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[1/2] serial: sh-sci: Use pm_runtime_get_sync()/put() on suspend

Message ID 1523638854-21804-2-git-send-email-ulrich.hecht+renesas@gmail.com (mailing list archive)
State Superseded
Delegated to: Geert Uytterhoeven
Headers show

Commit Message

Ulrich Hecht April 13, 2018, 5 p.m. UTC 
From: Hien Dang <hien.dang.eb@renesas.com>

Since commit '39dd0f234fc37d ("PM / Domains: Allow runtime PM during system
PM phases")', runtime PM may be in suspended state when the module
registers are backed up. It is therefore necessary to ensure the device is
on during suspend by using pm_runtime_get_sync()/pm_runtime_put().

Signed-off-by: Hien Dang <hien.dang.eb@renesas.com>
Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
[uli: edited description for clarity]
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
---
 drivers/tty/serial/sh-sci.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index fdbbff5..22d7a78 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -3246,8 +3246,11 @@  static __maybe_unused int sci_suspend(struct device *dev)
 {
 	struct sci_port *sport = dev_get_drvdata(dev);
 
-	if (sport)
+	if (sport) {
+		pm_runtime_get_sync(sport->port.dev);
 		uart_suspend_port(&sci_uart_driver, &sport->port);
+		pm_runtime_put(sport->port.dev);
+	}
 
 	return 0;
 }