mei: request autosuspend after sending rx flow control

commit bbf0a94744edfeee298e4a9ab6fd694d639a5cdf upstream.

A rx flow control waiting in the control queue may block autosuspend.
Re-request autosuspend after flow control been sent to unblock
the transition to the low power state.

Cc: <stable@vger.kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20210526193334.445759-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index c70a8c74cc57a1a04beb893ae69730e0e3b6f3ba..a70d989032c19c0545c8c4351347a168a58ecdc8 100644 (file)
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -222,6 +222,9 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
                return ret;
        }
 
+       pm_runtime_mark_last_busy(dev->dev);
+       pm_request_autosuspend(dev->dev);
+
        list_move_tail(&cb->list, &cl->rd_pending);
 
        return 0;