diff options
Diffstat (limited to 'usb/usb-accept-some-invalid-ep0-maxpacket-values.patch')
| -rw-r--r-- | usb/usb-accept-some-invalid-ep0-maxpacket-values.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/usb/usb-accept-some-invalid-ep0-maxpacket-values.patch b/usb/usb-accept-some-invalid-ep0-maxpacket-values.patch new file mode 100644 index 00000000000000..ad49fc51601b55 --- /dev/null +++ b/usb/usb-accept-some-invalid-ep0-maxpacket-values.patch @@ -0,0 +1,49 @@ +From stern+4cbd0eee@rowland.harvard.edu Thu Oct 14 12:35:30 2010 +Date: Thu, 14 Oct 2010 15:25:21 -0400 (EDT) +From: Alan Stern <stern@rowland.harvard.edu> +To: Greg KH <greg@kroah.com> +cc: James <bjlockie@lockie.ca> +Subject: USB: accept some invalid ep0-maxpacket values +Message-ID: <Pine.LNX.4.44L0.1010141521440.1645-100000@iolanthe.rowland.org> + +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 <stern@rowland.harvard.edu> +Reported-by: James <bjlockie@lockie.ca> +Cc: stable <stable@kernel.org> +Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> + +--- + drivers/usb/core/hub.c | 9 ++++++--- + 1 file changed, 6 insertions(+), 3 deletions(-) + +--- a/drivers/usb/core/hub.c ++++ b/drivers/usb/core/hub.c +@@ -2861,13 +2861,16 @@ hub_port_init (struct usb_hub *hub, stru + 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); + } |