staging: unisys: visornic: correct visornic_pause

Correct visornic_pause() to indicate completion asynchronously rather
than in-line

Previously, visornic_pause() (called to stop the device due to IOVM service
partition recovery) was calling the passed complete_func() in-line, rather
than delaying the calling until after the device had actually been stopped.

The behavior has been corrected so that the calling of the complete_func()
is now delayed until after the stopping of the device has been completed in
visornic_serverdown_complete(), which runs asynchronously via the workqueue
visornic_serverdown_workqueue.

Signed-off-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c
index 7100744..fa52e0f 100644 (file)
--- a/drivers/staging/unisys/visornic/visornic_main.c
+++ b/drivers/staging/unisys/visornic/visornic_main.c
@@ -151,6 +151,7 @@ struct visornic_devdata {
                                          * sent to the IOPART end
                                          */
        struct work_struct serverdown_completion;
+       visorbus_state_complete_func server_down_complete_func;
        struct work_struct timeout_reset;
        struct uiscmdrsp *cmdrsp_rcv;    /* cmdrsp_rcv is used for
                                          * posting/unposting rcv buffers
@@ -545,8 +546,12 @@ visornic_serverdown_complete(struct work_struct *work)
        atomic_set(&devdata->num_rcvbuf_in_iovm, 0);
        spin_unlock_irqrestore(&devdata->priv_lock, flags);
 
+       if (devdata->server_down_complete_func)
+               (*devdata->server_down_complete_func)(devdata->dev, 0);
+
        devdata->server_down = true;
        devdata->server_change_state = false;
+       devdata->server_down_complete_func = NULL;
 }
 
 /**
@@ -558,10 +563,12 @@ visornic_serverdown_complete(struct work_struct *work)
  *     Returns 0 if we scheduled the work, -EINVAL on error.
  */
 static int
-visornic_serverdown(struct visornic_devdata *devdata)
+visornic_serverdown(struct visornic_devdata *devdata,
+                   visorbus_state_complete_func complete_func)
 {
        if (!devdata->server_down && !devdata->server_change_state) {
                devdata->server_change_state = true;
+               devdata->server_down_complete_func = complete_func;
                queue_work(visornic_serverdown_workqueue,
                           &devdata->serverdown_completion);
        } else if (devdata->server_change_state) {
@@ -895,7 +902,7 @@ visornic_timeout_reset(struct work_struct *work)
        return;
 
 call_serverdown:
-       visornic_serverdown(devdata);
+       visornic_serverdown(devdata, NULL);
 }
 
 /**
@@ -1980,8 +1987,7 @@ static int visornic_pause(struct visor_device *dev,
 {
        struct visornic_devdata *devdata = dev_get_drvdata(&dev->device);
 
-       visornic_serverdown(devdata);
-       complete_func(dev, 0);
+       visornic_serverdown(devdata, complete_func);
        return 0;
 }