5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christian A. Ehrhardt <lk@xxxxxxx> commit 6b5c85ddeea77d18c4b69e3bda60e9374a20c304 upstream. If a command completes the OPM must send an ack. This applies to unsupported commands, too. Send the required ACK for unsupported commands. Signed-off-by: Christian A. Ehrhardt <lk@xxxxxxx> Cc: stable <stable@xxxxxxxxxx> Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> Tested-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx> # on SM8550-QRD Link: https://lore.kernel.org/r/20240320073927.1641788-4-lk@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/typec/ucsi/ucsi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -138,8 +138,12 @@ static int ucsi_exec_command(struct ucsi if (!(cci & UCSI_CCI_COMMAND_COMPLETE)) return -EIO; - if (cci & UCSI_CCI_NOT_SUPPORTED) + if (cci & UCSI_CCI_NOT_SUPPORTED) { + if (ucsi_acknowledge_command(ucsi) < 0) + dev_err(ucsi->dev, + "ACK of unsupported command failed\n"); return -EOPNOTSUPP; + } if (cci & UCSI_CCI_ERROR) { if (cmd == UCSI_GET_ERROR_STATUS)
