Showing error 771

User: Jiri Slaby
Error type: Invalid Pointer Dereference
Error type description: A pointer which is invalid is being dereferenced
File location: drivers/usb/host/ehci-sched.c
Line in file: 865
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Entered: 2011-11-07 22:22:22 UTC

Source: 

 835
 836        /* then queue the urb's tds to the qh */
 837        qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv);
 838        BUG_ON (qh == NULL);
 839
 840        /* ... update usbfs periodic stats */
 841        ehci_to_hcd(ehci)->self.bandwidth_int_reqs++;
 842
 843done:
 844        if (unlikely(status))
 845                usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
 846done_not_linked:
 847        spin_unlock_irqrestore (&ehci->lock, flags);
 848        if (status)
 849                qtd_list_free (ehci, urb, qtd_list);
 850
 851        return status;
 852}
 853
 854/*-------------------------------------------------------------------------*/
 855
 856/* ehci_iso_stream ops work with both ITD and SITD */
 857
 858static struct ehci_iso_stream *
 859iso_stream_alloc (gfp_t mem_flags)
 860{
 861        struct ehci_iso_stream *stream;
 862
 863        stream = kzalloc(sizeof *stream, mem_flags);
 864        if (likely (stream != NULL)) {
 865                INIT_LIST_HEAD(&stream->td_list);
 866                INIT_LIST_HEAD(&stream->free_list);
 867                stream->next_uframe = -1;
 868                stream->refcount = 1;
 869        }
 870        return stream;
 871}
 872
 873static void
 874iso_stream_init (
 875        struct ehci_hcd                *ehci,
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