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xhci: move sanity checks 

The v variable goes negative for reg < 0x20.  Reorder the code
to first sanity check then calculate v and assign intr to make
sanity checkers happy.

Buglink: https://bugs.launchpad.net/qemu/+bug/1902112
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20201105134112.25119-7-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2020-11-05 14:41:12 +01:00
parent 22abfc96af
commit c590fe3aa2
1 changed files with 5 additions and 2 deletions
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7
hw/usb/hcd-xhci.c
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@ -3010,14 +3010,17 @@ static void xhci_runtime_write(void *ptr, hwaddr reg,
uint64_t val, unsigned size)
{
XHCIState *xhci = ptr;
int v = (reg - 0x20) / 0x20;
XHCIInterrupter *intr = &xhci->intr[v];
XHCIInterrupter *intr;
int v;
trace_usb_xhci_runtime_write(reg, val);
if (reg < 0x20) {
trace_usb_xhci_unimplemented("runtime write", reg);
return;
}
v = (reg - 0x20) / 0x20;
intr = &xhci->intr[v];
switch (reg & 0x1f) {
case 0x00: /* IMAN */