From d343f4e8d6e4e4237b25b32e4f6a09d1281d4ca3 Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Tue, 11 Jun 2013 13:41:47 +0300 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/chipidea/udc.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c index 519ead2..b501346 100644 --- 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); -- 2.7.4