linux-kernel - Re: [PATCH] misc: fastrpc: add ioctl for attaching to sensors pd

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Date:   Mon, 7 Sep 2020 14:33:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     linux-arm-msm@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] misc: fastrpc: add ioctl for attaching to sensors pd

On Mon, Aug 31, 2020 at 08:32:59PM -0400, Jonathan Marek wrote:
> Initializing sensors requires attaching to pd 2. Add an ioctl for that.
> 
> This corresponds to FASTRPC_INIT_ATTACH_SENSORS in the downstream driver.
> 
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>  drivers/misc/fastrpc.c      | 9 ++++++---
>  include/uapi/misc/fastrpc.h | 5 +++--
>  2 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index 7939c55daceb..ea5e9ca0d705 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -1276,7 +1276,7 @@ static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
>  	return 0;
>  }
>  
> -static int fastrpc_init_attach(struct fastrpc_user *fl)
> +static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
>  {
>  	struct fastrpc_invoke_args args[1];
>  	int tgid = fl->tgid;
> @@ -1287,7 +1287,7 @@ static int fastrpc_init_attach(struct fastrpc_user *fl)
>  	args[0].fd = -1;
>  	args[0].reserved = 0;
>  	sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
> -	fl->pd = 0;
> +	fl->pd = pd;
>  
>  	return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
>  				       sc, &args[0]);
> @@ -1477,7 +1477,10 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
>  		err = fastrpc_invoke(fl, argp);
>  		break;
>  	case FASTRPC_IOCTL_INIT_ATTACH:
> -		err = fastrpc_init_attach(fl);
> +		err = fastrpc_init_attach(fl, 0);
> +		break;
> +	case FASTRPC_IOCTL_INIT_ATTACH_SNS:
> +		err = fastrpc_init_attach(fl, 2);

Shouldn't you have #defines for those magic numbers somewhere?  What
does 0 and 2 mean?

thanks,

greg k-h