usb: phy: mxs: suspend to RAM causes NULL pointer dereference

Triggering suspend to RAM via sysfs on a i.MX28 causes a NULL pointer
dereference. This patch avoids the oops in mxs_phy_get_vbus_status()
by aborting since there is no syscon available.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fixes: efdbd3a5d6e ("usb: phy: mxs: do not set PWD.RXPWD1PT1 for low speed connection")
CC: <stable@vger.kernel.org> # 4.0
Acked-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index 8f7cb068d29bab1eb1f9641e41cbe4da30e22489..3fcc0483a0811e8f7e2984aea1c4a11ce2da0951 100644 (file)
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -217,6 +217,9 @@ static bool mxs_phy_get_vbus_status(struct mxs_phy *mxs_phy)
 {
        unsigned int vbus_value;
 
+       if (!mxs_phy->regmap_anatop)
+               return false;
+
        if (mxs_phy->port_id == 0)
                regmap_read(mxs_phy->regmap_anatop,
                        ANADIG_USB1_VBUS_DET_STAT,