From: Lyude Paul <lyude@redhat.com>
To: dri-devel@lists.freedesktop.org
Cc: Wayne Lin <Wayne.Lin@amd.com>, Wayne Lin <waynelin@amd.com>,
Sean Paul <seanpaul@chromium.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
linux-kernel@vger.kernel.org
Subject: [PATCH] drm/dp_mst: Don't drop NAKs for down responses
Date: Fri, 3 Apr 2020 16:03:25 -0400 [thread overview]
Message-ID: <20200403200325.885628-1-lyude@redhat.com> (raw)
It looks like that when we introduced the ability to handle multiple
down requests at once, we accidentally started dropping NAK replies -
causing sideband messages which got NAK'd to seemingly timeout and cause
all sorts of weirdness.
So, fix this by making sure we don't return from
drm_dp_mst_handle_down_rep() early, but instead treat NAKs like any
other message.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: fbc821c4a506 ("drm/mst: Support simultaneous down replies")
Cc: Wayne Lin <Wayne.Lin@amd.com>
Cc: Wayne Lin <waynelin@amd.com>
Cc: Sean Paul <seanpaul@chromium.org>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 10d0315af513..5449ada3e019 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3813,7 +3813,6 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
txmsg->reply.u.nak.reason,
drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),
txmsg->reply.u.nak.nak_data);
- goto out_clear_reply;
}
memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx));
--
2.25.1
next reply other threads:[~2020-04-03 20:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-03 20:03 Lyude Paul [this message]
2020-04-06 19:50 ` [PATCH] drm/dp_mst: Don't drop NAKs for down responses Sean Paul
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