i8k: Stop reading SMM BIOS version during driver probe

This doesn't work on Studio, XPS, Vostro, and Precision laptops,
and it doesn't provide any value except to cause confusion when
it does not work. Drop it and always use DMI BIOS version instead.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 889b87bf4629ac2072042958de0f2002e0e31679..216b6900bdc8ca9520e3bbb707f340d59d083bbf 100644 (file)
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -44,7 +44,6 @@
 #define I8K_SMM_GET_TEMP       0x10a3
 #define I8K_SMM_GET_DELL_SIG1  0xfea3
 #define I8K_SMM_GET_DELL_SIG2  0xffa3
-#define I8K_SMM_BIOS_VERSION   0x00a6
 
 #define I8K_FAN_MULT           30
 #define I8K_MAX_TEMP           127
@@ -207,17 +206,6 @@ out:
        return rc;
 }
 
-/*
- * Read the bios version. Return the version as an integer corresponding
- * to the ascii value, for example "A17" is returned as 0x00413137.
- */
-static int i8k_get_bios_version(void)
-{
-       struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
-
-       return i8k_smm(&regs) ? : regs.eax;
-}
-
 /*
  * Read the Fn key status.
  */
@@ -355,7 +343,8 @@ i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
 
        switch (cmd) {
        case I8K_BIOS_VERSION:
-               val = i8k_get_bios_version();
+               val = (bios_version[0] << 16) |
+                               (bios_version[1] << 8) | bios_version[2];
                break;
 
        case I8K_MACHINE_ID:
@@ -717,8 +706,6 @@ static struct dmi_system_id i8k_dmi_table[] __initdata = {
  */
 static int __init i8k_probe(void)
 {
-       char buff[4];
-       int version;
        const struct dmi_system_id *id;
 
        /*
@@ -748,31 +735,6 @@ static int __init i8k_probe(void)
                        return -ENODEV;
        }
 
-       /*
-        * Get SMM BIOS version.
-        */
-       version = i8k_get_bios_version();
-       if (version <= 0) {
-               pr_warn("unable to get SMM BIOS version\n");
-       } else {
-               buff[0] = (version >> 16) & 0xff;
-               buff[1] = (version >> 8) & 0xff;
-               buff[2] = (version) & 0xff;
-               buff[3] = '\0';
-               /*
-                * If DMI BIOS version is unknown use SMM BIOS version.
-                */
-               if (!dmi_get_system_info(DMI_BIOS_VERSION))
-                       strlcpy(bios_version, buff, sizeof(bios_version));
-
-               /*
-                * Check if the two versions match.
-                */
-               if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
-                       pr_warn("BIOS version mismatch: %s != %s\n",
-                               buff, bios_version);
-       }
-
        i8k_fan_mult = fan_mult;
        id = dmi_first_match(i8k_dmi_table);
        if (id && fan_mult == I8K_FAN_MULT && id->driver_data)