linux-kernel - [PATCH v2] extcon: usbc-tusb320: Call the Type-C IRQ handler only if a port is registered

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Date:   Mon,  7 Nov 2022 18:33:17 +0300
From:   Yassine Oudjana <yassine.oudjana@...il.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marek Vasut <marex@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yassine Oudjana <yassine.oudjana@...il.com>,
        Yassine Oudjana <y.oudjana@...tonmail.com>
Subject: [PATCH v2] extcon: usbc-tusb320: Call the Type-C IRQ handler only if a port is registered

From: Yassine Oudjana <y.oudjana@...tonmail.com>

Commit bf7571c00dca ("extcon: usbc-tusb320: Add USB TYPE-C support")
added an optional Type-C interface to the driver but missed to check
if it is in use when calling the IRQ handler. This causes an oops on
devices currently using the old extcon interface. Check if a Type-C
port is registered before calling the Type-C IRQ handler.

Fixes: bf7571c00dca ("extcon: usbc-tusb320: Add USB TYPE-C support")
Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>
Reviewed-by: Marek Vasut <marex@...x.de>
---
Changes since v1:
- Drop "for backward compatibility" from comment to avoid confusion on
  whether Type-C is meant to be the old or new interface.

 drivers/extcon/extcon-usbc-tusb320.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
index 41041ff0fadb..2a120d8d3c27 100644
--- a/drivers/extcon/extcon-usbc-tusb320.c
+++ b/drivers/extcon/extcon-usbc-tusb320.c
@@ -327,7 +327,13 @@ static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
 		return IRQ_NONE;
 
 	tusb320_extcon_irq_handler(priv, reg);
-	tusb320_typec_irq_handler(priv, reg);
+
+	/*
+	 * Type-C support is optional. Only call the Type-C handler if a
+	 * port had been registered previously.
+	 */
+	if (priv->port)
+		tusb320_typec_irq_handler(priv, reg);
 
 	regmap_write(priv->regmap, TUSB320_REG9, reg);
 
-- 
2.38.1