mei: vsc: Call wake_up() in the threaded IRQ handler

The hard IRQ handler vsc_tp_irq() is called with a raw spinlock taken.
wake_up() acquires a spinlock, a sleeping lock on PREEMPT_RT. This leads
to sleeping in atomic context.

Move the wake_up() call to the threaded IRQ handler vsc_tp_thread_isr()
where it can be safely called.

Fixes: 566f5ca ("mei: Add transport driver for IVSC device")
Signed-off-by: Sakari Ailus <[email protected]>
Tested-and-Reviewed-by: Wentong Wu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Sakari Ailus

drivers/misc/mei/vsc-tp.c

@@ -416,15 +416,15 @@ static irqreturn_t vsc_tp_isr(int irq, void *data)
 
 	atomic_inc(&tp->assert_cnt);
 
-	wake_up(&tp->xfer_wait);
-
 	return IRQ_WAKE_THREAD;
 }
 
 static irqreturn_t vsc_tp_thread_isr(int irq, void *data)
 {
 	struct vsc_tp *tp = data;
 
+	wake_up(&tp->xfer_wait);
+
 	if (tp->event_notify)
 		tp->event_notify(tp->event_notify_context);