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usb: ucsi: Add missing ppm_lock 

commit c9aed03a0a683fd1600ea92f2ad32232d4736272 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>
This commit is contained in:
Christian A. Ehrhardt 2024-01-21 21:41:21 +01:00 committed by Greg Kroah-Hartman
parent ad42f80871
commit d25f43a257
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/typec/ucsi/ucsi.c
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@ -935,7 +935,9 @@ static void ucsi_handle_connector_change(struct work_struct *work)
clear_bit(EVENT_PENDING, &con->ucsi->flags);
mutex_lock(&ucsi->ppm_lock);
ret = ucsi_acknowledge_connector_change(ucsi);
mutex_unlock(&ucsi->ppm_lock);
if (ret)
dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);