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UHCI: Fix problem caused by lack of terminating QH

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This patch (as871) fixes a problem introduced by an earlier change.
It turns out that some systems really do need to have a terminating
skeleton QH present whenever FSBR is on.  I don't know any way to tell
which systems do need it and which don't; the easiest answer is to
have it there always.

This fixes the NumLock-hang bug reported by Jiri Slaby.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2007-03-19 15:31:42 -04:00
committed by Greg Kroah-Hartman
parent e0f2e3a06b
commit e009f1b202
3 changed files with 41 additions and 82 deletions
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26
drivers/usb/host/uhci-debug.c
View File

@@ -145,7 +145,8 @@ static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space)
return out - buf;
}
static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space)
static int uhci_show_qh(struct uhci_hcd *uhci,
struct uhci_qh *qh, char *buf, int len, int space)
{
char *out = buf;
int i, nurbs;
@@ -190,6 +191,9 @@ static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space)
if (list_empty(&qh->queue)) {
out += sprintf(out, "%*s queue is empty\n", space, "");
if (qh == uhci->skel_async_qh)
out += uhci_show_td(uhci->term_td, out,
len - (out - buf), 0);
} else {
struct urb_priv *urbp = list_entry(qh->queue.next,
struct urb_priv, node);
@@ -343,6 +347,7 @@ static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
struct list_head *tmp, *head;
int nframes, nerrs;
__le32 link;
__le32 fsbr_link;
static const char * const qh_names[] = {
"unlink", "iso", "int128", "int64", "int32", "int16",
@@ -424,21 +429,22 @@ check_link:
out += sprintf(out, "Skeleton QHs\n");
fsbr_link = 0;
for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
int cnt = 0;
__le32 fsbr_link = 0;
qh = uhci->skelqh[i];
out += sprintf(out, "- skel_%s_qh\n", qh_names[i]); \
out += uhci_show_qh(qh, out, len - (out - buf), 4);
out += uhci_show_qh(uhci, qh, out, len - (out - buf), 4);
/* Last QH is the Terminating QH, it's different */
if (i == SKEL_TERM) {
if (qh_element(qh) != LINK_TO_TD(uhci->term_td))
out += sprintf(out, " skel_term_qh element is not set to term_td!\n");
if (link == LINK_TO_QH(uhci->skel_term_qh))
goto check_qh_link;
continue;
link = fsbr_link;
if (!link)
link = LINK_TO_QH(uhci->skel_term_qh);
goto check_qh_link;
}
head = &qh->node;
@@ -448,7 +454,7 @@ check_link:
qh = list_entry(tmp, struct uhci_qh, node);
tmp = tmp->next;
if (++cnt <= 10)
out += uhci_show_qh(qh, out,
out += uhci_show_qh(uhci, qh, out,
len - (out - buf), 4);
if (!fsbr_link && qh->skel >= SKEL_FSBR)
fsbr_link = LINK_TO_QH(qh);
@@ -463,8 +469,6 @@ check_link:
link = LINK_TO_QH(uhci->skel_async_qh);
else if (!uhci->fsbr_is_on)
;
else if (fsbr_link)
link = fsbr_link;
else
link = LINK_TO_QH(uhci->skel_term_qh);
check_qh_link:
@@ -573,8 +577,8 @@ static const struct file_operations uhci_debug_operations = {
static inline void lprintk(char *buf)
{}
static inline int uhci_show_qh(struct uhci_qh *qh, char *buf,
int len, int space)
static inline int uhci_show_qh(struct uhci_hcd *uhci,
struct uhci_qh *qh, char *buf, int len, int space)
{
return 0;
}