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authorAlan Stern <stern@rowland.harvard.edu>2007-08-22 13:08:40 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 14:55:19 -0700
commit6e8fe43b26085a64327d1cbb751ab895f3ad3f5d (patch)
treecfc80d392d933788b13ca1fdf45afc8cfb9682c3 /drivers/usb/host/ohci-q.c
parent1f5a3d0f34fd5719081c6b8f3dbbcbe328d4da31 (diff)
downloadlinux-6e8fe43b26085a64327d1cbb751ab895f3ad3f5d.tar.bz2
USB: avoid the donelist after an error in ohci-hcd
This patch (as972) changes ohci-hcd so that after an error occurs, the remaining TDs for the URB will be skipped over entirely instead of going through the donelist. This enables the driver to give back the URB as soon as the error is detected, avoiding the need to store the error status in urb->status. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ohci-q.c')
-rw-r--r--drivers/usb/host/ohci-q.c24
1 files changed, 8 insertions, 16 deletions
diff --git a/drivers/usb/host/ohci-q.c b/drivers/usb/host/ohci-q.c
index 3c793fad178d..860e55ff67a1 100644
--- a/drivers/usb/host/ohci-q.c
+++ b/drivers/usb/host/ohci-q.c
@@ -783,10 +783,10 @@ static void td_done (struct ohci_hcd *ohci, struct urb *urb, struct td *td)
/*-------------------------------------------------------------------------*/
-static inline struct td *
-ed_halted (struct ohci_hcd *ohci, struct td *td, int cc, struct td *rev)
+static void ed_halted(struct ohci_hcd *ohci, struct td *td, int cc)
{
struct urb *urb = td->urb;
+ urb_priv_t *urb_priv = urb->hcpriv;
struct ed *ed = td->ed;
struct list_head *tmp = td->td_list.next;
__hc32 toggle = ed->hwHeadP & cpu_to_hc32 (ohci, ED_C);
@@ -798,13 +798,12 @@ ed_halted (struct ohci_hcd *ohci, struct td *td, int cc, struct td *rev)
wmb ();
ed->hwHeadP &= ~cpu_to_hc32 (ohci, ED_H);
- /* put any later tds from this urb onto the donelist, after 'td',
- * order won't matter here: no errors, and nothing was transferred.
- * also patch the ed so it looks as if those tds completed normally.
+ /* Get rid of all later tds from this urb. We don't have
+ * to be careful: no errors and nothing was transferred.
+ * Also patch the ed so it looks as if those tds completed normally.
*/
while (tmp != &ed->td_list) {
struct td *next;
- __hc32 info;
next = list_entry (tmp, struct td, td_list);
tmp = next->td_list.next;
@@ -819,14 +818,9 @@ ed_halted (struct ohci_hcd *ohci, struct td *td, int cc, struct td *rev)
* then we need to leave the control STATUS packet queued
* and clear ED_SKIP.
*/
- info = next->hwINFO;
- info |= cpu_to_hc32 (ohci, TD_DONE);
- info &= ~cpu_to_hc32 (ohci, TD_CC);
- next->hwINFO = info;
-
- next->next_dl_td = rev;
- rev = next;
+ list_del(&next->td_list);
+ urb_priv->td_cnt++;
ed->hwHeadP = next->hwNextTD | toggle;
}
@@ -852,8 +846,6 @@ ed_halted (struct ohci_hcd *ohci, struct td *td, int cc, struct td *rev)
hc32_to_cpu (ohci, td->hwINFO),
cc, cc_to_error [cc]);
}
-
- return rev;
}
/* replies to the request have to be on a FIFO basis so
@@ -890,7 +882,7 @@ static struct td *dl_reverse_done_list (struct ohci_hcd *ohci)
*/
if (cc != TD_CC_NOERROR
&& (td->ed->hwHeadP & cpu_to_hc32 (ohci, ED_H)))
- td_rev = ed_halted (ohci, td, cc, td_rev);
+ ed_halted(ohci, td, cc);
td->next_dl_td = td_rev;
td_rev = td;