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Subject[char-misc-next 2/8 RESEND] mei: revamp client connection
Date
Simplify connect state machine by changing the logic around
Connection request in progress - only check if we have a callback in
relevant queue.
Extract common code into mei_cl_send_connect() function

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
---
drivers/misc/mei/bus.c | 6 +++
drivers/misc/mei/client.c | 97 ++++++++++++++++++++++++++++++++++----------
drivers/misc/mei/client.h | 3 +-
drivers/misc/mei/interrupt.c | 43 --------------------
4 files changed, 83 insertions(+), 66 deletions(-)

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 873c1b6e45e8..00b0cb2075fb 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -436,6 +436,12 @@ int mei_cl_enable_device(struct mei_cl_device *device)

mutex_lock(&dev->device_lock);

+ if (mei_cl_is_connected(cl)) {
+ mutex_unlock(&dev->device_lock);
+ dev_warn(dev->dev, "Already connected");
+ return -EBUSY;
+ }
+
err = mei_cl_connect(cl, NULL);
if (err < 0) {
mutex_unlock(&dev->device_lock);
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index eba5fc971378..755e1e9efd0b 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -881,28 +881,83 @@ out:
*
* Return: true if other client is connected, false - otherwise.
*/
-bool mei_cl_is_other_connecting(struct mei_cl *cl)
+static bool mei_cl_is_other_connecting(struct mei_cl *cl)
{
struct mei_device *dev;
- struct mei_cl *ocl; /* the other client */
-
- if (WARN_ON(!cl || !cl->dev))
- return false;
+ struct mei_cl_cb *cb;

dev = cl->dev;

- list_for_each_entry(ocl, &dev->file_list, link) {
- if (ocl->state == MEI_FILE_CONNECTING &&
- ocl != cl &&
- cl->me_client_id == ocl->me_client_id)
+ list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) {
+ if (cb->fop_type == MEI_FOP_CONNECT &&
+ cl->me_client_id == cb->cl->me_client_id)
return true;
-
}

return false;
}

/**
+ * mei_cl_send_connect - send connect request
+ *
+ * @cl: host client
+ * @cb: callback block
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+ struct mei_device *dev;
+ int ret;
+
+ dev = cl->dev;
+
+ ret = mei_hbm_cl_connect_req(dev, cl);
+ cl->status = ret;
+ if (ret) {
+ cl->state = MEI_FILE_DISCONNECT_REPLY;
+ return ret;
+ }
+
+ list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
+ cl->timer_count = MEI_CONNECT_TIMEOUT;
+ return 0;
+}
+
+/**
+ * mei_cl_irq_connect - send connect request in irq_thread context
+ *
+ * @cl: host client
+ * @cb: callback block
+ * @cmpl_list: complete list
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
+ struct mei_cl_cb *cmpl_list)
+{
+ struct mei_device *dev = cl->dev;
+ u32 msg_slots;
+ int slots;
+ int rets;
+
+ msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
+ slots = mei_hbuf_empty_slots(dev);
+
+ if (mei_cl_is_other_connecting(cl))
+ return 0;
+
+ if (slots < msg_slots)
+ return -EMSGSIZE;
+
+ rets = mei_cl_send_connect(cl, cb);
+ if (rets)
+ list_move_tail(&cb->list, &cmpl_list->list);
+
+ return rets;
+}
+
+/**
* mei_cl_connect - connect host client to the me one
*
* @cl: host client
@@ -935,18 +990,14 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
if (rets)
goto out;

+ cl->state = MEI_FILE_CONNECTING;
+ list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+
/* run hbuf acquire last so we don't have to undo */
if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
- cl->state = MEI_FILE_CONNECTING;
- if (mei_hbm_cl_connect_req(dev, cl)) {
- rets = -ENODEV;
+ rets = mei_cl_send_connect(cl, cb);
+ if (rets)
goto out;
- }
- cl->timer_count = MEI_CONNECT_TIMEOUT;
- list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
- } else {
- cl->state = MEI_FILE_INITIALIZING;
- list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
}

mutex_unlock(&dev->device_lock);
@@ -957,20 +1008,22 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
mutex_lock(&dev->device_lock);

if (!mei_cl_is_connected(cl)) {
- /* something went really wrong */
+ /* timeout or something went really wrong */
if (!cl->status)
cl->status = -EFAULT;
- mei_cl_set_disconnected(cl);
}

rets = cl->status;
-
out:
cl_dbg(dev, cl, "rpm: autosuspend\n");
pm_runtime_mark_last_busy(dev->dev);
pm_runtime_put_autosuspend(dev->dev);

mei_io_cb_free(cb);
+
+ if (!mei_cl_is_connected(cl))
+ mei_cl_set_disconnected(cl);
+
return rets;
}

diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h
index 57ce177d5b3a..181aed992399 100644
--- a/drivers/misc/mei/client.h
+++ b/drivers/misc/mei/client.h
@@ -103,12 +103,13 @@ static inline bool mei_cl_is_connected(struct mei_cl *cl)
return cl->state == MEI_FILE_CONNECTED;
}

-bool mei_cl_is_other_connecting(struct mei_cl *cl);
int mei_cl_disconnect(struct mei_cl *cl);
void mei_cl_set_disconnected(struct mei_cl *cl);
int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
struct mei_cl_cb *cmpl_list);
int mei_cl_connect(struct mei_cl *cl, struct file *file);
+int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
+ struct mei_cl_cb *cmpl_list);
int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp);
int mei_cl_irq_read_msg(struct mei_cl *cl, struct mei_msg_hdr *hdr,
struct mei_cl_cb *cmpl_list);
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 6fd7ca9b3119..3b74e3b9b294 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -223,49 +223,6 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
return 0;
}

-
-/**
- * mei_cl_irq_connect - send connect request in irq_thread context
- *
- * @cl: client
- * @cb: callback block.
- * @cmpl_list: complete list.
- *
- * Return: 0, OK; otherwise, error.
- */
-static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
- struct mei_cl_cb *cmpl_list)
-{
- struct mei_device *dev = cl->dev;
- u32 msg_slots;
- int slots;
- int ret;
-
- msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
- slots = mei_hbuf_empty_slots(dev);
-
- if (mei_cl_is_other_connecting(cl))
- return 0;
-
- if (slots < msg_slots)
- return -EMSGSIZE;
-
- cl->state = MEI_FILE_CONNECTING;
-
- ret = mei_hbm_cl_connect_req(dev, cl);
- if (ret) {
- cl->status = ret;
- cb->buf_idx = 0;
- list_del_init(&cb->list);
- return ret;
- }
-
- list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
- cl->timer_count = MEI_CONNECT_TIMEOUT;
- return 0;
-}
-
-
/**
* mei_irq_read_handler - bottom half read routine after ISR to
* handle the read processing.
--
1.9.3


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