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The USBFS_URB_SHORT_NOT_OK flag is valid for IN urbs only. When USB
debugging is enabled in the linux kernel its usb_submit_urb() function
will validate and reject OUT urbs where this flag is set.
E.g. you will see something like
usb 1-1.4: BOGUS urb flags, 1 --> 0
when sending bulk urbs.
This patch sets USBFS_URB_SHORT_NOT_OK only for IN urbs.
Index: libusb-1.0.6/libusb/os/linux_usbfs.c
===================================================================
--- libusb-1.0.6.orig/libusb/os/linux_usbfs.c
+++ libusb-1.0.6/libusb/os/linux_usbfs.c
@@ -1360,11 +1360,13 @@ static int submit_bulk_transfer(struct u
for (i = 0; i < num_urbs; i++) {
struct usbfs_urb *urb = &urbs[i];
+ int is_out = ((transfer->endpoint & LIBUSB_ENDPOINT_DIR_MASK)
+ == LIBUSB_ENDPOINT_OUT);
urb->usercontext = itransfer;
urb->type = urb_type;
urb->endpoint = transfer->endpoint;
urb->buffer = transfer->buffer + (i * MAX_BULK_BUFFER_LENGTH);
- if (supports_flag_bulk_continuation)
+ if (supports_flag_bulk_continuation && !is_out)
urb->flags = USBFS_URB_SHORT_NOT_OK;
if (i == num_urbs - 1 && last_urb_partial)
urb->buffer_length = transfer->length % MAX_BULK_BUFFER_LENGTH;
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