5.15-stable review patch. If anyone has any objections, please let me know.
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From: Christian A. Ehrhardt lk@c--e.de
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@c--e.de Cc: stable stable@kernel.org Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com Tested-by: Neil Armstrong neil.armstrong@linaro.org # on SM8550-QRD Link: https://lore.kernel.org/r/20240320073927.1641788-4-lk@c--e.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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)