[PATCH v7 07/15] platform/x86: dell-smbios: only run if proper oem string is detected

[Mario Limonciello]

The proper way to indicate that a system is a 'supported' Dell System
is by the presence of this string in OEM strings.

Allowing the driver to load on non-Dell systems will have undefined
results.

Signed-off-by: Mario Limonciello <mario.limoncie...@dell.com>
---
 drivers/platform/x86/dell-smbios.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/x86/dell-smbios.c 
b/drivers/platform/x86/dell-smbios.c
index e9b1ca07c872..7e779278d054 100644
--- a/drivers/platform/x86/dell-smbios.c
+++ b/drivers/platform/x86/dell-smbios.c
@@ -172,8 +172,15 @@ static void __init find_tokens(const struct dmi_header 
*dm, void *dummy)
 
 static int __init dell_smbios_init(void)
 {
+       const struct dmi_device *valid;
        int ret;
 
+       valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL);
+       if (!valid) {
+               pr_err("Unable to run on non-Dell system\n");
+               return -ENODEV;
+       }
+
        dmi_walk(find_tokens, NULL);
 
        if (!da_tokens)  {
-- 
2.14.1