mei: add read callback on demand for fixed_address clients

The Fixed address clients do not work with the flow control, and the
packet RX callback was allocated upon TX with anticipation of a
following RX. This won't work if the clients with unsolicited Rx. Rather
than preparing read callback upon a write we allocate one directly on
the reciev path if one doesn't exists.

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/client.c b/drivers/misc/mei/client.c
index 6658917..2a09db8 100644 (file)
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1145,26 +1145,19 @@ err:
  * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
  *
  * @cl: host client
- * @fp: the file pointer associated with the pointer
  *
  * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
  */
-static int mei_cl_flow_ctrl_creds(struct mei_cl *cl, const struct file *fp)
+static int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
 {
-       int rets;
-
        if (WARN_ON(!cl || !cl->me_cl))
                return -EINVAL;
 
        if (cl->mei_flow_ctrl_creds > 0)
                return 1;
 
-       if (mei_cl_is_fixed_address(cl)) {
-               rets = mei_cl_read_start(cl, mei_cl_mtu(cl), fp);
-               if (rets && rets != -EBUSY)
-                       return rets;
+       if (mei_cl_is_fixed_address(cl))
                return 1;
-       }
 
        if (mei_cl_is_single_recv_buf(cl)) {
                if (cl->me_cl->mei_flow_ctrl_creds > 0)
@@ -1537,7 +1530,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 
        first_chunk = cb->buf_idx == 0;
 
-       rets = first_chunk ? mei_cl_flow_ctrl_creds(cl, cb->fp) : 1;
+       rets = first_chunk ? mei_cl_flow_ctrl_creds(cl) : 1;
        if (rets < 0)
                return rets;
 
@@ -1643,7 +1636,7 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
        mei_hdr.msg_complete = 0;
        mei_hdr.internal = cb->internal;
 
-       rets = mei_cl_flow_ctrl_creds(cl, cb->fp);
+       rets = mei_cl_flow_ctrl_creds(cl);
        if (rets < 0)
                goto err;
 

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 8b5e4b4..44ba901 100644 (file)
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -107,8 +107,14 @@ int mei_cl_irq_read_msg(struct mei_cl *cl,
 
        cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
        if (!cb) {
-               cl_err(dev, cl, "pending read cb not found\n");
-               goto out;
+               if (!mei_cl_is_fixed_address(cl)) {
+                       cl_err(dev, cl, "pending read cb not found\n");
+                       goto out;
+               }
+               cb = mei_cl_alloc_cb(cl, mei_cl_mtu(cl), MEI_FOP_READ, cl->fp);
+               if (!cb)
+                       goto out;
+               list_add_tail(&cb->list, &cl->rd_pending);
        }
 
        if (!mei_cl_is_connected(cl)) {