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xhci: add asserts to help with static code analysis 

Most callers of xhci_port_update() and xhci_wakeup() pass in a pointer
to an array entry and can never be NULL but add two defensive asserts
to protect against future changes (e.g. adding a new port speed, etc.)
adding a path through xhci_lookup_port() that could result in the
return of a NULL XHCIPort.

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 1549460216-25808-3-git-send-email-liam.merwick@oracle.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Liam Merwick 2019-02-06 13:36:49 +00:00 committed by Gerd Hoffmann
parent 56090d78a7
commit 92cf34279c
1 changed files with 2 additions and 0 deletions
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2
hw/usb/hcd-xhci.c
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@ -2607,6 +2607,7 @@ static void xhci_port_update(XHCIPort *port, int is_detach)
{
uint32_t pls = PLS_RX_DETECT;
assert(port);
port->portsc = PORTSC_PP;
if (!is_detach && xhci_port_have_device(port)) {
port->portsc |= PORTSC_CCS;
@ -3215,6 +3216,7 @@ static void xhci_wakeup(USBPort *usbport)
XHCIState *xhci = usbport->opaque;
XHCIPort *port = xhci_lookup_port(xhci, usbport);
assert(port);
if (get_field(port->portsc, PORTSC_PLS) != PLS_U3) {
return;
}