Hello Rupesh,
The patch ae926051d7eb: "staging: ozwpan: Added USB HCD
implementation" from Feb 20, 2012, leads to the following warning:
drivers/staging/ozwpan/ozhcd.c:1094 oz_hcd_heartbeat()
warn: what is this condition about? 'ep->buffered_units * 50'
drivers/staging/ozwpan/ozhcd.c
1088 /* Check the IN isoc endpoints to see if any URBs can be completed.
1089 */
1090 spin_lock_bh(&ozhcd->hcd_lock);
1091 list_for_each(e, &port->isoc_in_ep) {
1092 struct oz_endpoint *ep = ep_from_link(e);
1093 if (ep->flags & OZ_F_EP_BUFFERING) {
1094 if (ep->buffered_units * OZ_IN_BUFFERING_UNITS) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
It's not clear what we are testing for here. It would be false if
->buffered_units was zero or if the multiplication overflowed. If it's
testing for integer overflows, there are better ways to write that.
It looks buggy to me, but I don't know what the intention was.
1095 ep->flags &= ~OZ_F_EP_BUFFERING;
1096 ep->credit = 0;
1097 oz_event_log(OZ_EVT_EP_CREDIT,
1098 ep->ep_num | USB_DIR_IN,
1099 0, 0, ep->credit);
1100 ep->last_jiffies = now;
1101 ep->start_frame = 0;
1102 oz_event_log(OZ_EVT_EP_BUFFERING,
1103 ep->ep_num | USB_DIR_IN, 0, 0, 0);
1104 }
1105 continue;
1106 }
1107 ep->credit += jiffies_to_msecs(now - ep->last_jiffies);
regards,
dan carpenter
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