[PATCH v1] drm/dp/mst: Fix off-by-one typo when dump payload table

[Andy Shevchenko]

On Thu, 2018-01-11 at 17:33 +0200, Andy Shevchenko wrote:
> It seems there is a classical off-by-one typo from the beginning
> when commit
> 
>   ad7f8a1f9ced ("drm/helper: add Displayport multi-stream helper
> (v0.6)")
> 
> introduced a new helper.
> 
> Fix a typo by introducing a macro constant.

Any comment on this?

> 
> Cc: Dave Airlie <airlied at redhat.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 70dcfa58d3c2..51c5fc11f852 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2936,12 +2936,14 @@ static void drm_dp_mst_dump_mstb(struct
> seq_file *m,
>  	}
>  }
>  
> +#define DP_PAYLOAD_TABLE_SIZE		64
> +
>  static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr
> *mgr,
>  				  char *buf)
>  {
>  	int i;
>  
> -	for (i = 0; i < 64; i += 16) {
> +	for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) {
>  		if (drm_dp_dpcd_read(mgr->aux,
>  				     DP_PAYLOAD_TABLE_UPDATE_STATUS +
> i,
>  				     &buf[i], 16) != 16)
> @@ -3028,8 +3030,7 @@ void drm_dp_mst_dump_topology(struct seq_file
> *m,
>  		seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
>  			   buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa],
> buf[0xb]);
>  		if (dump_dp_payload_table(mgr, buf))
> -			seq_printf(m, "payload table: %*ph\n", 63,
> buf);
> -
> +			seq_printf(m, "payload table: %*ph\n",
> DP_PAYLOAD_TABLE_SIZE, buf);
>  	}
>  
>  	mutex_unlock(&mgr->lock);

-- 
Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Intel Finland Oy