linux-kernel - [char-misc-next 02/11] mei: request autosuspend at the end of write

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Message-Id: <1431003248-3164-2-git-send-email-tomas.winkler@intel.com>
Date:	Thu,  7 May 2015 15:53:59 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	Alexander Usyskin <alexander.usyskin@...el.com>,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 02/11] mei: request autosuspend at the end of write

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

On longer non-blocking write might not complete at the end of
autosuspend expiration, therefore we request autosuspend
again on the write completion.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/client.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index ce88c2199b2c..7a5a6636f0fd 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1459,12 +1459,18 @@ err:
  */
 void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
 {
+	struct mei_device *dev = cl->dev;
+
 	switch (cb->fop_type) {
 	case MEI_FOP_WRITE:
 		mei_io_cb_free(cb);
 		cl->writing_state = MEI_WRITE_COMPLETE;
-		if (waitqueue_active(&cl->tx_wait))
+		if (waitqueue_active(&cl->tx_wait)) {
 			wake_up_interruptible(&cl->tx_wait);
+		} else {
+			pm_runtime_mark_last_busy(dev->dev);
+			pm_request_autosuspend(dev->dev);
+		}
 		break;
 
 	case MEI_FOP_READ:
-- 
2.1.0

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