mei: wait for hbm start non-interruptible
We cannot handle user interrupt in context of hbm start
so we only wait for time out which is reasonably short.
1. Add kdoc
2. Rename state to better reflect its function
3. Simplify wait condition and rename
wait_recvd_msg to wait_hbm_start
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index cda9141..2968b52 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -172,21 +172,27 @@
cl->me_client_id == cmd->me_addr;
}
-
+/**
+ * mei_hbm_start_wait - wait for start response message.
+ *
+ * @dev: the device structure
+ *
+ * returns 0 on success and < 0 on failure
+ */
int mei_hbm_start_wait(struct mei_device *dev)
{
int ret;
- if (dev->hbm_state > MEI_HBM_START)
+
+ if (dev->hbm_state > MEI_HBM_STARTING)
return 0;
mutex_unlock(&dev->device_lock);
- ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
- dev->hbm_state == MEI_HBM_IDLE ||
- dev->hbm_state >= MEI_HBM_STARTED,
+ ret = wait_event_timeout(dev->wait_hbm_start,
+ dev->hbm_state != MEI_HBM_STARTING,
mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
mutex_lock(&dev->device_lock);
- if (ret <= 0 && (dev->hbm_state <= MEI_HBM_START)) {
+ if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
dev->hbm_state = MEI_HBM_IDLE;
dev_err(&dev->pdev->dev, "waiting for mei start failed\n");
return -ETIME;
@@ -227,7 +233,7 @@
return ret;
}
- dev->hbm_state = MEI_HBM_START;
+ dev->hbm_state = MEI_HBM_STARTING;
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
return 0;
}
@@ -726,7 +732,7 @@
}
if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
- dev->hbm_state != MEI_HBM_START) {
+ dev->hbm_state != MEI_HBM_STARTING) {
dev_err(&dev->pdev->dev, "hbm: start: state mismatch, [%d, %d]\n",
dev->dev_state, dev->hbm_state);
return -EPROTO;
@@ -739,7 +745,7 @@
return -EIO;
}
- wake_up_interruptible(&dev->wait_recvd_msg);
+ wake_up(&dev->wait_hbm_start);
break;
case CLIENT_CONNECT_RES_CMD:
@@ -866,7 +872,7 @@
dev_dbg(&dev->pdev->dev, "hbm: stop request: message received\n");
dev->hbm_state = MEI_HBM_STOPPED;
if (mei_hbm_stop_req(dev)) {
- dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
+ dev_err(&dev->pdev->dev, "hbm: stop request: failed to send stop request\n");
return -EIO;
}
break;
diff --git a/drivers/misc/mei/hbm.h b/drivers/misc/mei/hbm.h
index 683eb28..80920f0 100644
--- a/drivers/misc/mei/hbm.h
+++ b/drivers/misc/mei/hbm.h
@@ -25,13 +25,15 @@
* enum mei_hbm_state - host bus message protocol state
*
* @MEI_HBM_IDLE : protocol not started
- * @MEI_HBM_START : start request message was sent
+ * @MEI_HBM_STARTING : start request message was sent
+ * @MEI_HBM_STARTED : start reply message was received
* @MEI_HBM_ENUM_CLIENTS : enumeration request was sent
* @MEI_HBM_CLIENT_PROPERTIES : acquiring clients properties
+ * @MEI_HBM_STOPPED : stopping exchange
*/
enum mei_hbm_state {
MEI_HBM_IDLE = 0,
- MEI_HBM_START,
+ MEI_HBM_STARTING,
MEI_HBM_STARTED,
MEI_HBM_ENUM_CLIENTS,
MEI_HBM_CLIENT_PROPERTIES,
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 73ccbb6..9f635be 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -360,7 +360,7 @@
mutex_init(&dev->device_lock);
init_waitqueue_head(&dev->wait_hw_ready);
init_waitqueue_head(&dev->wait_pg);
- init_waitqueue_head(&dev->wait_recvd_msg);
+ init_waitqueue_head(&dev->wait_hbm_start);
init_waitqueue_head(&dev->wait_stop_wd);
dev->dev_state = MEI_DEV_INITIALIZING;
dev->reset_count = 0;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 0922ce8..79124ae 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -443,7 +443,7 @@
*/
wait_queue_head_t wait_hw_ready;
wait_queue_head_t wait_pg;
- wait_queue_head_t wait_recvd_msg;
+ wait_queue_head_t wait_hbm_start;
wait_queue_head_t wait_stop_wd;
/*