[media] v4l/cx18: update workqueue usage

With cmwq, there's no reason to use separate out_work_queue.  Drop it
and use system_wq instead.  The in_work_queue needs to be ordered so
can't use one of the system wqs; however, as it isn't used to reclaim
memory, allocate the workqueue with alloc_ordered_workqueue() without
WQ_MEM_RECLAIM.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andy Walls <awalls@md.metrocast.net>
Acked-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 3 insertions, 27 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.c b/drivers/media/video/cx18/cx18-driver.c
index 133ec2bac180..944af8adbe0c 100644
--- a/drivers/media/video/cx18/cx18-driver.c
+++ b/drivers/media/video/cx18/cx18-driver.c
@@ -664,7 +664,7 @@ static int __devinit cx18_create_in_workq(struct cx18 *cx)
 {
         snprintf(cx->in_workq_name, sizeof(cx->in_workq_name), "%s-in",
                  cx->v4l2_dev.name);
-        cx->in_work_queue = create_singlethread_workqueue(cx->in_workq_name);
+        cx->in_work_queue = alloc_ordered_workqueue(cx->in_workq_name, 0);
         if (cx->in_work_queue == NULL) {
                 CX18_ERR("Unable to create incoming mailbox handler thread\n");
                 return -ENOMEM;
@@ -672,18 +672,6 @@ static int __devinit cx18_create_in_workq(struct cx18 *cx)
         return 0;
 }
 
-static int __devinit cx18_create_out_workq(struct cx18 *cx)
-{
-        snprintf(cx->out_workq_name, sizeof(cx->out_workq_name), "%s-out",
-                 cx->v4l2_dev.name);
-        cx->out_work_queue = create_workqueue(cx->out_workq_name);
-        if (cx->out_work_queue == NULL) {
-                CX18_ERR("Unable to create outgoing mailbox handler threads\n");
-                return -ENOMEM;
-        }
-        return 0;
-}
-
 static void __devinit cx18_init_in_work_orders(struct cx18 *cx)
 {
         int i;
@@ -710,15 +698,9 @@ static int __devinit cx18_init_struct1(struct cx18 *cx)
         mutex_init(&cx->epu2apu_mb_lock);
         mutex_init(&cx->epu2cpu_mb_lock);
 
-        ret = cx18_create_out_workq(cx);
-        if (ret)
-                return ret;
-
         ret = cx18_create_in_workq(cx);
-        if (ret) {
-                destroy_workqueue(cx->out_work_queue);
+        if (ret)
                 return ret;
-        }
 
         cx18_init_in_work_orders(cx);
 
@@ -1107,7 +1089,6 @@ free_mem:
         release_mem_region(cx->base_addr, CX18_MEM_SIZE);
 free_workqueues:
         destroy_workqueue(cx->in_work_queue);
-        destroy_workqueue(cx->out_work_queue);
 err:
         if (retval == 0)
                 retval = -ENODEV;
@@ -1259,7 +1240,6 @@ static void cx18_remove(struct pci_dev *pci_dev)
         cx18_halt_firmware(cx);
 
         destroy_workqueue(cx->in_work_queue);
-        destroy_workqueue(cx->out_work_queue);
 
         cx18_streams_cleanup(cx, 1);
 
diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index f6f3e50d4bdf..306caac6d3fc 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -617,9 +617,6 @@ struct cx18 {
         struct cx18_in_work_order in_work_order[CX18_MAX_IN_WORK_ORDERS];
         char epu_debug_str[256]; /* CX18_EPU_DEBUG is rare: use shared space */
 
-        struct workqueue_struct *out_work_queue;
-        char out_workq_name[12]; /* "cx18-NN-out" */
-
         /* i2c */
         struct i2c_adapter i2c_adap[2];
         struct i2c_algo_bit_data i2c_algo[2];
diff --git a/drivers/media/video/cx18/cx18-streams.h b/drivers/media/video/cx18/cx18-streams.h
index 51765eb12d39..713b0e61536d 100644
--- a/drivers/media/video/cx18/cx18-streams.h
+++ b/drivers/media/video/cx18/cx18-streams.h
@@ -42,8 +42,7 @@ static inline bool cx18_stream_enabled(struct cx18_stream *s)
 /* Related to submission of mdls to firmware */
 static inline void cx18_stream_load_fw_queue(struct cx18_stream *s)
 {
-        struct cx18 *cx = s->cx;
-        queue_work(cx->out_work_queue, &s->out_work_order);
+        schedule_work(&s->out_work_order);
 }
 
 static inline void cx18_stream_put_mdl_fw(struct cx18_stream *s,