1 files changed, 43 insertions, 5 deletions

diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index e345f15b7d87..b40bc1ac9b8c 100644
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -347,6 +347,7 @@ static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
         struct uhci_qh *qh;
         struct uhci_td *td;
         struct list_head *tmp, *head;
+        int nframes, nerrs;
 
         out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
         out += sprintf(out, "HC status\n");
@@ -355,23 +356,60 @@ static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
                 return out - buf;
 
         out += sprintf(out, "Frame List\n");
+        nframes = 10;
+        nerrs = 0;
         for (i = 0; i < UHCI_NUMFRAMES; ++i) {
+                __le32 link, qh_dma;
+
+                j = 0;
                 td = uhci->frame_cpu[i];
+                link = uhci->frame[i];
                 if (!td)
-                        continue;
+                        goto check_link;
 
-                out += sprintf(out, "- Frame %d\n", i); \
-                if (td->dma_handle != (dma_addr_t)uhci->frame[i])
-                        out += sprintf(out, "    frame list does not match td->dma_handle!\n");
+                if (nframes > 0) {
+                        out += sprintf(out, "- Frame %d -> (%08x)\n",
+                                        i, le32_to_cpu(link));
+                        j = 1;
+                }
 
                 head = &td->fl_list;
                 tmp = head;
                 do {
                         td = list_entry(tmp, struct uhci_td, fl_list);
                         tmp = tmp->next;
-                        out += uhci_show_td(td, out, len - (out - buf), 4);
+                        if (cpu_to_le32(td->dma_handle) != link) {
+                                if (nframes > 0)
+                                        out += sprintf(out, "    link does "
+                                                "not match list entry!\n");
+                                else
+                                        ++nerrs;
+                        }
+                        if (nframes > 0)
+                                out += uhci_show_td(td, out,
+                                                len - (out - buf), 4);
+                        link = td->link;
                 } while (tmp != head);
+
+check_link:
+                qh_dma = uhci_frame_skel_link(uhci, i);
+                if (link != qh_dma) {
+                        if (nframes > 0) {
+                                if (!j) {
+                                        out += sprintf(out,
+                                                "- Frame %d -> (%08x)\n",
+                                                i, le32_to_cpu(link));
+                                        j = 1;
+                                }
+                                out += sprintf(out, "   link does not match "
+                                        "QH (%08x)!\n", le32_to_cpu(qh_dma));
+                        } else
+                                ++nerrs;
+                }
+                nframes -= j;
         }
+        if (nerrs > 0)
+                out += sprintf(out, "Skipped %d bad links\n", nerrs);
 
         out += sprintf(out, "Skeleton QHs\n");