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mei: bus: fix notification event delivery 

Call wake_up cl->ev_wait only in case there is no bus client registered
to the event notification.
Second, since we don't have exclusive waiter wake_up_interruptible_all
is not used correctly here.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2016-02-07 23:35:31 +02:00 committed by Greg Kroah-Hartman
parent a1f9ae2bd2
commit 850f8940a6
3 changed files with 12 additions and 7 deletions
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13
drivers/misc/mei/bus.c
View File

@ -230,25 +230,30 @@ static void mei_cl_bus_event_work(struct work_struct *work)
* mei_cl_bus_notify_event - schedule notify cb on bus client
*
* @cl: host client
*
* Return: true if event was scheduled
* false if the client is not waiting for event
*/
void mei_cl_bus_notify_event(struct mei_cl *cl)
bool mei_cl_bus_notify_event(struct mei_cl *cl)
{
struct mei_cl_device *cldev = cl->cldev;
if (!cldev || !cldev->event_cb)
return;
return false;
if (!(cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)))
return;
return false;
if (!cl->notify_ev)
return;
return false;
set_bit(MEI_CL_EVENT_NOTIF, &cldev->events);
schedule_work(&cldev->event_work);
cl->notify_ev = false;
return true;
}
/**

4
drivers/misc/mei/client.c
View File

@ -1363,12 +1363,12 @@ void mei_cl_notify(struct mei_cl *cl)
cl_dbg(dev, cl, "notify event");
cl->notify_ev = true;
wake_up_interruptible_all(&cl->ev_wait);
if (!mei_cl_bus_notify_event(cl))
wake_up_interruptible(&cl->ev_wait);
if (cl->ev_async)
kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);
mei_cl_bus_notify_event(cl);
}
/**

2
drivers/misc/mei/mei_dev.h
View File

@ -317,7 +317,7 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
bool blocking);
ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
bool mei_cl_bus_rx_event(struct mei_cl *cl);
void mei_cl_bus_notify_event(struct mei_cl *cl);
bool mei_cl_bus_notify_event(struct mei_cl *cl);
void mei_cl_bus_remove_devices(struct mei_device *bus);
int mei_cl_bus_init(void);
void mei_cl_bus_exit(void);