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| author | Daniel Drake <dsd@gentoo.org> | 2009-06-20 22:33:21 +0100 |
|---|---|---|
| committer | Daniel Drake <dsd@gentoo.org> | 2009-06-20 22:33:21 +0100 |
| commit | 615f18e64e96ae4ecc8e43d0de00933059a5209a (patch) | |
| tree | 1c8e5bcc86b5eaf8f99bfdf3c7e2aaf59f2ef2e0 | |
| parent | 86f79fbf61c2018bdf009c7ebf92b38f3a16fd0c (diff) | |
| download | libusb-615f18e64e96ae4ecc8e43d0de00933059a5209a.tar.gz | |
Linux: fix sending of zero length bulk packets
Note that there are is a kernel bug preventing this from working
properly at the moment, even after this fix.
| -rw-r--r-- | libusb/os/linux_usbfs.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c index 08de28c..f9899cf 100644 --- a/libusb/os/linux_usbfs.c +++ b/libusb/os/linux_usbfs.c @@ -1276,7 +1276,9 @@ static int submit_bulk_transfer(struct usbi_transfer *itransfer, int num_urbs = transfer->length / MAX_BULK_BUFFER_LENGTH; int last_urb_partial = 0; - if ((transfer->length % MAX_BULK_BUFFER_LENGTH) > 0) { + if (transfer->length == 0) { + num_urbs = 1; + } else if ((transfer->length % MAX_BULK_BUFFER_LENGTH) > 0) { last_urb_partial = 1; num_urbs++; } @@ -1300,6 +1302,8 @@ static int submit_bulk_transfer(struct usbi_transfer *itransfer, urb->buffer = transfer->buffer + (i * MAX_BULK_BUFFER_LENGTH); if (i == num_urbs - 1 && last_urb_partial) urb->buffer_length = transfer->length % MAX_BULK_BUFFER_LENGTH; + else if (transfer->length == 0) + urb->buffer_length = 0; else urb->buffer_length = MAX_BULK_BUFFER_LENGTH; |