mei: don't get stuck in select during reset

Clear pending connection after hw reset but before hw start
and wake up the waiting task in poll. Signal POLLERR in select
when device went through reset.

Add wrapper mei_cl_is_connected for checking if
the device and client are connected.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 7929e14627ba..557eed2a1595 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -149,12 +149,20 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
         dev->hbm_state = MEI_HBM_IDLE;
 
         if (dev->dev_state != MEI_DEV_INITIALIZING) {
+
                 if (dev->dev_state != MEI_DEV_DISABLED &&
                     dev->dev_state != MEI_DEV_POWER_DOWN)
                         dev->dev_state = MEI_DEV_RESETTING;
 
+
+                /* remove all waiting requests */
+                mei_cl_all_write_clear(dev);
+
                 mei_cl_all_disconnect(dev);
 
+                /* wake up all readings so they can be interrupted */
+                mei_cl_all_wakeup(dev);
+
                 /* remove entry if already in list */
                 dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
                 mei_cl_unlink(&dev->wd_cl);
@@ -195,11 +203,6 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
 
         mei_hbm_start_req(dev);
 
-        /* wake up all readings so they can be interrupted */
-        mei_cl_all_wakeup(dev);
-
-        /* remove all waiting requests */
-        mei_cl_all_write_clear(dev);
 }
 EXPORT_SYMBOL_GPL(mei_reset);