linux-kernel - [PATCH v2 1/1] platform/x86: asus-wmi: corrections to egpu safety check

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Date:   Wed, 30 Aug 2023 14:29:08 +1200
From:   "Luke D. Jones" <luke@...nes.dev>
To:     hdegoede@...hat.com
Cc:     corentin.chary@...il.com, markgross@...nel.org,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        "Luke D. Jones" <luke@...nes.dev>
Subject: [PATCH v2 1/1] platform/x86: asus-wmi: corrections to egpu safety check

An incorrect if statement was preventing the enablement of the egpu.

Fixes: d49f4d1a30ac ("platform/x86: asus-wmi: don't allow eGPU switching if eGPU not connected")

Signed-off-by: Luke D. Jones <luke@...nes.dev>
---
 drivers/platform/x86/asus-wmi.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 9783893d2d6e..f54178d6f780 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -726,19 +726,18 @@ static ssize_t egpu_enable_store(struct device *dev,
 		return -EINVAL;
 
 	err = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_EGPU_CONNECTED);
-	if (err < 0)
-		return err;
-	if (err < 1) {
-		err = -ENODEV;
-		pr_warn("Failed to set egpu disable: %d\n", err);
+	if (err < 0) {
+		pr_warn("Failed to get egpu connection status: %d\n", err);
 		return err;
 	}
 
 	if (asus->gpu_mux_mode_available) {
 		result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_GPU_MUX);
-		if (result < 0)
+		if (result < 0) {
 			/* An error here may signal greater failure of GPU handling */
+			pr_warn("Failed to get gpu mux status: %d\n", err);
 			return result;
+		}
 		if (!result && enable) {
 			err = -ENODEV;
 			pr_warn("Can not enable eGPU when the MUX is in dGPU mode: %d\n", err);
@@ -748,12 +747,12 @@ static ssize_t egpu_enable_store(struct device *dev,
 
 	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_EGPU, enable, &result);
 	if (err) {
-		pr_warn("Failed to set egpu disable: %d\n", err);
+		pr_warn("Failed to set egpu state: %d\n", err);
 		return err;
 	}
 
 	if (result > 1) {
-		pr_warn("Failed to set egpu disable (retval): 0x%x\n", result);
+		pr_warn("Failed to set egpu state (retval): 0x%x\n", result);
 		return -EIO;
 	}
 
-- 
2.41.0