Check the return value of 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.

Fixes: acbdad8dd1ab ("serial: 8250_dw: simplify optional reset handling") Cc: stable@vger.kernel.org Signed-off-by: Artem Shimko a.shimko.dev@gmail.com --- Hi,

Done.

Thank you!

Best regards, Artem Shimko

ChangeLog: v1: * https://lore.kernel.org/all/20251009081309.2021600-1-a.shimko.dev@gmail.com/... v2: * https://lore.kernel.org/all/20251019085325.250657-1-a.shimko.dev@gmail.com/ v3: * Add Cc: stable@vger.kernel.org

drivers/tty/serial/8250/8250_dw.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index a53ba04d9770..710ae4d40aec 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -635,7 +635,9 @@ static int dw8250_probe(struct platform_device *pdev) if (IS_ERR(data->rst)) return PTR_ERR(data->rst);

- reset_control_deassert(data->rst); + err = reset_control_deassert(data->rst); + if (err) + return dev_err_probe(dev, err, "failed to deassert resets\n");

err = devm_add_action_or_reset(dev, dw8250_reset_control_assert, data->rst); if (err)