6.6-stable review patch. If anyone has any objections, please let me know.
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From: Andy Shevchenko andriy.shevchenko@linux.intel.com
commit e8486bd50ecf63c9a1e25271f258a8d959f2672f upstream.
The documentation of the __uart_read_properties() states that ->iotype member is always altered after the function call, but the code doesn't do that in the case when use_defaults == false and the value of reg-io-width is unsupported. Make sure the code follows the documentation.
Note, the current users of the uart_read_and_validate_port_properties() will fail and the change doesn't affect their behaviour, neither users of uart_read_port_properties() will be affected since the alteration happens there even in the current code flow.
Fixes: e894b6005dce ("serial: port: Introduce a common helper to read properties") Cc: stable stable@kernel.org Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Link: https://lore.kernel.org/r/20250124161530.398361-3-andriy.shevchenko@linux.in... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/serial_port.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/serial_port.c +++ b/drivers/tty/serial/serial_port.c @@ -227,11 +227,11 @@ static int __uart_read_properties(struct port->iotype = device_is_big_endian(dev) ? UPIO_MEM32BE : UPIO_MEM32; break; default: + port->iotype = UPIO_UNKNOWN; if (!use_defaults) { dev_err(dev, "Unsupported reg-io-width (%u)\n", value); return -EINVAL; } - port->iotype = UPIO_UNKNOWN; break; } }