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usb: chipidea: fix no transceiver case 

Since usb phy code does return ERR_PTR() values, make sure that we don't
end up dereferencing them. This is a problem, for example, on platforms
that don't register a phy for chipidea since b7fa5c2a ("usb: phy: return
-ENXIO when PHY layer isn't enabled").

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2013-06-11 13:41:47 +03:00 committed by Greg Kroah-Hartman
parent 2d8f4447b5
commit d343f4e8d6
1 changed files with 8 additions and 5 deletions
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13
drivers/usb/chipidea/udc.c
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@ -1678,8 +1678,11 @@ static int udc_start(struct ci13xxx *ci)
ci->gadget.ep0 = &ci->ep0in->ep;
if (ci->global_phy)
if (ci->global_phy) {
ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR(ci->transceiver))
ci->transceiver = NULL;
}
if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
if (ci->transceiver == NULL) {
@ -1694,7 +1697,7 @@ static int udc_start(struct ci13xxx *ci)
goto put_transceiver;
}
if (!IS_ERR_OR_NULL(ci->transceiver)) {
if (ci->transceiver) {
retval = otg_set_peripheral(ci->transceiver->otg,
&ci->gadget);
if (retval)
@ -1711,7 +1714,7 @@ static int udc_start(struct ci13xxx *ci)
return retval;
remove_trans:
if (!IS_ERR_OR_NULL(ci->transceiver)) {
if (ci->transceiver) {
otg_set_peripheral(ci->transceiver->otg, NULL);
if (ci->global_phy)
usb_put_phy(ci->transceiver);
@ -1719,7 +1722,7 @@ remove_trans:
dev_err(dev, "error = %i\n", retval);
put_transceiver:
if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
if (ci->transceiver && ci->global_phy)
usb_put_phy(ci->transceiver);
destroy_eps:
destroy_eps(ci);
@ -1747,7 +1750,7 @@ static void udc_stop(struct ci13xxx *ci)
dma_pool_destroy(ci->td_pool);
dma_pool_destroy(ci->qh_pool);
if (!IS_ERR_OR_NULL(ci->transceiver)) {
if (ci->transceiver) {
otg_set_peripheral(ci->transceiver->otg, NULL);
if (ci->global_phy)
usb_put_phy(ci->transceiver);