ehci-dbg.c:656 fill_periodic_buffer() warn: variable dereferenced before check 'p.qh' (see line 599)

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Hi Richard,

FYI, there are new smatch warnings show up in

commit 3807e26d69b9ad3864fe03224ebebc9610d5802e
Author:     Alek Du <alek.du@xxxxxxxxx>
AuthorDate: Tue Jul 14 07:23:29 2009 +0800

drivers/usb/chipidea/../host/ehci-dbg.c:656 fill_periodic_buffer() warn: variable dereferenced before check 'p.qh' (see line 599)

vim +656 drivers/usb/chipidea/../host/ehci-dbg.c
   596 
   597                         switch (hc32_to_cpu(ehci, tag)) {
   598                         case Q_TYPE_QH:
   599                                 hw = p.qh->hw;
...
 > 656					if (p.qh) {
   657						tag = Q_NEXT_TYPE(ehci, hw->hw_next);
   658						p = p.qh->qh_next;
   659					}
   660					break;

---
0-DAY kernel build testing backend         Open Source Technology Centre
Fengguang Wu <wfg@xxxxxxxxxxxxxxx>                     Intel Corporation
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