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-rw-r--r--include/uapi/linux/usb/ch9.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h
index c4c79aa331bd..d5a5caec8fbc 100644
--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -1077,9 +1077,9 @@ struct usb_ptm_cap_descriptor {
#define USB_DT_USB_PTM_ID_SIZE 3
/*
* The size of the descriptor for the Sublink Speed Attribute Count
- * (SSAC) specified in bmAttributes[4:0].
+ * (SSAC) specified in bmAttributes[4:0]. SSAC is zero-based
*/
-#define USB_DT_USB_SSP_CAP_SIZE(ssac) (16 + ssac * 4)
+#define USB_DT_USB_SSP_CAP_SIZE(ssac) (12 + (ssac + 1) * 4)
/*-------------------------------------------------------------------------*/
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