linux-kernel - [PATCH 4.4 46/56] serial: omap: suspend device on probe errors

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Message-Id: <20170518104842.352416417@linuxfoundation.org>
Date:   Thu, 18 May 2017 12:49:03 +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, Shubhrajyoti D <shubhrajyoti@...com>,
        Johan Hovold <johan@...nel.org>,
        Tony Lindgren <tony@...mide.com>
Subject: [PATCH 4.4 46/56] serial: omap: suspend device on probe errors

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit 77e6fe7fd2b7cba0bf2f2dc8cde51d7b9a35bf74 upstream.

Make sure to actually suspend the device before returning after a failed
(or deferred) probe.

Note that autosuspend must be disabled before runtime pm is disabled in
order to balance the usage count due to a negative autosuspend delay as
well as to make the final put suspend the device synchronously.

Fixes: 388bc2622680 ("omap-serial: Fix the error handling in the omap_serial probe")
Cc: Shubhrajyoti D <shubhrajyoti@...com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/omap-serial.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1712,7 +1712,8 @@ static int serial_omap_probe(struct plat
 	return 0;
 
 err_add_port:
-	pm_runtime_put(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
+	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	pm_qos_remove_request(&up->pm_qos_request);
 	device_init_wakeup(up->dev, false);