linux-kernel - [char-misc-next] mei: request autosuspend after sending rx flow control

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Message-Id: <20210526193334.445759-1-tomas.winkler@intel.com>
Date:   Wed, 26 May 2021 22:33:34 +0300
From:   Tomas Winkler <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next] mei: request autosuspend after sending rx flow control

From: Alexander Usyskin <alexander.usyskin@...el.com>

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@...r.kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/interrupt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index a98f6b895af7..aab3ebfa9fc4 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -277,6 +277,9 @@ 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;
-- 
2.31.1