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@xxxxxxxxxxx>
Fixes: cb897542c6d2 ("drm/dp_mst: Fix W=1 warnings")
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxx>
---
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
