linux-kernel - [PATCH 4.4 11/54] mei: request autosuspend after sending rx flow control

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Message-Id: <20210531130635.447787259@linuxfoundation.org>
Date:   Mon, 31 May 2021 15:13:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [PATCH 4.4 11/54] mei: request autosuspend after sending rx flow control

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

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@...r.kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Link: https://lore.kernel.org/r/20210526193334.445759-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/mei/interrupt.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -220,6 +220,9 @@ static int mei_cl_irq_read(struct mei_cl
 		return ret;
 	}
 
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_request_autosuspend(dev->dev);
+
 	list_move_tail(&cb->list, &cl->rd_pending);
 
 	return 0;