linux-kernel - Re: [PATCH v4 04/11] misc: fastrpc: Avoid updating PD type for capability request

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Message-ID: <4ac692bf-55d5-4a66-acda-72353d817de4@linaro.org>
Date: Fri, 7 Jun 2024 14:43:40 +0200
From: Caleb Connolly <caleb.connolly@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>, srinivas.kandagatla@...aro.org,
 linux-arm-msm@...r.kernel.org
Cc: gregkh@...uxfoundation.org, quic_bkumar@...cinc.com,
 linux-kernel@...r.kernel.org, quic_chennak@...cinc.com,
 stable <stable@...nel.org>
Subject: Re: [PATCH v4 04/11] misc: fastrpc: Avoid updating PD type for
 capability request



On 06/06/2024 18:59, Ekansh Gupta wrote:
> When user is requesting for DSP capability, the process pd type is
> getting updated to USER_PD which is incorrect as DSP will assume the
> process which is making the request is a user PD and this will never
> get updated back to the original value. The actual PD type should not
> be updated for capability request and it should be serviced by the
> respective PD on DSP side. Adding changes to avoid process PD type
> modification.
> 
> Fixes: 6c16fd8bdd40 ("misc: fastrpc: Add support to get DSP capabilities")
> Cc: stable <stable@...nel.org>
> Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>

Reviewed-by: Caleb Connolly <caleb.connolly@...aro.org>
> ---
>   drivers/misc/fastrpc.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index f64781c3012f..abdd35b7c3ad 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -1703,7 +1703,6 @@ static int fastrpc_get_info_from_dsp(struct fastrpc_user *fl, uint32_t *dsp_attr
>   	args[1].ptr = (u64)(uintptr_t)&dsp_attr_buf[1];
>   	args[1].length = dsp_attr_buf_len * sizeof(u32);
>   	args[1].fd = -1;
> -	fl->pd = USER_PD;
>   
>   	return fastrpc_internal_invoke(fl, true, FASTRPC_DSP_UTILITIES_HANDLE,
>   				       FASTRPC_SCALARS(0, 1, 1), args);

-- 
// Caleb (they/them)