The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 781e14eaa7d168dc07d2a2eea5c55831a5bb46f3 Mon Sep 17 00:00:00 2001
From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Date: Wed, 10 Feb 2021 16:06:33 +0200
Subject: [PATCH] thunderbolt: Initialize HopID IDAs in tb_switch_alloc()
If there is a failure before the tb_switch_add() is called the switch
object is released by tb_switch_release() but at that point HopID IDAs
have not yet been initialized. So we see splat like this:
BUG: spinlock bad magic on CPU#2, kworker/u8:5/115
...
Workqueue: thunderbolt0 tb_handle_hotplug
Call Trace:
dump_stack+0x97/0xdc
? spin_bug+0x9a/0xa7
do_raw_spin_lock+0x68/0x98
_raw_spin_lock_irqsave+0x3f/0x5d
ida_destroy+0x4f/0x127
tb_switch_release+0x6d/0xfd
device_release+0x2c/0x7d
kobject_put+0x9b/0xbc
tb_handle_hotplug+0x278/0x452
process_one_work+0x1db/0x396
worker_thread+0x216/0x375
kthread+0x14d/0x155
? pr_cont_work+0x58/0x58
? kthread_blkcg+0x2e/0x2e
ret_from_fork+0x1f/0x40
Fix this by always initializing HopID IDAs in tb_switch_alloc().
Fixes: 0b2863ac3cfd ("thunderbolt: Add functions for allocating and releasing HopIDs")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Chiranjeevi Rapolu <chiranjeevi.rapolu@xxxxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index b63fecca6c2a..2a95b4ce06c0 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -768,12 +768,6 @@ static int tb_init_port(struct tb_port *port)
tb_dump_port(port->sw->tb, &port->config);
- /* Control port does not need HopID allocation */
- if (port->port) {
- ida_init(&port->in_hopids);
- ida_init(&port->out_hopids);
- }
-
INIT_LIST_HEAD(&port->list);
return 0;
@@ -1842,10 +1836,8 @@ static void tb_switch_release(struct device *dev)
dma_port_free(sw->dma_port);
tb_switch_for_each_port(sw, port) {
- if (!port->disabled) {
- ida_destroy(&port->in_hopids);
- ida_destroy(&port->out_hopids);
- }
+ ida_destroy(&port->in_hopids);
+ ida_destroy(&port->out_hopids);
}
kfree(sw->uuid);
@@ -2025,6 +2017,12 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
/* minimum setup for tb_find_cap and tb_drom_read to work */
sw->ports[i].sw = sw;
sw->ports[i].port = i;
+
+ /* Control port does not need HopID allocation */
+ if (i) {
+ ida_init(&sw->ports[i].in_hopids);
+ ida_init(&sw->ports[i].out_hopids);
+ }
}
ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
