diff options
| -rw-r--r-- | drivers/usb/mon/mon_bin.c | 34 |
1 files changed, 31 insertions, 3 deletions
diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c index 44cb37b5a4dc..a4cae2ea5cbf 100644 --- a/drivers/usb/mon/mon_bin.c +++ b/drivers/usb/mon/mon_bin.c @@ -437,6 +437,28 @@ static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp, return length; } +/* + * This is the look-ahead pass in case of 'C Zi', when actual_length cannot + * be used to determine the length of the whole contiguous buffer. + */ +static unsigned int mon_bin_collate_isodesc(const struct mon_reader_bin *rp, + struct urb *urb, unsigned int ndesc) +{ + struct usb_iso_packet_descriptor *fp; + unsigned int length; + + length = 0; + fp = urb->iso_frame_desc; + while (ndesc-- != 0) { + if (fp->actual_length != 0) { + if (fp->offset + fp->actual_length > length) + length = fp->offset + fp->actual_length; + } + fp++; + } + return length; +} + static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) { @@ -479,6 +501,10 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, /* * Find the maximum allowable length, then allocate space. */ + urb_length = (ev_type == 'S') ? + urb->transfer_buffer_length : urb->actual_length; + length = urb_length; + if (usb_endpoint_xfer_isoc(epd)) { if (urb->number_of_packets < 0) { ndesc = 0; @@ -487,14 +513,16 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, } else { ndesc = urb->number_of_packets; } + if (ev_type == 'C' && usb_urb_dir_in(urb)) + length = mon_bin_collate_isodesc(rp, urb, ndesc); } else { ndesc = 0; } lendesc = ndesc*sizeof(struct mon_bin_isodesc); - urb_length = (ev_type == 'S') ? - urb->transfer_buffer_length : urb->actual_length; - length = urb_length; + /* not an issue unless there's a subtle bug in a HCD somewhere */ + if (length >= urb->transfer_buffer_length) + length = urb->transfer_buffer_length; if (length >= rp->b_size/5) length = rp->b_size/5; |