[PATCH] USB: sl811-hcd minor fixes

Three minor sl811-hcd fixes:

 - Elminate memory leak on one (rare) disable/shutdown path.

 - For periodic transfers that don't need to be scheduled, update
   urb->start_frame to represent the transfer phase correctly.

 - Report the (single) port as removable, by default.

Since no drivers yet use start_frame or that part of the hub descriptor,
only that leak is likely to ever matter.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 drivers/usb/host/sl811-hcd.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index d2a1fd40dfcb846e148faef3e9102142c2ba7cc6..d42a15d10a462de96a4ba16869990f4ae41f1057 100644 (file)
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -782,6 +782,9 @@ retry:
 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
  * this driver doesn't promise that much since it's got to handle an
  * IRQ per packet; irq handling latencies also use up that time.
+ *
+ * NOTE:  the periodic schedule is a sparse tree, with the load for
+ * each branch minimized.  see fig 3.5 in the OHCI spec for example.
  */
 #define        MAX_PERIODIC_LOAD       500     /* out of 1000 usec */
 
@@ -843,6 +846,7 @@ static int sl811h_urb_enqueue(
        if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
                        || !HC_IS_RUNNING(hcd->state)) {
                retval = -ENODEV;
+               kfree(ep);
                goto fail;
        }
 
@@ -911,8 +915,16 @@ static int sl811h_urb_enqueue(
        case PIPE_ISOCHRONOUS:
        case PIPE_INTERRUPT:
                urb->interval = ep->period;
-               if (ep->branch < PERIODIC_SIZE)
+               if (ep->branch < PERIODIC_SIZE) {
+                       /* NOTE:  the phase is correct here, but the value
+                        * needs offsetting by the transfer queue depth.
+                        * All current drivers ignore start_frame, so this
+                        * is unlikely to ever matter...
+                        */
+                       urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
+                                               + ep->branch;
                        break;
+               }
 
                retval = balance(sl811, ep->period, ep->load);
                if (retval < 0)
@@ -1122,7 +1134,7 @@ sl811h_hub_descriptor (
        desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
 
        /* two bitmaps:  ports removable, and legacy PortPwrCtrlMask */
-       desc->bitmap[0] = 1 << 1;
+       desc->bitmap[0] = 0 << 1;
        desc->bitmap[1] = ~0;
 }