linux-kernel - [PATCH 5.15 124/139] tps6598x: clear int mask on probe failure

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Message-Id: <20220228172400.668857813@linuxfoundation.org>
Date:   Mon, 28 Feb 2022 18:24:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sven Peter <sven@...npeter.dev>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.15 124/139] tps6598x: clear int mask on probe failure

From: Jens Axboe <axboe@...nel.dk>

commit aba2081e0a9c977396124aa6df93b55ed5912b19 upstream.

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>
Cc: stable <stable@...r.kernel.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Link: https://lore.kernel.org/r/e6b80669-20f3-06e7-9ed5-8951a9c6db6f@kernel.dk
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/typec/tipd/core.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -618,12 +618,12 @@ static int tps6598x_probe(struct i2c_cli
 
 	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
@@ -712,7 +712,8 @@ err_role_put:
 	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;
 }