[PATCH 2/3] Revert "staging: vchiq_arm: Create keep-alive thread during probe"
Stefan Wahren
wahrenst at gmx.net
Fri Jul 11 08:40:30 PDT 2025
The commit 86bc88217006 ("staging: vchiq_arm: Create keep-alive thread
during probe") introduced a regression for certain configurations,
which doesn't have a VCHIQ user. This results in a unused and hanging
keep-alive thread:
INFO: task vchiq-keep/0:85 blocked for more than 120 seconds.
Not tainted 6.12.34-v8-+ #13
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:vchiq-keep/0 state:D stack:0 pid:85 tgid:85 ppid:2
Call trace:
__switch_to+0x188/0x230
__schedule+0xa54/0xb28
schedule+0x80/0x120
schedule_preempt_disabled+0x30/0x50
kthread+0xd4/0x1a0
ret_from_fork+0x10/0x20
Fixes: 86bc88217006 ("staging: vchiq_arm: Create keep-alive thread during probe")
Reported-by: Maíra Canal <maira.canal at usp.br>
Closes: https://lore.kernel.org/linux-staging/ba35b960-a981-4671-9f7f-060da10feaa1@usp.br/
Cc: <stable at kernel.org>
Signed-off-by: Stefan Wahren <wahrenst at gmx.net>
---
.../interface/vchiq_arm/vchiq_arm.c | 69 ++++++++++---------
1 file changed, 35 insertions(+), 34 deletions(-)
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index cdf5687ad4f0..6434cbdc1a6e 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -280,6 +280,29 @@ static int vchiq_platform_init(struct platform_device *pdev, struct vchiq_state
return 0;
}
+int
+vchiq_platform_init_state(struct vchiq_state *state)
+{
+ struct vchiq_arm_state *platform_state;
+
+ platform_state = devm_kzalloc(state->dev, sizeof(*platform_state), GFP_KERNEL);
+ if (!platform_state)
+ return -ENOMEM;
+
+ rwlock_init(&platform_state->susp_res_lock);
+
+ init_completion(&platform_state->ka_evt);
+ atomic_set(&platform_state->ka_use_count, 0);
+ atomic_set(&platform_state->ka_use_ack_count, 0);
+ atomic_set(&platform_state->ka_release_count, 0);
+
+ platform_state->state = state;
+
+ state->platform_state = (struct opaque_platform_state *)platform_state;
+
+ return 0;
+}
+
static struct vchiq_arm_state *vchiq_platform_get_arm_state(struct vchiq_state *state)
{
return (struct vchiq_arm_state *)state->platform_state;
@@ -988,39 +1011,6 @@ vchiq_keepalive_thread_func(void *v)
return 0;
}
-int
-vchiq_platform_init_state(struct vchiq_state *state)
-{
- struct vchiq_arm_state *platform_state;
- char threadname[16];
-
- platform_state = devm_kzalloc(state->dev, sizeof(*platform_state), GFP_KERNEL);
- if (!platform_state)
- return -ENOMEM;
-
- snprintf(threadname, sizeof(threadname), "vchiq-keep/%d",
- state->id);
- platform_state->ka_thread = kthread_create(&vchiq_keepalive_thread_func,
- (void *)state, threadname);
- if (IS_ERR(platform_state->ka_thread)) {
- dev_err(state->dev, "couldn't create thread %s\n", threadname);
- return PTR_ERR(platform_state->ka_thread);
- }
-
- rwlock_init(&platform_state->susp_res_lock);
-
- init_completion(&platform_state->ka_evt);
- atomic_set(&platform_state->ka_use_count, 0);
- atomic_set(&platform_state->ka_use_ack_count, 0);
- atomic_set(&platform_state->ka_release_count, 0);
-
- platform_state->state = state;
-
- state->platform_state = (struct opaque_platform_state *)platform_state;
-
- return 0;
-}
-
int
vchiq_use_internal(struct vchiq_state *state, struct vchiq_service *service,
enum USE_TYPE_E use_type)
@@ -1341,6 +1331,7 @@ void vchiq_platform_conn_state_changed(struct vchiq_state *state,
enum vchiq_connstate newstate)
{
struct vchiq_arm_state *arm_state = vchiq_platform_get_arm_state(state);
+ char threadname[16];
dev_dbg(state->dev, "suspend: %d: %s->%s\n",
state->id, get_conn_state_name(oldstate), get_conn_state_name(newstate));
@@ -1355,7 +1346,17 @@ void vchiq_platform_conn_state_changed(struct vchiq_state *state,
arm_state->first_connect = 1;
write_unlock_bh(&arm_state->susp_res_lock);
- wake_up_process(arm_state->ka_thread);
+ snprintf(threadname, sizeof(threadname), "vchiq-keep/%d",
+ state->id);
+ arm_state->ka_thread = kthread_create(&vchiq_keepalive_thread_func,
+ (void *)state,
+ threadname);
+ if (IS_ERR(arm_state->ka_thread)) {
+ dev_err(state->dev, "suspend: Couldn't create thread %s\n",
+ threadname);
+ } else {
+ wake_up_process(arm_state->ka_thread);
+ }
}
static const struct of_device_id vchiq_of_match[] = {
--
2.34.1
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