[ACPI] fix EC access width

http://bugzilla.kernel.org/show_bug.cgi?id=4346

Written-by: David Shaohua Li and Luming Yu
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 69b04d4..e371622 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -600,7 +600,7 @@ acpi_ec_space_handler (
 {
        int                     result = 0;
        struct acpi_ec          *ec = NULL;
-       u32                     temp = 0;
+       u64                     temp = *value;
        acpi_integer            f_v = 0;
        int                     i = 0;
 
@@ -609,10 +609,9 @@ acpi_ec_space_handler (
        if ((address > 0xFF) || !value || !handler_context)
                return_VALUE(AE_BAD_PARAMETER);
 
-       if(bit_width != 8) {
+       if (bit_width != 8 && acpi_strict) {
                printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
-               if (acpi_strict)
-                       return_VALUE(AE_BAD_PARAMETER);
+               return_VALUE(AE_BAD_PARAMETER);
        }
 
        ec = (struct acpi_ec *) handler_context;
@@ -620,11 +619,11 @@ acpi_ec_space_handler (
 next_byte:
        switch (function) {
        case ACPI_READ:
-               result = acpi_ec_read(ec, (u8) address, &temp);
-               *value = (acpi_integer) temp;
+               temp = 0;
+               result = acpi_ec_read(ec, (u8) address, (u32 *)&temp);
                break;
        case ACPI_WRITE:
-               result = acpi_ec_write(ec, (u8) address, (u8) *value);
+               result = acpi_ec_write(ec, (u8) address, (u8) temp);
                break;
        default:
                result = -EINVAL;
@@ -633,19 +632,18 @@ next_byte:
        }
 
        bit_width -= 8;
-       if(bit_width){
-
-               if(function == ACPI_READ)
-                       f_v |= (acpi_integer) (*value) << 8*i;
-               if(function == ACPI_WRITE)
-                       (*value) >>=8; 
+       if (bit_width) {
+               if (function == ACPI_READ)
+                       f_v |= temp << 8 * i;
+               if (function == ACPI_WRITE)
+                       temp >>= 8;
                i++;
+               (u8)address ++;
                goto next_byte;
        }
 
-
-       if(function == ACPI_READ){
-               f_v |= (acpi_integer) (*value) << 8*i;
+       if (function == ACPI_READ) {
+               f_v |= temp << 8 * i;
                *value = f_v;
        }
 
@@ -664,8 +662,6 @@ out:
        default:
                return_VALUE(AE_OK);
        }
-       
-
 }