From: Thierry Reding <thierry@gilfi.de>
Date: Wed, 3 Apr 2013 19:57:57 +0000 (+0200)
Subject: usb: host: ehci-tegra: Fix oops in error cleanup
X-Git-Tag: upstream/snapshot3+hdmi~5288^2~68
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=369a9a9d2af702bac3ccd2ade86ddcb2594eb3b1;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

usb: host: ehci-tegra: Fix oops in error cleanup

The cleanup path checks whether the transceiver was properly initialized
using IS_ERR(). However it can also happen that the cleanup path is run
before the transceiver was initialized (or the operating mode isn't set
to TEGRA_USB_OTG) and is therefore NULL. Add a separate label for error
unwinding and initialize the transceiver field to ERR_PTR(-ENODEV) when
the operating mode isn't TEGRA_USB_OTG to allow for consistent checking.

Signed-off-by: Thierry Reding <thierry@gilfi.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 83d190a..4f3cfb8 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -760,7 +760,7 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 	err = usb_phy_set_suspend(hcd->phy, 0);
 	if (err) {
 		dev_err(&pdev->dev, "Failed to power on the phy\n");
-		goto fail;
+		goto fail_phy;
 	}
 
 	tegra->host_resumed = 1;
@@ -770,7 +770,7 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 	if (!irq) {
 		dev_err(&pdev->dev, "Failed to get IRQ\n");
 		err = -ENODEV;
-		goto fail;
+		goto fail_phy;
 	}
 
 #ifdef CONFIG_USB_OTG_UTILS
@@ -779,6 +779,8 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 			devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 		if (!IS_ERR_OR_NULL(tegra->transceiver))
 			otg_set_host(tegra->transceiver->otg, &hcd->self);
+	} else {
+		tegra->transceiver = ERR_PTR(-ENODEV);
 	}
 #endif
 
@@ -803,6 +805,7 @@ fail:
 	if (!IS_ERR_OR_NULL(tegra->transceiver))
 		otg_set_host(tegra->transceiver->otg, NULL);
 #endif
+fail_phy:
 	usb_phy_shutdown(hcd->phy);
 fail_io:
 	clk_disable_unprepare(tegra->clk);