scsi: ufs: ufs-exynos: Fix return value check in exynos_ufs_init()

In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Link: https://lore.kernel.org/r/20200618133837.127274-1-weiyongjun1@huawei.com
Fixes: 55f4b1f73631 ("scsi: ufs: ufs-exynos: Add UFS host support for Exynos SoCs")
Reported-by: Hulk Robot <hulkci@huawei.com>
Acked-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufs-exynos.c b/drivers/scsi/ufs/ufs-exynos.c
index 0a9e990..16544b3 100644 (file)
--- a/drivers/scsi/ufs/ufs-exynos.c
+++ b/drivers/scsi/ufs/ufs-exynos.c
@@ -950,25 +950,25 @@ static int exynos_ufs_init(struct ufs_hba *hba)
        /* exynos-specific hci */
        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vs_hci");
        ufs->reg_hci = devm_ioremap_resource(dev, res);
-       if (!ufs->reg_hci) {
+       if (IS_ERR(ufs->reg_hci)) {
                dev_err(dev, "cannot ioremap for hci vendor register\n");
-               return -ENOMEM;
+               return PTR_ERR(ufs->reg_hci);
        }
 
        /* unipro */
        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "unipro");
        ufs->reg_unipro = devm_ioremap_resource(dev, res);
-       if (!ufs->reg_unipro) {
+       if (IS_ERR(ufs->reg_unipro)) {
                dev_err(dev, "cannot ioremap for unipro register\n");
-               return -ENOMEM;
+               return PTR_ERR(ufs->reg_unipro);
        }
 
        /* ufs protector */
        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ufsp");
        ufs->reg_ufsp = devm_ioremap_resource(dev, res);
-       if (!ufs->reg_ufsp) {
+       if (IS_ERR(ufs->reg_ufsp)) {
                dev_err(dev, "cannot ioremap for ufs protector register\n");
-               return -ENOMEM;
+               return PTR_ERR(ufs->reg_ufsp);
        }
 
        ret = exynos_ufs_parse_dt(dev, ufs);