[PATCH v2] pinctrl: mcp23s08: Propagate reset GPIO errors

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

devm_gpiod_get_optional() may return -EPROBE_DEFER or other errors,
but mcp23s08_probe_one() currently ignores them.

Check the return value and propagate errors from the reset GPIO lookup.

Fixes: 4e73bfa3ee37 ("pinctrl: mcp23s08: Add optional reset GPIO")
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v2:
 -return ERR_PTR(-EPROBE_DEFER) instead of uninitialized ret variable

 drivers/pinctrl/pinctrl-mcp23s08.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index cc668f84bf8b..259ac02134c6 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -613,6 +613,9 @@ int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 	mcp->chip.owner = THIS_MODULE;
 
 	mcp->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(mcp->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(mcp->reset_gpio),
+				     "failed to get reset GPIO\n");
 
 	/* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
 	 * and MCP_IOCON.HAEN = 1, so we work with all chips.
-- 
2.43.0