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path: root/drivers/firmware/edd.c
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Diffstat (limited to 'drivers/firmware/edd.c')
-rw-r--r--drivers/firmware/edd.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/firmware/edd.c b/drivers/firmware/edd.c
index 96c25d93eed1..f1b7f659d3c9 100644
--- a/drivers/firmware/edd.c
+++ b/drivers/firmware/edd.c
@@ -531,8 +531,8 @@ static int
edd_has_edd30(struct edd_device *edev)
{
struct edd_info *info;
- int i, nonzero_path = 0;
- char c;
+ int i;
+ u8 csum = 0;
if (!edev)
return 0;
@@ -544,16 +544,16 @@ edd_has_edd30(struct edd_device *edev)
return 0;
}
- for (i = 30; i <= 73; i++) {
- c = *(((uint8_t *) info) + i + 4);
- if (c) {
- nonzero_path++;
- break;
- }
- }
- if (!nonzero_path) {
+
+ /* We support only T13 spec */
+ if (info->params.device_path_info_length != 44)
+ return 0;
+
+ for (i = 30; i < info->params.device_path_info_length + 30; i++)
+ csum += *(((u8 *)&info->params) + i);
+
+ if (csum)
return 0;
- }
return 1;
}