linux-kernel - [PATCH 1/2] platform/chrome: cros_typec

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Message-Id: <20230104060846.112216-1-pmalani@chromium.org>
Date:   Wed,  4 Jan 2023 06:08:44 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev
Cc:     Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>
Subject: [PATCH 1/2] platform/chrome: cros_typec_switch: Use fwnode* prop check

Using device_property_present() multiple times on an ACPI device
leads to kernel panics on Chromebook systems. This happens when there
is > 1 boolean property in an ACPI device which is created dynamically
by the BIOS as part of SSDT[1] on Chromebook systems

Since fwnode_* can handle simple device tree properties equally
well, switch to using the fwnode_property_present() function
version. This will avoid panics and make the usage consistent
when we introduce a check for the 2nd property in a subsequent patch.

[1] https://wiki.osdev.org/SSDT

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_typec_switch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c
index a26219e97c93..2536bda03bf3 100644
--- a/drivers/platform/chrome/cros_typec_switch.c
+++ b/drivers/platform/chrome/cros_typec_switch.c
@@ -254,7 +254,7 @@ static int cros_typec_register_switches(struct cros_typec_switch_data *sdata)
 
 		dev_dbg(dev, "Retimer switch registered for index %llu\n", index);
 
-		if (!device_property_present(fwnode->dev, "mode-switch"))
+		if (!fwnode_property_present(fwnode, "mode-switch"))
 			continue;
 
 		ret = cros_typec_register_mode_switch(port, fwnode);
-- 
2.39.0.314.g84b9a713c41-goog