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authorAlexander Usyskin <alexander.usyskin@intel.com>2014-08-21 14:29:19 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-23 22:57:48 -0700
commitcb02efc3a6e96a0dc4aba8ebf0c1136b72fbe8ba (patch)
treedd60c108aece5a5ba0e6af58c8a8217d45c2835c
parent12f45ed414c8d2eac1a98bf2deaf4117e8c0324f (diff)
downloadlinux-cb02efc3a6e96a0dc4aba8ebf0c1136b72fbe8ba.tar.gz
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>
-rw-r--r--drivers/misc/mei/hbm.c26
-rw-r--r--drivers/misc/mei/hbm.h6
-rw-r--r--drivers/misc/mei/init.c2
-rw-r--r--drivers/misc/mei/mei_dev.h2
4 files changed, 22 insertions, 14 deletions
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index cda914191a2f..2968b52fc12a 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -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;
diff --git a/drivers/misc/mei/hbm.h b/drivers/misc/mei/hbm.h
index 683eb2835cec..80920f096c04 100644
--- a/drivers/misc/mei/hbm.h
+++ b/drivers/misc/mei/hbm.h
@@ -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,
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 73ccbb65d4ff..9f635be684ea 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -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;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 0922ce867d47..79124ae6a249 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -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;
/*