From 1f16ee7fa13649f4e55aa48ad31c3eb0722a62d3 Mon Sep 17 00:00:00 2001 From: Mykola Lysenko Date: Fri, 18 Dec 2015 17:14:43 -0500 Subject: [PATCH] drm/dp/mst: always send reply for UP request We should always send reply for UP request in order to make downstream device clean-up resources appropriately. Issue was that reply for UP request was sent only once. Acked-by: Dave Airlie Signed-off-by: Mykola Lysenko Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org --- drivers/gpu/drm/drm_dp_mst_topology.c | 30 ++++++++++----------------- include/drm/drm_dp_mst_helper.h | 2 -- 2 files changed, 11 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 7710de6e8a55..ca92a3217465 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1494,26 +1494,18 @@ static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) } /* called holding qlock */ -static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) +static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_tx *txmsg) { - struct drm_dp_sideband_msg_tx *txmsg; int ret; /* construct a chunk from the first msg in the tx_msg queue */ - if (list_empty(&mgr->tx_msg_upq)) { - mgr->tx_up_in_progress = false; - return; - } - - txmsg = list_first_entry(&mgr->tx_msg_upq, struct drm_dp_sideband_msg_tx, next); ret = process_single_tx_qlock(mgr, txmsg, true); - if (ret == 1) { - /* up txmsgs aren't put in slots - so free after we send it */ - list_del(&txmsg->next); - kfree(txmsg); - } else if (ret) + + if (ret != 1) DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); - mgr->tx_up_in_progress = true; + + txmsg->dst->tx_slots[txmsg->seqno] = NULL; } static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, @@ -1907,11 +1899,12 @@ static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, drm_dp_encode_up_ack_reply(txmsg, req_type); mutex_lock(&mgr->qlock); - list_add_tail(&txmsg->next, &mgr->tx_msg_upq); - if (!mgr->tx_up_in_progress) { - process_single_up_tx_qlock(mgr); - } + + process_single_up_tx_qlock(mgr, txmsg); + mutex_unlock(&mgr->qlock); + + kfree(txmsg); return 0; } @@ -2843,7 +2836,6 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, mutex_init(&mgr->qlock); mutex_init(&mgr->payload_lock); mutex_init(&mgr->destroy_connector_lock); - INIT_LIST_HEAD(&mgr->tx_msg_upq); INIT_LIST_HEAD(&mgr->tx_msg_downq); INIT_LIST_HEAD(&mgr->destroy_connector_list); INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index 74b5888bbc73..4fc55a87dfee 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -451,9 +451,7 @@ struct drm_dp_mst_topology_mgr { the mstb tx_slots and txmsg->state once they are queued */ struct mutex qlock; struct list_head tx_msg_downq; - struct list_head tx_msg_upq; bool tx_down_in_progress; - bool tx_up_in_progress; /* payload info + lock for it */ struct mutex payload_lock; -- 2.39.5