accroding to bd0e6c9#diff-28615d62e1250eadc353d804f49bc6d6, will try old enumeration scheme first for high speed devices. for example, when a high speed device pluged in, line 2720 should expand to 0 at the first time. USE_NEW_SCHEME(0, 0 || 0 || 1) === 0. but it wrongly expand to 1(alway expand to 1 for high speed device), and change USE_NEW_SCHEME to USE_NEW_SCHEME((i) % 2 == (int)(scheme)) may be better ? Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Qi Zhou <atmgnd@xxxxxxxxxxxxxx> --- drivers/usb/core/hub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f229ad6952c0..7d17deca7021 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2692,7 +2692,7 @@ static unsigned hub_is_wusb(struct usb_hub *hub) #define SET_ADDRESS_TRIES 2 #define GET_DESCRIPTOR_TRIES 2 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) -#define USE_NEW_SCHEME(i, scheme) ((i) / 2 == (int)scheme) +#define USE_NEW_SCHEME(i, scheme) ((i) / 2 == (int)(scheme)) #define HUB_ROOT_RESET_TIME 60 /* times are in msec */ #define HUB_SHORT_RESET_TIME 10 -- 2.17.1
