This is a note to let you know that I've just added the patch titled
usb: typec: tcpm: fix create duplicate source-capabilities file
to the 6.2-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-tcpm-fix-create-duplicate-source-capabilities-file.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a826492fc9dfe32afd70fff93955ae8174bbf14b Mon Sep 17 00:00:00 2001
From: Xu Yang <xu.yang_2@xxxxxxx>
Date: Wed, 15 Feb 2023 13:49:51 +0800
Subject: usb: typec: tcpm: fix create duplicate source-capabilities file
From: Xu Yang <xu.yang_2@xxxxxxx>
commit a826492fc9dfe32afd70fff93955ae8174bbf14b upstream.
The kernel will dump in the below cases:
sysfs: cannot create duplicate filename
'/devices/virtual/usb_power_delivery/pd1/source-capabilities'
1. After soft reset has completed, an Explicit Contract negotiation occurs.
The sink device will receive source capabilitys again. This will cause
a duplicate source-capabilities file be created.
2. Power swap twice on a device that is initailly sink role.
This will unregister existing capabilities when above cases occurs.
Fixes: 8203d26905ee ("usb: typec: tcpm: Register USB Power Delivery Capabilities")
cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Xu Yang <xu.yang_2@xxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230215054951.238394-1-xu.yang_2@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/typec/tcpm/tcpm.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4547,6 +4547,9 @@ static void run_state_machine(struct tcp
case SOFT_RESET:
port->message_id = 0;
port->rx_msgid = -1;
+ /* remove existing capabilities */
+ usb_power_delivery_unregister_capabilities(port->partner_source_caps);
+ port->partner_source_caps = NULL;
tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
tcpm_ams_finish(port);
if (port->pwr_role == TYPEC_SOURCE) {
@@ -4566,6 +4569,9 @@ static void run_state_machine(struct tcp
case SOFT_RESET_SEND:
port->message_id = 0;
port->rx_msgid = -1;
+ /* remove existing capabilities */
+ usb_power_delivery_unregister_capabilities(port->partner_source_caps);
+ port->partner_source_caps = NULL;
if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
tcpm_set_state_cond(port, hard_reset_state(port), 0);
else
@@ -4695,6 +4701,9 @@ static void run_state_machine(struct tcp
tcpm_set_state(port, SNK_STARTUP, 0);
break;
case PR_SWAP_SNK_SRC_SINK_OFF:
+ /* will be source, remove existing capabilities */
+ usb_power_delivery_unregister_capabilities(port->partner_source_caps);
+ port->partner_source_caps = NULL;
/*
* Prevent vbus discharge circuit from turning on during PR_SWAP
* as this is not a disconnect.
Patches currently in stable-queue which might be from xu.yang_2@xxxxxxx are
queue-6.2/usb-typec-tcpm-fix-warning-when-handle-discover_identity-message.patch
queue-6.2/usb-chipidea-core-fix-possible-concurrent-when-switch-role.patch
queue-6.2/usb-chipdea-core-fix-return-einval-if-request-role-is-the-same-with-current-role.patch
queue-6.2/usb-typec-tcpm-fix-create-duplicate-source-capabilities-file.patch
