Handle any error due to partial reads, timeouts etc. to avoid parsing
uninitialized data subsequently. Also bail out if the parsing itself
fails.
CC: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index a13edf5..12c0ab3 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2204,11 +2204,19 @@ static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
replyblock, len);
if (ret != len) {
- DRM_DEBUG_KMS("failed to read a chunk\n");
+ DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
+ len, ret);
+
+ return;
}
+
ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
- if (ret == false)
+ if (!ret) {
DRM_DEBUG_KMS("failed to build sideband msg\n");
+
+ return;
+ }
+
curreply += len;
replylen -= len;
}
--
2.5.0
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