This is a note to let you know that I've just added the patch titled
usb: typec: ucsi: Clear EVENT_PENDING under PPM lock
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-typec-ucsi-clear-event_pending-under-ppm-lock.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 15b2e71b4653b3e13df34695a29ebeee237c5af2 Mon Sep 17 00:00:00 2001
From: "Christian A. Ehrhardt" <lk@xxxxxxx>
Date: Wed, 20 Mar 2024 08:39:22 +0100
Subject: usb: typec: ucsi: Clear EVENT_PENDING under PPM lock
From: Christian A. Ehrhardt <lk@xxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Christian A. Ehrhardt <lk@xxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Tested-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx> # on SM8550-QRD
Link: https://lore.kernel.org/r/20240320073927.1641788-2-lk@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
Patches currently in stable-queue which might be from lk@xxxxxxx are
queue-6.8/usb-typec-ucsi-check-for-notifications-after-init.patch
queue-6.8/usb-typec-ucsi_acpi-refactor-and-fix-dell-quirk.patch
queue-6.8/usb-typec-ucsi-clear-event_pending-under-ppm-lock.patch
queue-6.8/usb-typec-ucsi-ack-unsupported-commands.patch
queue-6.8/usb-typec-ucsi-clear-ucsi_cci_reset_complete-before-reset.patch
