linux-kernel - [PATCH 09/19] serdev: Provide modalias uevent for modalias devices

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Message-Id: <20180529131014.18641-10-ricardo.ribalda@gmail.com>
Date:   Tue, 29 May 2018 15:10:04 +0200
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Rob Herring <robh@...nel.org>, Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Subject: [PATCH 09/19] serdev: Provide modalias uevent for modalias devices

Create the sysfs uevent for modalias devices. This is required by newer
versions of udev for autoload modules.

Cc: Rob Herring <robh@...nel.org>
Cc: Johan Hovold <johan@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/tty/serdev/core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index a9c935f68076..9414700e6442 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -46,6 +46,7 @@ ATTRIBUTE_GROUPS(serdev_device);
 static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
 	int rc;
+	struct serdev_device *serdev = to_serdev_device(dev);
 
 	/* TODO: platform modalias */
 
@@ -53,7 +54,11 @@ static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 	if (rc != -ENODEV)
 		return rc;
 
-	return of_device_uevent_modalias(dev, env);
+	if (rc != of_device_uevent_modalias(dev, env))
+		return rc;
+
+	return add_uevent_var(env, "MODALIAS=%s%s", SERDEV_MODULE_PREFIX,
+						    serdev->modalias);
 }
 
 static void serdev_device_release(struct device *dev)
-- 
2.17.0