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usb: ucsi: Add missing ppm_lock
commitc9aed03a0a
upstream. Calling ->sync_write must be done while holding the PPM lock as the mailbox logic does not support concurrent commands. At least since the addition of partner task this means that ucsi_acknowledge_connector_change should be called with the PPM lock held as it calls ->sync_write. Thus protect the only call to ucsi_acknowledge_connector_change with the PPM. All other calls to ->sync_write already happen under the PPM lock. Fixes:b9aa02ca39
("usb: typec: ucsi: Add polling mechanism for partner tasks like alt mode checking") Cc: stable@vger.kernel.org Signed-off-by: "Christian A. Ehrhardt" <lk@c--e.de> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20240121204123.275441-2-lk@c--e.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -831,7 +831,9 @@ static void ucsi_handle_connector_change(struct work_struct *work)
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clear_bit(EVENT_PENDING, &con->ucsi->flags);
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clear_bit(EVENT_PENDING, &con->ucsi->flags);
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mutex_lock(&ucsi->ppm_lock);
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ret = ucsi_acknowledge_connector_change(ucsi);
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ret = ucsi_acknowledge_connector_change(ucsi);
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mutex_unlock(&ucsi->ppm_lock);
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if (ret)
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if (ret)
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dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
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dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
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