linux-kernel - [PATCH 2/3] usb: typec: ps883x: fix missing accessibility check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250218152933.22992-3-johan+linaro@kernel.org>
Date: Tue, 18 Feb 2025 16:29:32 +0100
From: Johan Hovold <johan+linaro@...nel.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Abel Vesa <abel.vesa@...aro.org>,
	Stephan Gerhold <stephan.gerhold@...aro.org>,
	linux-arm-msm@...r.kernel.org,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 2/3] usb: typec: ps883x: fix missing accessibility check

Make sure that the retimer is accessible before registering to avoid
having later consumer calls fail to configure it, something which, for
example, can lead to a hotplugged display not being recognised:

	[drm:msm_dp_panel_read_sink_caps [msm]] *ERROR* read dpcd failed -110

Fixes: 257a087c8b52 ("usb: typec: Add support for Parade PS8830 Type-C Retimer")
Cc: Abel Vesa <abel.vesa@...aro.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/usb/typec/mux/ps883x.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/usb/typec/mux/ps883x.c b/drivers/usb/typec/mux/ps883x.c
index 274de7abe585..f8b47187f4cf 100644
--- a/drivers/usb/typec/mux/ps883x.c
+++ b/drivers/usb/typec/mux/ps883x.c
@@ -291,6 +291,7 @@ static int ps883x_retimer_probe(struct i2c_client *client)
 	struct typec_switch_desc sw_desc = { };
 	struct typec_retimer_desc rtmr_desc = { };
 	struct ps883x_retimer *retimer;
+	unsigned int val;
 	int ret;
 
 	retimer = devm_kzalloc(dev, sizeof(*retimer), GFP_KERNEL);
@@ -360,6 +361,16 @@ static int ps883x_retimer_probe(struct i2c_client *client)
 
 		/* firmware initialization delay */
 		msleep(60);
+
+		/* make sure device is accessible */
+		ret = regmap_read(retimer->regmap, REG_USB_PORT_CONN_STATUS_0,
+				  &val);
+		if (ret) {
+			dev_err(dev, "failed to read conn_status_0: %d\n", ret);
+			if (ret == -ENXIO)
+				ret = -EIO;
+			goto err_clk_disable;
+		}
 	}
 
 	sw_desc.drvdata = retimer;
-- 
2.45.3