13/25 05:28, Ekansh Gupta wrote:
> The initially allocated memory is not properly included in the pool,
> leading to potential issues with memory management. Set the number
> 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@...nel.org
> Signed-off-by: Ekansh Gupta <ekansh.gupta@....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 is not used till the invoke call, why are we moving these two
lines here?

> +	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;