[PATCH v2] phy: ocelot-serdes: Fix IS_ERR() vs NULL bug in serdes_probe()

[Jinjie Ruan]

dev_get_regmap() call can return a null pointer. It will not return
error pointers. Thus apply a null pointer check instead.

Cc: stable at vger.kernel.org
Fixes: 672faa7bbf60 ("phy: phy-ocelot-serdes: add ability to be used in a non-syscon configuration")
Acked-by: Colin Foster <colin.foster at in-advantage.com>
Signed-off-by: Jinjie Ruan <ruanjinjie at huawei.com>
---
v2:
- Add Acked-by.
- Update the commit message as Markus suggested.
---
 drivers/phy/mscc/phy-ocelot-serdes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/mscc/phy-ocelot-serdes.c b/drivers/phy/mscc/phy-ocelot-serdes.c
index 1cd1b5db2ad7..77ca67ce6e91 100644
--- a/drivers/phy/mscc/phy-ocelot-serdes.c
+++ b/drivers/phy/mscc/phy-ocelot-serdes.c
@@ -512,8 +512,8 @@ static int serdes_probe(struct platform_device *pdev)
 						    res->name);
 	}
 
-	if (IS_ERR(ctrl->regs))
-		return PTR_ERR(ctrl->regs);
+	if (!ctrl->regs)
+		return -EINVAL;
 
 	for (i = 0; i < SERDES_MAX; i++) {
 		ret = serdes_phy_create(ctrl, i, &ctrl->phys[i]);
-- 
2.34.1