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usb: dwc3: meson-g12a: fix USB2 PHY initialization on G12A and A1 SoCs

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dwc3_meson_g12a_usb2_init_phy() crashes with NULL pointer on an SM1
board (which uses the same USB setup as G12A) dereference as reported
by the Kernel CI bot. This is because of the following call flow:
  dwc3_meson_g12a_probe
    priv->drvdata->setup_regmaps
      dwc3_meson_g12a_setup_regmaps
        priv->usb2_ports is still 0 so priv->u2p_regmap[i] will be NULL
    dwc3_meson_g12a_get_phys
      initializes priv->usb2_ports
    priv->drvdata->usb_init
      dwc3_meson_g12a_usb_init
        dwc3_meson_g12a_usb_init_glue
          dwc3_meson_g12a_usb2_init
            priv->drvdata->usb2_init_phy
              dwc3_meson_g12a_usb2_init_phy
                dereferences priv->u2p_regmap[i]

Call priv->drvdata->setup_regmaps only after dwc3_meson_g12a_get_phys so
priv->usb2_ports is initialized and the regmaps will be set up
correctly. This fixes the NULL dereference later on.

Fixes: 013af227f5 ("usb: dwc3: meson-g12a: handle the phy and glue registers separately")
Reported-by: "kernelci.org bot" <bot@kernelci.org>
Acked-by: Felipe Balbi <balbi@kernel.org>
Acked-by: Neil Armstrong <narmstron@baylibre.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20200526202943.715220-3-martin.blumenstingl@googlemail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Blumenstingl 2020-05-26 22:29:43 +02:00 committed by Greg Kroah-Hartman
parent be8c1001a7
commit 347052e3bf
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/dwc3/dwc3-meson-g12a.c
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@ -708,11 +708,7 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
return PTR_ERR(base);
priv->drvdata = of_device_get_match_data(&pdev->dev);
priv->dev = dev;
ret = priv->drvdata->setup_regmaps(priv, base);
if (ret)
return ret;
priv->vbus = devm_regulator_get_optional(dev, "vbus");
if (IS_ERR(priv->vbus)) {
@ -749,6 +745,10 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
if (ret)
goto err_disable_clks;
ret = priv->drvdata->setup_regmaps(priv, base);
if (ret)
return ret;
if (priv->vbus) {
ret = regulator_enable(priv->vbus);
if (ret)