linux-kernel - [PATCH] i2c: designware-platdrv: handle reset control deassert error

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Message-ID: <20251009083703.2038187-1-a.shimko.dev@gmail.com>
Date: Thu,  9 Oct 2025 11:37:03 +0300
From: Artem Shimko <a.shimko.dev@...il.com>
To: p.zabel@...gutronix.de
Cc: a.shimko.dev@...il.com,
	andi.shyti@...nel.org,
	andriy.shevchenko@...ux.intel.com,
	jarkko.nikula@...ux.intel.com,
	jsd@...ihalf.com,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	mika.westerberg@...ux.intel.com
Subject: [PATCH] i2c: designware-platdrv: handle reset control deassert error

Handle the error returned by reset_control_deassert() in the probe
function to prevent continuing probe when reset deassertion fails.

Previously, reset_control_deassert() was called without checking its
return value, which could lead to probe continuing even when the
device reset wasn't properly deasserted.

The fix checks the return value and returns an error with dev_err_probe()
if reset deassertion fails, providing better error handling and
diagnostics.

Signed-off-by: Artem Shimko <a.shimko.dev@...il.com>
---
Hi Philipp,

Oh, sorry, sure.

Could you please have a look at the v2.

Thank you

Best regards,
Artem Shimko

ChangeLog:
  v1:
    * https://lore.kernel.org/all/20251009074443.2010699-1-a.shimko.dev@gmail.com/
  v2:
    * change pdev->dev to local device dev

 drivers/i2c/busses/i2c-designware-platdrv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index a35e4c64a1d4..c89af7cbdfac 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -240,7 +240,9 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 	if (IS_ERR(dev->rst))
 		return PTR_ERR(dev->rst);
 
-	reset_control_deassert(dev->rst);
+	ret = reset_control_deassert(dev->rst);
+	if (ret)
+		return dev_err_probe(device, ret, "Failed to deassert reset\n");
 
 	ret = i2c_dw_fw_parse_and_configure(dev);
 	if (ret)
-- 
2.43.0