linux-kernel - [PATCH v2] platform/x86: ideapad-laptop: Set max

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Date:   Tue, 14 Nov 2023 11:38:08 +0000
From:   Stuart Hayhurst <stuart.a.hayhurst@...il.com>
To:     platform-driver-x86@...r.kernel.org
Cc:     Stuart Hayhurst <stuart.a.hayhurst@...il.com>,
        linux-kernel@...r.kernel.org, Mark Gross <markgross@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Ike Panhc <ike.pan@...onical.com>, stable@...r.kernel.org
Subject: [PATCH v2] platform/x86: ideapad-laptop: Set max_brightness before using it

max_brightness is used in ideapad_kbd_bl_brightness_get() before it's set,
causing ideapad_kbd_bl_brightness_get() to return -EINVAL sometimes

Fixes: ecaa1867b524 ("platform/x86: ideapad-laptop: Add support for keyboard backlights using KBLC ACPI symbol")
Signed-off-by: Stuart Hayhurst <stuart.a.hayhurst@...il.com>
Cc: stable@...r.kernel.org
---

Sorry if I messed up the stable cc bit, I have no idea how that process works

v1 -> v2:
 - Fix commit message
 - Add missing tags

---
 drivers/platform/x86/ideapad-laptop.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index ac037540acfc..88eefccb6ed2 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -1425,18 +1425,17 @@ static int ideapad_kbd_bl_init(struct ideapad_private *priv)
 	if (WARN_ON(priv->kbd_bl.initialized))
 		return -EEXIST;
 
-	brightness = ideapad_kbd_bl_brightness_get(priv);
-	if (brightness < 0)
-		return brightness;
-
-	priv->kbd_bl.last_brightness = brightness;
-
 	if (ideapad_kbd_bl_check_tristate(priv->kbd_bl.type)) {
 		priv->kbd_bl.led.max_brightness = 2;
 	} else {
 		priv->kbd_bl.led.max_brightness = 1;
 	}
 
+	brightness = ideapad_kbd_bl_brightness_get(priv);
+	if (brightness < 0)
+		return brightness;
+
+	priv->kbd_bl.last_brightness = brightness;
 	priv->kbd_bl.led.name                    = "platform::" LED_FUNCTION_KBD_BACKLIGHT;
 	priv->kbd_bl.led.brightness_get          = ideapad_kbd_bl_led_cdev_brightness_get;
 	priv->kbd_bl.led.brightness_set_blocking = ideapad_kbd_bl_led_cdev_brightness_set;
-- 
2.42.0