mei: amthif: allow only one request at a time

A next amthif write can be executed only after the previous one has
completed.

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/amthif.c b/drivers/misc/mei/amthif.c
index 647edc68884f676969326062327dfa710c59d269..4383a9ad9208557aa0f2b401d5e4b1d5e9d8ba13 100644 (file)
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -315,6 +315,14 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
        dev = cl->dev;
 
        list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
+
+       /*
+        * The previous request is still in processing, queue this one.
+        */
+       if (dev->iamthif_state > MEI_IAMTHIF_IDLE &&
+           dev->iamthif_state < MEI_IAMTHIF_READ_COMPLETE)
+               return 0;
+
        return mei_amthif_run_next_cmd(dev);
 }