[PATCH] remoteproc: st: fix check of syscon_regmap_lookup_by_phandle() return value

[Vladimir Zapolskiy]

syscon_regmap_lookup_by_phandle() returns either a valid pointer to
struct regmap or ERR_PTR() error value, check for NULL is invalid and
on error path may lead to oops, the change corrects the check.

Signed-off-by: Vladimir Zapolskiy <v...@mleia.com>
---
 drivers/remoteproc/st_remoteproc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/st_remoteproc.c 
b/drivers/remoteproc/st_remoteproc.c
index 6bb04d4..6f056ca 100644
--- a/drivers/remoteproc/st_remoteproc.c
+++ b/drivers/remoteproc/st_remoteproc.c
@@ -189,9 +189,9 @@ static int st_rproc_parse_dt(struct platform_device *pdev)
        }
 
        ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
-       if (!ddata->boot_base) {
+       if (IS_ERR(ddata->boot_base)) {
                dev_err(dev, "Boot base not found\n");
-               return -EINVAL;
+               return PTR_ERR(ddata->boot_base);
        }
 
        err = of_property_read_u32_index(np, "st,syscfg", 1,
-- 
2.1.4