drm/dp/mst: Fix off-by-one typo when dump payload table

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@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180319141932.37290-1-andriy.shevchenko@linux.intel.com

1 files 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);