From: "xinhui.pan" <[email protected]> some devices go crasy, we can't resume it even after reset. This case will cause timeout again and again. What is worse, if there is a watchdog, panic will be generated as timer expires. To prevent this, we just return -ENODEV immediately. Later it will be re-enumerated.
Signed-off-by: xinhui.pan <[email protected]> --- drivers/usb/core/hub.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 64ea219..c5d0d8d 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -4141,7 +4141,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, r = -EPROTO; break; } - if (r == 0) + if (r == 0 || r == -ETIMEDOUT) break; } udev->descriptor.bMaxPacketSize0 = @@ -4161,6 +4161,10 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, if (r != -ENODEV) dev_err(&udev->dev, "device descriptor read/64, error %d\n", r); + if (r == -ETIMEDOUT) { + retval = -ENODEV; + goto fail; + } retval = -EMSGSIZE; continue; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
