From 56626a72a47bf3e50875d960d6b5f17b9bee0ab2 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Thu, 14 Oct 2010 15:25:21 -0400 Subject: [PATCH] USB: accept some invalid ep0-maxpacket values A few devices (such as the RCA VR5220 voice recorder) are so non-compliant with the USB spec that they have invalid maxpacket sizes for endpoint 0. Nevertheless, as long as we can safely use them, we may as well do so. This patch (as1432) softens our acceptance criterion by allowing high-speed devices to have ep0-maxpacket sizes other than 64. A warning is printed in the system log when this happens, and the existing error message is clarified. Signed-off-by: Alan Stern Reported-by: James Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 7f82c48a0bae..27115b45edc5 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2861,13 +2861,16 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, else i = udev->descriptor.bMaxPacketSize0; if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { - if (udev->speed != USB_SPEED_FULL || + if (udev->speed == USB_SPEED_LOW || !(i == 8 || i == 16 || i == 32 || i == 64)) { - dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); + dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); retval = -EMSGSIZE; goto fail; } - dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); + if (udev->speed == USB_SPEED_FULL) + dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); + else + dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); usb_ep0_reinit(udev); } -- 2.20.1