linux-kernel - [PATCH v9 03/17] platform/x86: dell-wmi: clean up wmi descriptor check

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Message-Id: <fee4013581cad412769a00c4b12eb8037c89e127.1508259916.git.mario.limonciello@dell.com>
Date:   Tue, 17 Oct 2017 13:21:47 -0500
From:   Mario Limonciello <mario.limonciello@...l.com>
To:     dvhart@...radead.org, Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>, quasisec@...gle.com,
        pali.rohar@...il.com, rjw@...ysocki.net, mjg59@...gle.com,
        hch@....de, Greg KH <greg@...ah.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Mario Limonciello <mario.limonciello@...l.com>
Subject: [PATCH v9 03/17] platform/x86: dell-wmi: clean up wmi descriptor check

Some cases the wrong type was used for errors and checks can be
done more cleanly.

Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
Reviewed-by: Edward O'Callaghan <quasisec@...gle.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/platform/x86/dell-wmi.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index 2cfaaa8faf0a..ece2fe341f01 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -663,19 +663,19 @@ static int dell_wmi_check_descriptor_buffer(struct wmi_device *wdev)
 
 	buffer = (u32 *)obj->buffer.pointer;
 
-	if (buffer[0] != 0x4C4C4544 && buffer[1] != 0x494D5720) {
-		dev_err(&wdev->dev, "Dell descriptor buffer has invalid signature (%*ph)\n",
-			8, buffer);
+	if (strncmp(obj->string.pointer, "DELL WMI", 8) != 0) {
+		dev_err(&wdev->dev, "Dell descriptor buffer has invalid signature (%8ph)\n",
+			buffer);
 		ret = -EINVAL;
 		goto out;
 	}
 
 	if (buffer[2] != 0 && buffer[2] != 1)
-		dev_warn(&wdev->dev, "Dell descriptor buffer has unknown version (%d)\n",
+		dev_warn(&wdev->dev, "Dell descriptor buffer has unknown version (%u)\n",
 			buffer[2]);
 
 	if (buffer[3] != 4096)
-		dev_warn(&wdev->dev, "Dell descriptor buffer has invalid buffer length (%d)\n",
+		dev_warn(&wdev->dev, "Dell descriptor buffer has invalid buffer length (%u)\n",
 			buffer[3]);
 
 	priv->interface_version = buffer[2];
-- 
2.14.1