Commit 4879efb3 authored by Steinar H. Gunderson's avatar Steinar H. Gunderson Committed by Felipe Balbi

usb: dwc3: exynos: Fix deferred probing storm.

dwc3-exynos has two problems during init if the regulators are slow
to come up (for instance if the I2C bus driver is not on the initramfs)
and return probe deferral. First, every time this happens, the driver
leaks the USB phys created; they need to be deallocated on error.

Second, since the phy devices are created before the regulators fail,
this means that there's a new device to re-trigger deferred probing,
which causes it to essentially go into a busy loop of re-probing the
device until the regulators come up.

Move the phy creation to after the regulators have succeeded, and also
fix cleanup on failure. On my ODROID XU4 system (with Debian's initramfs
which doesn't contain the I2C driver), this reduces the number of probe
attempts (for each of the two controllers) from more than 2000 to eight.
Signed-off-by: default avatarSteinar H. Gunderson <sesse@google.com>
Reviewed-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: default avatarVivek Gautam <gautam.vivek@samsung.com>
Fixes: d720f057 ("usb: dwc3: exynos: add nop transceiver support")
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent f1bddbb3
...@@ -128,12 +128,6 @@ static int dwc3_exynos_probe(struct platform_device *pdev) ...@@ -128,12 +128,6 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, exynos); platform_set_drvdata(pdev, exynos);
ret = dwc3_exynos_register_phys(exynos);
if (ret) {
dev_err(dev, "couldn't register PHYs\n");
return ret;
}
exynos->dev = dev; exynos->dev = dev;
exynos->clk = devm_clk_get(dev, "usbdrd30"); exynos->clk = devm_clk_get(dev, "usbdrd30");
...@@ -183,20 +177,29 @@ static int dwc3_exynos_probe(struct platform_device *pdev) ...@@ -183,20 +177,29 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
goto err3; goto err3;
} }
ret = dwc3_exynos_register_phys(exynos);
if (ret) {
dev_err(dev, "couldn't register PHYs\n");
goto err4;
}
if (node) { if (node) {
ret = of_platform_populate(node, NULL, NULL, dev); ret = of_platform_populate(node, NULL, NULL, dev);
if (ret) { if (ret) {
dev_err(dev, "failed to add dwc3 core\n"); dev_err(dev, "failed to add dwc3 core\n");
goto err4; goto err5;
} }
} else { } else {
dev_err(dev, "no device node, failed to add dwc3 core\n"); dev_err(dev, "no device node, failed to add dwc3 core\n");
ret = -ENODEV; ret = -ENODEV;
goto err4; goto err5;
} }
return 0; return 0;
err5:
platform_device_unregister(exynos->usb2_phy);
platform_device_unregister(exynos->usb3_phy);
err4: err4:
regulator_disable(exynos->vdd10); regulator_disable(exynos->vdd10);
err3: err3:
......
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