linux-kernel - [PATCH 1/2] platform/chrome: cros_ec_typec: Use workqueue for port update

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Message-Id: <20200627045840.1314019-1-pmalani@chromium.org>
Date:   Fri, 26 Jun 2020 21:58:39 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     heikki.krogerus@...ux.intel.com,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: [PATCH 1/2] platform/chrome: cros_ec_typec: Use workqueue for port update

Use a work queue to call the port update routines, instead of doing it
directly in the PD notifier callback. This will prevent other drivers
with PD notifier callbacks from being blocked on the port update routine
completing.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 28 ++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 0c041b79cbba..630170fb2cbe 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -58,6 +58,7 @@ struct cros_typec_data {
 	/* Array of ports, indexed by port number. */
 	struct cros_typec_port *ports[EC_USB_PD_MAX_PORTS];
 	struct notifier_block nb;
+	struct work_struct port_work;
 };
 
 static int cros_typec_parse_port_props(struct typec_capability *cap,
@@ -619,18 +620,29 @@ static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
 	return 0;
 }
 
-static int cros_ec_typec_event(struct notifier_block *nb,
-			       unsigned long host_event, void *_notify)
+static void cros_typec_port_work(struct work_struct *work)
 {
-	struct cros_typec_data *typec = container_of(nb, struct cros_typec_data,
-						     nb);
-	int ret, i;
+	struct cros_typec_data *typec = container_of(work,
+						     struct cros_typec_data,
+						     port_work);
+	int ret;
+	int i;
 
 	for (i = 0; i < typec->num_ports; i++) {
 		ret = cros_typec_port_update(typec, i);
 		if (ret < 0)
 			dev_warn(typec->dev, "Update failed for port: %d\n", i);
 	}
+}
+
+
+static int cros_ec_typec_event(struct notifier_block *nb,
+			       unsigned long host_event, void *_notify)
+{
+	struct cros_typec_data *typec = container_of(nb, struct cros_typec_data,
+						     nb);
+
+	schedule_work(&typec->port_work);
 
 	return NOTIFY_OK;
 }
@@ -689,6 +701,12 @@ static int cros_typec_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
+	INIT_WORK(&typec->port_work, cros_typec_port_work);
+
+	/*
+	 * Safe to call port update here, since we haven't registered the
+	 * PD notifier yet.
+	 */
 	for (i = 0; i < typec->num_ports; i++) {
 		ret = cros_typec_port_update(typec, i);
 		if (ret < 0)
-- 
2.27.0.212.ge8ba1cc988-goog