On Mon, 19 Mar 2018, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> 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.
>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Pushed to drm-misc-next, thanks for the patch!
BR,
Jani.
> ---
> - use macro for buffer length on stack
>
> drivers/gpu/drm/drm_dp_mst_topology.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 6fac4129e6a2..658830620ca3 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2941,12 +2941,14 @@ 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)
> @@ -3015,7 +3017,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
>
> mutex_lock(&mgr->lock);
> if (mgr->mst_primary) {
> - u8 buf[64];
> + u8 buf[DP_PAYLOAD_TABLE_SIZE];
> int ret;
>
> ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
> @@ -3033,8 +3035,7 @@ 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);
--
Jani Nikula, Intel Open Source Technology Center
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