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clear-pkgs-linux-iot-lts2018/1108-media-ipu4-VIRT-Fix-fo...

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: "Yew, Chang Ching" <chang.ching.yew@intel.com>
Date: Tue, 30 Apr 2019 02:22:24 +0000
Subject: [PATCH] media: ipu4: [VIRT] Fix for race condition in
handle_vq_kick()
Race condition is observed with 2:2 sos:aaag cpu allocation with req->stat checking in handle_vq_kick()
This req->stat checking is removed to avoid such race condition
Change-Id: I2c6f3b6f64538664e1dd53bc260900303f59b1bb
Tracked-On: PKT-2287
Tracked-On: ACI-5773
Signed-off-by: Yew, Chang Ching <chang.ching.yew@intel.com>
Signed-off-by: Junhao Gao <junhao.gao@intel.com>
---
.../virtio/intel-ipu4-virtio-be-bridge.c | 30 +------------------
.../pci/intel/virtio/intel-ipu4-virtio-be.c | 8 +----
2 files changed, 2 insertions(+), 36 deletions(-)
diff --git a/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be-bridge.c b/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be-bridge.c
index 27f8631..19ffac6 100644
--- a/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be-bridge.c
+++ b/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be-bridge.c
@@ -49,7 +49,6 @@ int intel_ipu4_virtio_msg_parse(struct ipu4_virtio_req_info *req_info)
__func__, req->op[0]);
kthread_run(process_poll_thread, req_info,
"process_poll");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_DEVICE_OPEN:
/*
@@ -60,7 +59,6 @@ int intel_ipu4_virtio_msg_parse(struct ipu4_virtio_req_info *req_info)
pr_debug("DEVICE_OPEN: virtual_dev_id:%d actual_fd:%d\n", req->op[0], req->op[1]);
kthread_run(process_device_open_thread, req_info,
"process_device_open");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_DEVICE_CLOSE:
/*
@@ -71,7 +69,6 @@ int intel_ipu4_virtio_msg_parse(struct ipu4_virtio_req_info *req_info)
pr_debug("DEVICE_CLOSE: virtual_dev_id:%d actual_fd:%d\n", req->op[0], req->op[1]);
kthread_run(process_device_close_thread, req_info,
"process_device_close");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_STREAM_ON:
/* Start Stream
@@ -81,7 +78,6 @@ int intel_ipu4_virtio_msg_parse(struct ipu4_virtio_req_info *req_info)
pr_debug("STREAM ON: virtual_dev_id:%d actual_fd:%d\n", req->op[0], req->op[1]);
kthread_run(process_stream_on_thread, req_info,
"process_stream_on");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_STREAM_OFF:
/* Stop Stream
@@ -91,7 +87,6 @@ int intel_ipu4_virtio_msg_parse(struct ipu4_virtio_req_info *req_info)
pr_debug("STREAM OFF: virtual_dev_id:%d actual_fd:%d\n", req->op[0], req->op[1]);
kthread_run(process_stream_off_thread, req_info,
"process_stream_off");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_GET_BUF:
/* Set Format of a given video node
@@ -107,7 +102,6 @@ int intel_ipu4_virtio_msg_parse(struct ipu4_virtio_req_info *req_info)
__func__, req->op[0]);
kthread_run(process_get_buf_thread, req_info,
"process_get_buf");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PUT_BUF:
/* Set Format of a given video node
@@ -119,165 +113,143 @@ int intel_ipu4_virtio_msg_parse(struct ipu4_virtio_req_info *req_info)
__func__, req->op[0]);
kthread_run(process_put_buf_thread, req_info,
"process_put_buf");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_SET_FORMAT:
pr_debug("%s process_set_format %d",
__func__, req->op[0]);
kthread_run(process_set_format_thread, req_info,
"process_set_format");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PIPELINE_OPEN:
pr_debug("%s process_pipeline_open %d",
__func__, req->op[0]);
kthread_run(process_pipeline_open_thread, req_info,
"process_pipeline_open");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PIPELINE_CLOSE:
pr_debug("%s process_pipeline_close %d",
__func__, req->op[0]);
kthread_run(process_pipeline_close_thread, req_info,
"process_pipeline_close");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_ENUM_NODES:
pr_debug("%s process_enum_nodes %d",
__func__, req->op[0]);
kthread_run(process_enum_nodes_thread, req_info,
"process_enum_nodes");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_ENUM_LINKS:
pr_debug("%s process_enum_links %d",
__func__, req->op[0]);
kthread_run(process_enum_links_thread, req_info,
"process_enum_links");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_SETUP_PIPE:
pr_debug("%s process_setup_pipe %d",
__func__, req->op[0]);
kthread_run(process_setup_pipe_thread, req_info,
"process_setup_pipe");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_SET_FRAMEFMT:
pr_debug("%s process_set_framefmt %d",
__func__, req->op[0]);
kthread_run(process_set_framefmt_thread, req_info,
"process_set_framefmt");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_GET_FRAMEFMT:
pr_debug("%s process_get_framefmt %d",
__func__, req->op[0]);
kthread_run(process_get_framefmt_thread, req_info,
"process_get_framefmt");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_GET_SUPPORTED_FRAMEFMT:
pr_debug("%s process_get_supported_framefmt %d",
__func__, req->op[0]);
kthread_run(process_get_supported_framefmt_thread,
req_info, "process_get_supported_framefmt");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_SET_SELECTION:
pr_debug("%s process_pad_set_sel %d",
__func__, req->op[0]);
kthread_run(process_pad_set_sel_thread, req_info,
"process_pad_set_sel");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_GET_SELECTION:
pr_debug("%s process_pad_get_sel %d",
__func__, req->op[0]);
kthread_run(process_pad_get_sel_thread, req_info,
"process_pad_get_sel");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_MAPBUF:
pr_debug("%s process_psys_mapbuf_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_mapbuf_thread, req_info,
"process_psys_mapbuf_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_UNMAPBUF:
pr_debug("%s process_psys_unmapbuf_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_unmapbuf_thread, req_info,
"process_psys_unmapbuf_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_QUERYCAP:
pr_debug("%s process_psys_querycap_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_querycap_thread, req_info,
"process_psys_querycap_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_GETBUF:
pr_debug("%s process_psys_getbuf_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_getbuf_thread, req_info,
"process_psys_getbuf_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_PUTBUF:
pr_debug("%s process_psys_putbuf_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_putbuf_thread, req_info,
"process_psys_putbuf_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_QCMD:
pr_debug("%s process_psys_qcmd_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_qcmd_thread, req_info,
"process_psys_qcmd_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_DQEVENT:
pr_debug("%s process_psys_dqevent_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_dqevent_thread, req_info,
"process_psys_dqevent_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_GET_MANIFEST:
pr_debug("%s process_psys_get_manifest_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_get_manifest_thread, req_info,
"process_psys_get_manifest_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_OPEN:
pr_debug("%s process_psys_open_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_open_thread, req_info,
"process_psys_open_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_CLOSE:
pr_debug("%s process_psys_close_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_close_thread, req_info,
"process_psys_close_thread");
- req->stat = IPU4_REQ_PENDING;
break;
case IPU4_CMD_PSYS_POLL:
pr_debug("%s process_psys_poll_thread %d",
__func__, req->op[0]);
kthread_run(process_psys_poll_thread, req_info,
"process_psys_poll_thread");
- req->stat = IPU4_REQ_PENDING;
break;
default:
return -EINVAL;
}
+ req->stat = IPU4_REQ_PENDING;
return ret;
}
diff --git a/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be.c b/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be.c
index c29294b..a4b950a 100644
--- a/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be.c
+++ b/drivers/media/pci/intel/virtio/intel-ipu4-virtio-be.c
@@ -209,17 +209,11 @@ static void handle_vq_kick(int client_id, int vq_idx)
virtio_vq_relchain(vq, idx, iov.iov_len);
continue;
}
-
- if (req->stat != IPU4_REQ_PENDING) {
- virtio_vq_relchain(vq, idx, iov.iov_len);
- ipu4_virtio_be_req_queue_put(req_info);
- }
pr_debug("%s ending request for stream %d",
__func__, req->op[0]);
}
pr_debug("IPU VBK data process on VQ Done\n");
- if ((req == NULL) || (req && req->stat !=
- IPU4_REQ_PENDING))
+ if (req == NULL)
virtio_vq_endchains(vq, 1);
}
--
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