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-rw-r--r--contrib/libusb-Fix-Zero-Length-Packet-issue.patch71
1 files changed, 71 insertions, 0 deletions
diff --git a/contrib/libusb-Fix-Zero-Length-Packet-issue.patch b/contrib/libusb-Fix-Zero-Length-Packet-issue.patch
new file mode 100644
index 0000000..40fc2dc
--- /dev/null
+++ b/contrib/libusb-Fix-Zero-Length-Packet-issue.patch
@@ -0,0 +1,71 @@
+>From e6a34fe2fcd69d05411d3a8d41c8e897c9c337e1 Mon Sep 17 00:00:00 2001
+From: Nikias Bassen <nikias@gmx.li>
+Date: Mon, 17 Aug 2009 00:48:17 +0200
+Subject: [PATCH] Fix Zero Length Packet issue, new LIBUSB_TRANSFER_ZERO_PACKET flag.
+
+This patch fixes the Zero Length Packet issue by allowing the client
+program to specify the LIBUSB_TRANSFER_ZERO_PACKET flag when calling
+libusb_submit_transfer. This will pass the URB_ZERO_PACKET flag to the
+appropriate ioctl and thus triggers zero-length packet processing
+inside the kernel. This patch will also pass the URB_SHORT_NOT_OK flag
+if LIBUSB_TRANSFER_SHORT_NOT_OK is specified.
+---
+ libusb/libusb.h | 5 ++++-
+ libusb/os/linux_usbfs.c | 5 +++++
+ libusb/os/linux_usbfs.h | 8 +++++---
+ 3 files changed, 14 insertions(+), 4 deletions(-)
+
+diff --git a/libusb/libusb.h b/libusb/libusb.h
+index 1126380..1dc7ae0 100644
+--- a/libusb/libusb.h
++++ b/libusb/libusb.h
+@@ -672,7 +672,10 @@ enum libusb_transfer_flags {
+ * If this flag is set, it is illegal to call libusb_free_transfer()
+ * from your transfer callback, as this will result in a double-free
+ * when this flag is acted upon. */
+- LIBUSB_TRANSFER_FREE_TRANSFER = 1<<2
++ LIBUSB_TRANSFER_FREE_TRANSFER = 1<<2,
++
++ /** zero-terminate a packet that is N*wMaxPacketSize bytes long */
++ LIBUSB_TRANSFER_ZERO_PACKET = 1<<3
+ };
+
+ /** \ingroup asyncio
+diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c
+index 1280188..81a9498 100644
+--- a/libusb/os/linux_usbfs.c
++++ b/libusb/os/linux_usbfs.c
+@@ -1307,6 +1307,11 @@ static int submit_bulk_transfer(struct usbi_transfer *itransfer,
+ else
+ urb->buffer_length = MAX_BULK_BUFFER_LENGTH;
+
++ if (transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK)
++ urb->flags |= USBFS_URB_SHORT_NOT_OK;
++ if (transfer->flags & LIBUSB_TRANSFER_ZERO_PACKET)
++ urb->flags |= USBFS_URB_ZERO_PACKET;
++
+ r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb);
+ if (r < 0) {
+ int j;
+diff --git a/libusb/os/linux_usbfs.h b/libusb/os/linux_usbfs.h
+index fdf5e9b..4660e3b 100644
+--- a/libusb/os/linux_usbfs.h
++++ b/libusb/os/linux_usbfs.h
+@@ -60,9 +60,11 @@ struct usbfs_getdriver {
+ char driver[USBFS_MAXDRIVERNAME + 1];
+ };
+
+-#define USBFS_URB_DISABLE_SPD 1
+-#define USBFS_URB_ISO_ASAP 2
+-#define USBFS_URB_QUEUE_BULK 0x10
++#define USBFS_URB_SHORT_NOT_OK 0x01
++#define USBFS_URB_ISO_ASAP 0x02
++#define USBFS_URB_NO_FSBR 0x20
++#define USBFS_URB_ZERO_PACKET 0x40
++#define USBFS_URB_NO_INTERRUPT 0x80
+
+ enum usbfs_urb_type {
+ USBFS_URB_TYPE_ISO = 0,
+--
+1.6.0.4
+