linux-kernel - Re: [PATCH] misc: fastrpc: Update number of max fastrpc sessions

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Date:   Mon, 20 Sep 2021 09:51:18 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jeya R <jeyr@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, srinivas.kandagatla@...aro.org,
        linux-kernel@...r.kernel.org, fastrpc.upstream@....qualcomm.com
Subject: Re: [PATCH] misc: fastrpc: Update number of max fastrpc sessions

On Mon, Sep 20, 2021 at 01:04:34PM +0530, Jeya R wrote:
> For latest chipsets, upto 13 fastrpc sessions can be
> supported. This includes 12 compute sessions and 1 cpz
> session. Not updating this might result to out of bounds
> memory access issues if more than 9 context bank nodes
> are added to the DT file.
> 
> Signed-off-by: Jeya R <jeyr@...eaurora.org>
> ---
>  drivers/misc/fastrpc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index beda610..bd7811e 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -24,7 +24,7 @@
>  #define SDSP_DOMAIN_ID (2)
>  #define CDSP_DOMAIN_ID (3)
>  #define FASTRPC_DEV_MAX		4 /* adsp, mdsp, slpi, cdsp*/
> -#define FASTRPC_MAX_SESSIONS	9 /*8 compute, 1 cpz*/
> +#define FASTRPC_MAX_SESSIONS	13 /*12 compute, 1 cpz*/
>  #define FASTRPC_ALIGN		128
>  #define FASTRPC_MAX_FDLIST	16
>  #define FASTRPC_MAX_CRCLIST	64
> -- 
> 2.7.4
> 

What happens if you run this on "older" chipsets?

And is this an issue now, or can this wait to 5.16-rc1?

thanks,

greg k-h