[v4] Add missing features to FastRPC driver

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

Posted by Ekansh Gupta 1 year, 6 months ago

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@kernel.org>
Signed-off-by: Ekansh Gupta <quic_ekangupt@quicinc.com>
---
 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);
-- 
2.43.0

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

Posted by Caleb Connolly 1 year, 6 months ago


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@kernel.org>
> Signed-off-by: Ekansh Gupta <quic_ekangupt@quicinc.com>

Reviewed-by: Caleb Connolly <caleb.connolly@linaro.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)

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

Posted by Dmitry Baryshkov 1 year, 6 months ago

On Thu, Jun 06, 2024 at 10:29:24PM +0530, 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.

Nit: Imperative style, please.

Something like: 'Don't change process's PD type for this request'

> 
> Fixes: 6c16fd8bdd40 ("misc: fastrpc: Add support to get DSP capabilities")
> Cc: stable <stable@kernel.org>
> Signed-off-by: Ekansh Gupta <quic_ekangupt@quicinc.com>
> ---
>  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);
> -- 
> 2.43.0
> 

-- 
With best wishes
Dmitry