[PATCH] drm/dp_mst: fix drm_dp_dpcd_read return value checks

[Simon Ser]

drm_dp_dpcd_read returns the number of bytes read. The previous code
would print garbage on DPCD error, and would exit with on error on
success.

Signed-off-by: Simon Ser <contact at emersion.fr>
Fixes: cb897542c6d2 ("drm/dp_mst: Fix W=1 warnings")
Cc: Lyude Paul <lyude at redhat.com>
Cc: Benjamin Gaignard <benjamin.gaignard at st.com>
---
 drivers/gpu/drm/dp/drm_dp_mst_topology.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/dp/drm_dp_mst_topology.c b/drivers/gpu/drm/dp/drm_dp_mst_topology.c
index 11300b53d24f..f5998b7cf602 100644
--- a/drivers/gpu/drm/dp/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/dp/drm_dp_mst_topology.c
@@ -4912,21 +4912,21 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 		int ret;
 
 		ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
-		if (ret) {
+		if (ret != DP_RECEIVER_CAP_SIZE) {
 			seq_printf(m, "dpcd read failed\n");
 			goto out;
 		}
 		seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
 
 		ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
-		if (ret) {
+		if (ret != 2) {
 			seq_printf(m, "faux/mst read failed\n");
 			goto out;
 		}
 		seq_printf(m, "faux/mst: %*ph\n", 2, buf);
 
 		ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
-		if (ret) {
+		if (ret != 1) {
 			seq_printf(m, "mst ctrl read failed\n");
 			goto out;
 		}
@@ -4934,7 +4934,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 
 		/* dump the standard OUI branch header */
 		ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
-		if (ret) {
+		if (ret != DP_BRANCH_OUI_HEADER_SIZE) {
 			seq_printf(m, "branch oui read failed\n");
 			goto out;
 		}

base-commit: ded74cafeea9311c1eaf6fccce963de2516145f7
-- 
2.35.1