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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>
This commit is contained in:
Thierry Reding 2013-04-03 21:57:57 +02:00 committed by Greg Kroah-Hartman
parent eb5369edca
commit 369a9a9d2a
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/host/ehci-tegra.c
View File

@ -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);