6.8-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 15b2e71b4653b3e13df34695a29ebeee237c5af2 upstream.
Suppose we sleep on the PPM lock after clearing the EVENT_PENDING bit because the thread for another connector is executing a command. In this case the command completion of the other command will still report the connector change for our connector.
Clear the EVENT_PENDING bit under the PPM lock to avoid another useless call to ucsi_handle_connector_change() in this case.
Fixes: c9aed03a0a68 ("usb: ucsi: Add missing ppm_lock") Cc: stable stable@kernel.org Signed-off-by: Christian A. Ehrhardt lk@c--e.de 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/20240320073927.1641788-2-lk@c--e.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/typec/ucsi/ucsi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -936,11 +936,11 @@ static void ucsi_handle_connector_change if (con->status.change & UCSI_CONSTAT_CAM_CHANGE) ucsi_partner_task(con, ucsi_check_altmodes, 1, 0);
- clear_bit(EVENT_PENDING, &con->ucsi->flags); - mutex_lock(&ucsi->ppm_lock); + clear_bit(EVENT_PENDING, &con->ucsi->flags); ret = ucsi_acknowledge_connector_change(ucsi); mutex_unlock(&ucsi->ppm_lock); + if (ret) dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);