linux-kernel - [PATCH 5.4 039/309] usb: typec: tcpci: mask event interrupts when remove driver

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Message-Id: <20200210122409.849294785@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:29:55 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Li Jun <jun.li@....com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 5.4 039/309] usb: typec: tcpci: mask event interrupts when remove driver

From: Jun Li <jun.li@....com>

commit 3ba76256fc4e2a0d7fb26cc95459041ea0e88972 upstream.

This is to prevent any possible events generated while unregister
tpcm port.

Fixes: 74e656d6b055 ("staging: typec: Type-C Port Controller Interface driver (tcpci)")
Signed-off-by: Li Jun <jun.li@....com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Link: https://lore.kernel.org/r/1579502333-4145-1-git-send-email-jun.li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/typec/tcpm/tcpci.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -591,6 +591,12 @@ static int tcpci_probe(struct i2c_client
 static int tcpci_remove(struct i2c_client *client)
 {
 	struct tcpci_chip *chip = i2c_get_clientdata(client);
+	int err;
+
+	/* Disable chip interrupts before unregistering port */
+	err = tcpci_write16(chip->tcpci, TCPC_ALERT_MASK, 0);
+	if (err < 0)
+		return err;
 
 	tcpci_unregister_port(chip->tcpci);