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staging: greybus: remove unused kfifo_ts

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As of commit 8e1d6c336d ("greybus: loopback: drop bus aggregate
calculation"), nothing ever reads from kfifo_ts, so there is no
reason to write to it or even allocate it any more.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2017-11-02 15:32:51 +01:00 committed by Greg Kroah-Hartman
parent 7a6038f289
commit 8563a49c43
1 changed files with 3 additions and 24 deletions
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27
drivers/staging/greybus/loopback.c
View file

@ -72,7 +72,6 @@ struct gb_loopback {
struct dentry *file;
struct kfifo kfifo_lat;
struct kfifo kfifo_ts;
struct mutex mutex;
struct task_struct *task;
struct list_head entry;
@ -262,7 +261,6 @@ static void gb_loopback_check_attr(struct gb_loopback *gb)
gb->iteration_max, kfifo_depth);
}
kfifo_reset_out(&gb->kfifo_lat);
kfifo_reset_out(&gb->kfifo_ts);
switch (gb->type) {
case GB_LOOPBACK_TYPE_PING:
@ -387,13 +385,6 @@ static u64 gb_loopback_calc_latency(struct timeval *ts, struct timeval *te)
return __gb_loopback_calc_latency(t1, t2);
}
static void gb_loopback_push_latency_ts(struct gb_loopback *gb,
struct timeval *ts, struct timeval *te)
{
kfifo_in(&gb->kfifo_ts, (unsigned char *)ts, sizeof(*ts));
kfifo_in(&gb->kfifo_ts, (unsigned char *)te, sizeof(*te));
}
static int gb_loopback_operation_sync(struct gb_loopback *gb, int type,
void *request, int request_size,
void *response, int response_size)
@ -433,7 +424,6 @@ static int gb_loopback_operation_sync(struct gb_loopback *gb, int type,
do_gettimeofday(&te);
/* Calculate the total time the message took */
gb_loopback_push_latency_ts(gb, &ts, &te);
gb->elapsed_nsecs = gb_loopback_calc_latency(&ts, &te);
out_put_operation:
@ -521,11 +511,9 @@ static void gb_loopback_async_operation_callback(struct gb_operation *operation)
err = true;
}
if (!err) {
gb_loopback_push_latency_ts(gb, &op_async->ts, &te);
if (!err)
gb->elapsed_nsecs = gb_loopback_calc_latency(&op_async->ts,
&te);
}
if (op_async->pending) {
if (err)
@ -1241,18 +1229,12 @@ static int gb_loopback_probe(struct gb_bundle *bundle,
retval = -ENOMEM;
goto out_conn;
}
if (kfifo_alloc(&gb->kfifo_ts, kfifo_depth * sizeof(struct timeval) * 2,
GFP_KERNEL)) {
retval = -ENOMEM;
goto out_kfifo0;
}
/* Fork worker thread */
mutex_init(&gb->mutex);
gb->task = kthread_run(gb_loopback_fn, gb, "gb_loopback");
if (IS_ERR(gb->task)) {
retval = PTR_ERR(gb->task);
goto out_kfifo1;
goto out_kfifo;
}
spin_lock_irqsave(&gb_dev.lock, flags);
@ -1266,9 +1248,7 @@ static int gb_loopback_probe(struct gb_bundle *bundle,
return 0;
out_kfifo1:
kfifo_free(&gb->kfifo_ts);
out_kfifo0:
out_kfifo:
kfifo_free(&gb->kfifo_lat);
out_conn:
device_unregister(dev);
@ -1302,7 +1282,6 @@ static void gb_loopback_disconnect(struct gb_bundle *bundle)
kthread_stop(gb->task);
kfifo_free(&gb->kfifo_lat);
kfifo_free(&gb->kfifo_ts);
gb_connection_latency_tag_disable(gb->connection);
debugfs_remove(gb->file);