linux-kernel - [PATCH] tps6598x: clear int mask on probe failure

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Message-ID: <e6b80669-20f3-06e7-9ed5-8951a9c6db6f@kernel.dk>
Date:   Tue, 15 Feb 2022 11:22:04 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     heikki.krogerus@...ux.intel.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Sven Peter <sven@...npeter.dev>
Subject: [PATCH] tps6598x: clear int mask on probe failure

The interrupt mask is enabled before any potential failure points in
the driver, which can leave a failure path where we exit with
interrupts enabled but the device not live. This causes an infinite
stream of interrupts on an Apple M1 Pro laptop on USB-C.

Add a failure label that's used post enabling interrupts, where we
mask them again before returning an error.

Suggested-by: Sven Peter <sven@...npeter.dev>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 drivers/usb/typec/tipd/core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 6d27a5b5e3ca..7ffcda94d323 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -761,12 +761,12 @@ static int tps6598x_probe(struct i2c_client *client)
 
 	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
 	if (ret < 0)
-		return ret;
+		goto err_clear_mask;
 	trace_tps6598x_status(status);
 
 	ret = tps6598x_read32(tps, TPS_REG_SYSTEM_CONF, &conf);
 	if (ret < 0)
-		return ret;
+		goto err_clear_mask;
 
 	/*
 	 * This fwnode has a "compatible" property, but is never populated as a
@@ -855,7 +855,8 @@ static int tps6598x_probe(struct i2c_client *client)
 	usb_role_switch_put(tps->role_sw);
 err_fwnode_put:
 	fwnode_handle_put(fwnode);
-
+err_clear_mask:
+	tps6598x_write64(tps, TPS_REG_INT_MASK1, 0);
 	return ret;
 }
 
-- 
2.34.1

-- 
Jens Axboe