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OpenCloudOS-Kernel
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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>
This commit is contained in:
Alexander Usyskin 2014-08-21 14:29:19 +03:00 committed by Greg Kroah-Hartman
parent 12f45ed414
commit cb02efc3a6
4 changed files with 22 additions and 14 deletions
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26
drivers/misc/mei/hbm.c
View File

@ -172,21 +172,27 @@ bool mei_hbm_cl_addr_equal(struct mei_cl *cl, void *buf)
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 @@ int mei_hbm_start_req(struct mei_device *dev)
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 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
}
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 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
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 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
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;

6
drivers/misc/mei/hbm.h
View File

@ -25,13 +25,15 @@ struct mei_cl;
* 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,

2
drivers/misc/mei/init.c
View File

@ -360,7 +360,7 @@ void mei_device_init(struct mei_device *dev, const struct mei_cfg *cfg)
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;

2
drivers/misc/mei/mei_dev.h
View File

@ -443,7 +443,7 @@ struct mei_device {
*/
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;
/*