usb: phy: msm: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.
Even if the probability of this case is very low, fixing it made
static analyzers happy.
Solving this with of_device_get_match_data made also code simplier.

Reported-by: coverity (CID 1324133)
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index 80eb991c2506c758315cc2e6e1f39b6ebbf319f4..0d19a6d61a71f7ccb7a55e1b90a7d5d5f27db535 100644 (file)
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -1506,7 +1506,6 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 {
        struct msm_otg_platform_data *pdata;
        struct extcon_dev *ext_id, *ext_vbus;
-       const struct of_device_id *id;
        struct device_node *node = pdev->dev.of_node;
        struct property *prop;
        int len, ret, words;
@@ -1518,8 +1517,9 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 
        motg->pdata = pdata;
 
-       id = of_match_device(msm_otg_dt_match, &pdev->dev);
-       pdata->phy_type = (enum msm_usb_phy_type) id->data;
+       pdata->phy_type = (enum msm_usb_phy_type)of_device_get_match_data(&pdev->dev);
+       if (!pdata->phy_type)
+               return 1;
 
        motg->link_rst = devm_reset_control_get(&pdev->dev, "link");
        if (IS_ERR(motg->link_rst))