Driver currently crashes due to NULL pointer deference while updating PHY tune register if nvmem cell is NULL. Since, fused value for Tune1/2 register is optional, we'd rather bail out.

Fixes: ca04d9d3e1b1 ("phy: qcom-qusb2: New driver for QUSB2 PHY on Qcom chips") Reviewed-by: Vivek Gautam vivek.gautam@codeaurora.org Reviewed-by: Evan Green evgreen@chromium.org Cc: stable stable@vger.kernel.org # 4.14+ Signed-off-by: Manu Gautam mgautam@codeaurora.org --- drivers/phy/qualcomm/phy-qcom-qusb2.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-qusb2.c b/drivers/phy/qualcomm/phy-qcom-qusb2.c index 94afeac..40fdef8 100644 --- a/drivers/phy/qualcomm/phy-qcom-qusb2.c +++ b/drivers/phy/qualcomm/phy-qcom-qusb2.c @@ -315,6 +315,10 @@ static void qusb2_phy_set_tune2_param(struct qusb2_phy *qphy) const struct qusb2_phy_cfg *cfg = qphy->cfg; u8 *val;

+ /* efuse register is optional */ + if (!qphy->cell) + return; + /* * Read efuse register having TUNE2/1 parameter's high nibble. * If efuse register shows value as 0x0, or if we fail to find