linux-kernel - [PATCH v9 1/5] serdev: Make .remove in struct serdev_device

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Message-Id: <20171025190421.18415-2-andrew.smirnov@gmail.com>
Date:   Wed, 25 Oct 2017 12:04:17 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-serial@...r.kernel.org, Rob Herring <robh@...nel.org>,
        cphealy@...il.com, Guenter Roeck <linux@...ck-us.net>,
        Lucas Stach <l.stach@...gutronix.de>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Lee Jones <lee.jones@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pavel Machek <pavel@....cz>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH v9 1/5] serdev: Make .remove in struct serdev_device_driver optional

Using devres infrastructure it is possible to write a serdev driver
that doesn't have any code that needs to be called as a part of
.remove. Add code to make .remove optional.

Cc: linux-kernel@...r.kernel.org
Cc: linux-serial@...r.kernel.org
Cc: Rob Herring <robh@...nel.org>
Cc: cphealy@...il.com
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Nikita Yushchenko <nikita.yoush@...entembedded.com>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Pavel Machek <pavel@....cz>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Johan Hovold <johan@...nel.org>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
---
 drivers/tty/serdev/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index c68fb3a8ea1c..f500f6a2ca88 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -252,8 +252,8 @@ static int serdev_drv_probe(struct device *dev)
 static int serdev_drv_remove(struct device *dev)
 {
 	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
-
-	sdrv->remove(to_serdev_device(dev));
+	if (sdrv->remove)
+		sdrv->remove(to_serdev_device(dev));
 	return 0;
 }
 
-- 
2.13.5