RE: [PATCH] drm/dp_mst: Correct the bug in drm_dp_update_payload_part1()

["Liu, Zhan" <Zhan.Liu@xxxxxxx>]

> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Wayne Lin
> Sent: 2019/December/01, Sunday 10:59 PM
> To: dri-devel@xxxxxxxxxxxxxxxxxxxxx; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Zuo, Jerry <Jerry.Zuo@xxxxxxx>; Wentland, Harry
> <Harry.Wentland@xxxxxxx>; Kazlauskas, Nicholas
> <Nicholas.Kazlauskas@xxxxxxx>; Lin, Wayne <Wayne.Lin@xxxxxxx>
> Subject: [PATCH] drm/dp_mst: Correct the bug in
> drm_dp_update_payload_part1()
> 
> [Why]
> If the payload_state is DP_PAYLOAD_DELETE_LOCAL in series, current code
> doesn't delete the payload at current index and just move the index to next
> one after shuffling payloads.
> 
> [How]
> After shuffling payloads, decide whether to move on index or not according
> to payload_state of current payload.
> 
> Signed-off-by: Wayne Lin <Wayne.Lin@xxxxxxx>


Reviewed-by: Zhan Liu <zhan.liu@xxxxxxx>


> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 81e92b260d7a..8da5d461ea01 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -3176,7 +3176,8 @@ int drm_dp_update_payload_part1(struct
> drm_dp_mst_topology_mgr *mgr)
>  			drm_dp_mst_topology_put_port(port);
>  	}
> 
> -	for (i = 0; i < mgr->max_payloads; i++) {
> +	for (i = 0; i < mgr->max_payloads;
> +		(mgr->payloads[i].payload_state ==
> DP_PAYLOAD_DELETE_LOCAL) ? i :
> +i++) {
>  		if (mgr->payloads[i].payload_state !=
> DP_PAYLOAD_DELETE_LOCAL)
>  			continue;
> 
> --
> 2.17.1
> 
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