[PATCH v3 2/4] staging: vchiq: revert "switch to wait_for_completion_killable"

From: Nicolas Saenz Julienne
Date: Thu May 09 2019 - 10:33:25 EST

The killable version of wait_for_completion() is meant to be used on
situations where it should not fail at all costs, but still have the
convenience of being able to kill it if really necessary. VCHIQ doesn't
fit this criteria, as it's mainly used as an interface to V4L2 and ALSA
devices.

Fixes: a772f116702e ("staging: vchiq: switch to wait_for_completion_killable")
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
---
.../interface/vchiq_arm/vchiq_arm.c | 21 ++++++++++---------
.../interface/vchiq_arm/vchiq_core.c | 21 ++++++++++---------
.../interface/vchiq_arm/vchiq_util.c | 6 +++---
3 files changed, 25 insertions(+), 23 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 ab7d6a0ce94c..62d8f599e765 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -532,7 +532,8 @@ add_completion(VCHIQ_INSTANCE_T instance, VCHIQ_REASON_T reason,
vchiq_log_trace(vchiq_arm_log_level,
"%s - completion queue full", __func__);
DEBUG_COUNT(COMPLETION_QUEUE_FULL_COUNT);
- if (wait_for_completion_killable(&instance->remove_event)) {
+ if (wait_for_completion_interruptible(
+ &instance->remove_event)) {
vchiq_log_info(vchiq_arm_log_level,
"service_callback interrupted");
return VCHIQ_RETRY;
@@ -643,7 +644,7 @@ service_callback(VCHIQ_REASON_T reason, struct vchiq_header *header,
}

DEBUG_TRACE(SERVICE_CALLBACK_LINE);
- if (wait_for_completion_killable(
+ if (wait_for_completion_interruptible(
&user_service->remove_event)
!= 0) {
vchiq_log_info(vchiq_arm_log_level,
@@ -978,7 +979,7 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
has been closed until the client library calls the
CLOSE_DELIVERED ioctl, signalling close_event. */
if (user_service->close_pending &&
- wait_for_completion_killable(
+ wait_for_completion_interruptible(
&user_service->close_event))
status = VCHIQ_RETRY;
break;
@@ -1154,7 +1155,7 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

DEBUG_TRACE(AWAIT_COMPLETION_LINE);
mutex_unlock(&instance->completion_mutex);
- rc = wait_for_completion_killable(
+ rc = wait_for_completion_interruptible(
&instance->insert_event);
mutex_lock(&instance->completion_mutex);
if (rc != 0) {
@@ -1324,7 +1325,7 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
do {
spin_unlock(&msg_queue_spinlock);
DEBUG_TRACE(DEQUEUE_MESSAGE_LINE);
- if (wait_for_completion_killable(
+ if (wait_for_completion_interruptible(
&user_service->insert_event)) {
vchiq_log_info(vchiq_arm_log_level,
"DEQUEUE_MESSAGE interrupted");
@@ -2328,7 +2329,7 @@ vchiq_keepalive_thread_func(void *v)
while (1) {
long rc = 0, uc = 0;

- if (wait_for_completion_killable(&arm_state->ka_evt)
+ if (wait_for_completion_interruptible(&arm_state->ka_evt)
!= 0) {
vchiq_log_error(vchiq_susp_log_level,
"%s interrupted", __func__);
@@ -2579,7 +2580,7 @@ block_resume(struct vchiq_arm_state *arm_state)
write_unlock_bh(&arm_state->susp_res_lock);
vchiq_log_info(vchiq_susp_log_level, "%s wait for previously "
"blocked clients", __func__);
- if (wait_for_completion_killable_timeout(
+ if (wait_for_completion_interruptible_timeout(
&arm_state->blocked_blocker, timeout_val)
<= 0) {
vchiq_log_error(vchiq_susp_log_level, "%s wait for "
@@ -2605,7 +2606,7 @@ block_resume(struct vchiq_arm_state *arm_state)
write_unlock_bh(&arm_state->susp_res_lock);
vchiq_log_info(vchiq_susp_log_level, "%s wait for resume",
__func__);
- if (wait_for_completion_killable_timeout(
+ if (wait_for_completion_interruptible_timeout(
&arm_state->vc_resume_complete, timeout_val)
<= 0) {
vchiq_log_error(vchiq_susp_log_level, "%s wait for "
@@ -2812,7 +2813,7 @@ vchiq_arm_force_suspend(struct vchiq_state *state)
do {
write_unlock_bh(&arm_state->susp_res_lock);

- rc = wait_for_completion_killable_timeout(
+ rc = wait_for_completion_interruptible_timeout(
&arm_state->vc_suspend_complete,
msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS));

@@ -2908,7 +2909,7 @@ vchiq_arm_allow_resume(struct vchiq_state *state)
write_unlock_bh(&arm_state->susp_res_lock);

if (resume) {
- if (wait_for_completion_killable(
+ if (wait_for_completion_interruptible(
&arm_state->vc_resume_complete) < 0) {
vchiq_log_error(vchiq_susp_log_level,
"%s interrupted", __func__);
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
index 0c387b6473a5..c65cf1e6f910 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -560,7 +560,7 @@ reserve_space(struct vchiq_state *state, size_t space, int is_blocking)
remote_event_signal(&state->remote->trigger);

if (!is_blocking ||
- (wait_for_completion_killable(
+ (wait_for_completion_interruptible(
&state->slot_available_event)))
return NULL; /* No space available */
}
@@ -830,7 +830,7 @@ queue_message(struct vchiq_state *state, struct vchiq_service *service,
spin_unlock(&quota_spinlock);
mutex_unlock(&state->slot_mutex);

- if (wait_for_completion_killable(
+ if (wait_for_completion_interruptible(
&state->data_quota_event))
return VCHIQ_RETRY;

@@ -861,7 +861,7 @@ queue_message(struct vchiq_state *state, struct vchiq_service *service,
service_quota->slot_use_count);
VCHIQ_SERVICE_STATS_INC(service, quota_stalls);
mutex_unlock(&state->slot_mutex);
- if (wait_for_completion_killable(
+ if (wait_for_completion_interruptible(
&service_quota->quota_event))
return VCHIQ_RETRY;
if (service->closing)
@@ -1710,7 +1710,8 @@ parse_rx_slots(struct vchiq_state *state)
&service->bulk_rx : &service->bulk_tx;

DEBUG_TRACE(PARSE_LINE);
- if (mutex_lock_killable(&service->bulk_mutex)) {
+ if (mutex_lock_killable(
+ &service->bulk_mutex) != 0) {
DEBUG_TRACE(PARSE_LINE);
goto bail_not_ready;
}
@@ -2428,7 +2429,7 @@ vchiq_open_service_internal(struct vchiq_service *service, int client_id)
QMFLAGS_IS_BLOCKING);
if (status == VCHIQ_SUCCESS) {
/* Wait for the ACK/NAK */
- if (wait_for_completion_killable(&service->remove_event)) {
+ if (wait_for_completion_interruptible(&service->remove_event)) {
status = VCHIQ_RETRY;
vchiq_release_service_internal(service);
} else if ((service->srvstate != VCHIQ_SRVSTATE_OPEN) &&
@@ -2795,7 +2796,7 @@ vchiq_connect_internal(struct vchiq_state *state, VCHIQ_INSTANCE_T instance)
}

if (state->conn_state == VCHIQ_CONNSTATE_CONNECTING) {
- if (wait_for_completion_killable(&state->connect))
+ if (wait_for_completion_interruptible(&state->connect))
return VCHIQ_RETRY;

vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTED);
@@ -2894,7 +2895,7 @@ vchiq_close_service(VCHIQ_SERVICE_HANDLE_T handle)
}

while (1) {
- if (wait_for_completion_killable(&service->remove_event)) {
+ if (wait_for_completion_interruptible(&service->remove_event)) {
status = VCHIQ_RETRY;
break;
}
@@ -2955,7 +2956,7 @@ vchiq_remove_service(VCHIQ_SERVICE_HANDLE_T handle)
request_poll(service->state, service, VCHIQ_POLL_REMOVE);
}
while (1) {
- if (wait_for_completion_killable(&service->remove_event)) {
+ if (wait_for_completion_interruptible(&service->remove_event)) {
status = VCHIQ_RETRY;
break;
}
@@ -3038,7 +3039,7 @@ VCHIQ_STATUS_T vchiq_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle,
VCHIQ_SERVICE_STATS_INC(service, bulk_stalls);
do {
mutex_unlock(&service->bulk_mutex);
- if (wait_for_completion_killable(
+ if (wait_for_completion_interruptible(
&service->bulk_remove_event)) {
status = VCHIQ_RETRY;
goto error_exit;
@@ -3115,7 +3116,7 @@ VCHIQ_STATUS_T vchiq_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle,

if (bulk_waiter) {
bulk_waiter->bulk = bulk;
- if (wait_for_completion_killable(&bulk_waiter->event))
+ if (wait_for_completion_interruptible(&bulk_waiter->event))
status = VCHIQ_RETRY;
else if (bulk_waiter->actual == VCHIQ_BULK_ACTUAL_ABORTED)
status = VCHIQ_ERROR;
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c
index 6c519d8e48cb..8ee85c5e6f77 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c
@@ -50,7 +50,7 @@ void vchiu_queue_push(struct vchiu_queue *queue, struct vchiq_header *header)
return;

while (queue->write == queue->read + queue->size) {
- if (wait_for_completion_killable(&queue->pop))
+ if (wait_for_completion_interruptible(&queue->pop))
flush_signals(current);
}

@@ -63,7 +63,7 @@ void vchiu_queue_push(struct vchiu_queue *queue, struct vchiq_header *header)
struct vchiq_header *vchiu_queue_peek(struct vchiu_queue *queue)
{
while (queue->write == queue->read) {
- if (wait_for_completion_killable(&queue->push))
+ if (wait_for_completion_interruptible(&queue->push))
flush_signals(current);
}

@@ -77,7 +77,7 @@ struct vchiq_header *vchiu_queue_pop(struct vchiu_queue *queue)
struct vchiq_header *header;

while (queue->write == queue->read) {
- if (wait_for_completion_killable(&queue->push))
+ if (wait_for_completion_interruptible(&queue->push))
flush_signals(current);
}

--
2.21.0