diff options
| -rw-r--r-- | drivers/usb/host/xhci.c | 3 | ||||
| -rw-r--r-- | include/linux/usb/ch9.h | 20 |
2 files changed, 20 insertions, 3 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 004bcab17785..5fc595f01b31 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -2183,8 +2183,7 @@ static int xhci_calculate_streams_and_bitmask(struct xhci_hcd *xhci, if (ret < 0) return ret; - max_streams = USB_SS_MAX_STREAMS( - eps[i]->ss_ep_comp.bmAttributes); + max_streams = usb_ss_max_streams(&eps[i]->ss_ep_comp); if (max_streams < (*num_streams - 1)) { xhci_dbg(xhci, "Ep 0x%x only supports %u stream IDs.\n", eps[i]->desc.bEndpointAddress, diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h index 0fd3fbdd8283..cf65b5cff722 100644 --- a/include/linux/usb/ch9.h +++ b/include/linux/usb/ch9.h @@ -583,8 +583,26 @@ struct usb_ss_ep_comp_descriptor { } __attribute__ ((packed)); #define USB_DT_SS_EP_COMP_SIZE 6 + /* Bits 4:0 of bmAttributes if this is a bulk endpoint */ -#define USB_SS_MAX_STREAMS(p) (1 << ((p) & 0x1f)) +static inline int +usb_ss_max_streams(const struct usb_ss_ep_comp_descriptor *comp) +{ + int max_streams; + + if (!comp) + return 0; + + max_streams = comp->bmAttributes & 0x1f; + + if (!max_streams) + return 0; + + max_streams = 1 << max_streams; + + return max_streams; +} + /* Bits 1:0 of bmAttributes if this is an isoc endpoint */ #define USB_SS_MULT(p) (1 + ((p) & 0x3)) |