rockchip: rockchip-inno-usb2: Fix Synchronous Abort on usb start

Fix NULL pointer dereference that happen when rockchip-inno-usb2 clock
enabled before device probe. This early clock enable call happen in process
of parent clock activation added in ac30d90f3367.

Fixes: 229218373c22 ("phy: rockchip-inno-usb2: Add support for clkout_ctl_phy").
Fixes: ac30d90f3367 ("clk: Ensure the parent clocks are enabled while reparenting")
Co-authored-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Alex Shumsky <alexthreed@gmail.com>
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
index 88b33de..3cc5956 100644 (file)
--- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
@@ -167,20 +167,27 @@ static struct phy_ops rockchip_usb2phy_ops = {
        .of_xlate = rockchip_usb2phy_of_xlate,
 };
 
-static void rockchip_usb2phy_clkout_ctl(struct clk *clk, struct regmap **base,
-                                       const struct usb2phy_reg **clkout_ctl)
+static int rockchip_usb2phy_clkout_ctl(struct clk *clk, struct regmap **base,
+                                      const struct usb2phy_reg **clkout_ctl)
 {
        struct udevice *parent = dev_get_parent(clk->dev);
        struct rockchip_usb2phy *priv = dev_get_priv(parent);
        const struct rockchip_usb2phy_cfg *phy_cfg = priv->phy_cfg;
 
-       if (priv->phy_cfg->clkout_ctl_phy.enable) {
+       // phy_cfg can be NULL if this function called before probe (when parent
+       // clocks are enabled)
+       if (!phy_cfg)
+               return -EINVAL;
+
+       if (phy_cfg->clkout_ctl_phy.enable) {
                *base = priv->phy_base;
                *clkout_ctl = &phy_cfg->clkout_ctl_phy;
        } else {
                *base = priv->reg_base;
                *clkout_ctl = &phy_cfg->clkout_ctl;
        }
+
+       return 0;
 }
 
 /**
@@ -206,7 +213,8 @@ int rockchip_usb2phy_clk_enable(struct clk *clk)
        const struct usb2phy_reg *clkout_ctl;
        struct regmap *base;
 
-       rockchip_usb2phy_clkout_ctl(clk, &base, &clkout_ctl);
+       if (rockchip_usb2phy_clkout_ctl(clk, &base, &clkout_ctl))
+               return -ENOSYS;
 
        /* turn on 480m clk output if it is off */
        if (!property_enabled(base, clkout_ctl)) {
@@ -230,7 +238,8 @@ int rockchip_usb2phy_clk_disable(struct clk *clk)
        const struct usb2phy_reg *clkout_ctl;
        struct regmap *base;
 
-       rockchip_usb2phy_clkout_ctl(clk, &base, &clkout_ctl);
+       if (rockchip_usb2phy_clkout_ctl(clk, &base, &clkout_ctl))
+               return -ENOSYS;
 
        /* turn off 480m clk output */
        property_enable(base, clkout_ctl, false);