When a SuperSpeed device is plugged into a high speed hub or
an EHCI port, it will show up as a high speed device with a BCD of
0x0210 and it will contain a SuperSpeed Capabilities BOS descriptor. If
we see such a high speed device, warn the user that they should plug
their device into a USB 3.0 hub or xHCI root port.
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
---
Ok, this version actually compiles and doesn't cause kernel oopses.
I'll queue this up to my for-usb-next branch for 3.4 if no one objects.
drivers/usb/core/hub.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 79d339e..15da2d5 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3142,6 +3142,16 @@ check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
kfree(qual);
}
+static void check_superspeed(struct usb_hub *hub, struct usb_device *udev,
+ int port1)
+{
+ /* BOS descriptor should have already been fetched by now. */
+ if (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300 &&
+ udev->bos && udev->bos->ss_cap)
+ dev_info(&udev->dev, "not running at top speed; "
+ "connect to a SuperSpeed hub or host\n");
+}
+
static unsigned
hub_power_remaining (struct usb_hub *hub)
{
@@ -3361,6 +3371,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
&& udev->speed == USB_SPEED_FULL
&& highspeed_hubs != 0)
check_highspeed (hub, udev, port1);
+ check_superspeed(hub, udev, port1);
/* Store the parent's children[] pointer. At this point
* udev becomes globally accessible, although presumably
--
1.7.5.4
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