musb_host: simplify check for active URB
The existance of the scheduling list shouldn't matter in
determining whether there's currectly an URB executing on a
hardware endpoint. What should actually matter is the 'in_qh'
or 'out_qh' fields of the 'struct musb_hw_ep' -- those are
set in musb_start_urb() and cleared in musb_giveback() when
the endpoint's URB list drains. Hence we should be able to
replace the big *switch* statements in musb_urb_dequeue()
and musb_h_disable() with mere musb_ep_get_qh() calls...
While at it, do some more changes:
- add 'is_in' variable to musb_urb_dequeue();
- remove the unnecessary 'epnum' variable from musb_h_disable();
- fix the comment style in the vicinity.
This is a minor shrink of source and object code.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 17d14f2..e0dacbb 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -2089,14 +2089,14 @@
{
struct musb *musb = hcd_to_musb(hcd);
struct musb_qh *qh;
- struct list_head *sched;
unsigned long flags;
+ int is_in = usb_pipein(urb->pipe);
int ret;
DBG(4, "urb=%p, dev%d ep%d%s\n", urb,
usb_pipedevice(urb->pipe),
usb_pipeendpoint(urb->pipe),
- usb_pipein(urb->pipe) ? "in" : "out");
+ is_in ? "in" : "out");
spin_lock_irqsave(&musb->lock, flags);
ret = usb_hcd_check_unlink_urb(hcd, urb, status);
@@ -2107,45 +2107,23 @@
if (!qh)
goto done;
- /* Any URB not actively programmed into endpoint hardware can be
+ /*
+ * Any URB not actively programmed into endpoint hardware can be
* immediately given back; that's any URB not at the head of an
* endpoint queue, unless someday we get real DMA queues. And even
* if it's at the head, it might not be known to the hardware...
*
- * Otherwise abort current transfer, pending dma, etc.; urb->status
+ * Otherwise abort current transfer, pending DMA, etc.; urb->status
* has already been updated. This is a synchronous abort; it'd be
* OK to hold off until after some IRQ, though.
+ *
+ * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
*/
- if (!qh->is_ready || urb->urb_list.prev != &qh->hep->urb_list)
- ret = -EINPROGRESS;
- else {
- switch (qh->type) {
- case USB_ENDPOINT_XFER_CONTROL:
- sched = &musb->control;
- break;
- case USB_ENDPOINT_XFER_BULK:
- if (qh->mux == 1) {
- if (usb_pipein(urb->pipe))
- sched = &musb->in_bulk;
- else
- sched = &musb->out_bulk;
- break;
- }
- default:
- /* REVISIT when we get a schedule tree, periodic
- * transfers won't always be at the head of a
- * singleton queue...
- */
- sched = NULL;
- break;
- }
- }
-
- /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
- if (ret < 0 || (sched && qh != first_qh(sched))) {
+ if (!qh->is_ready
+ || urb->urb_list.prev != &qh->hep->urb_list
+ || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
int ready = qh->is_ready;
- ret = 0;
qh->is_ready = 0;
__musb_giveback(musb, urb, 0);
qh->is_ready = ready;
@@ -2169,13 +2147,11 @@
static void
musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
{
- u8 epnum = hep->desc.bEndpointAddress;
+ u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
unsigned long flags;
struct musb *musb = hcd_to_musb(hcd);
- u8 is_in = epnum & USB_DIR_IN;
struct musb_qh *qh;
struct urb *urb;
- struct list_head *sched;
spin_lock_irqsave(&musb->lock, flags);
@@ -2183,31 +2159,11 @@
if (qh == NULL)
goto exit;
- switch (qh->type) {
- case USB_ENDPOINT_XFER_CONTROL:
- sched = &musb->control;
- break;
- case USB_ENDPOINT_XFER_BULK:
- if (qh->mux == 1) {
- if (is_in)
- sched = &musb->in_bulk;
- else
- sched = &musb->out_bulk;
- break;
- }
- default:
- /* REVISIT when we get a schedule tree, periodic transfers
- * won't always be at the head of a singleton queue...
- */
- sched = NULL;
- break;
- }
+ /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
- /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
-
- /* kick first urb off the hardware, if needed */
+ /* Kick the first URB off the hardware, if needed */
qh->is_ready = 0;
- if (!sched || qh == first_qh(sched)) {
+ if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
urb = next_urb(qh);
/* make software (then hardware) stop ASAP */