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>

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 519ead2443c5630baaacaa4e1023e8ec766a2e39..b501346484aeb16ab5e92e91e9aaf2458bf04784 100644 (file)
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -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);