[alsa-devel] [PATCH] ASoC: intel: Replace kthread with work
Takashi Iwai
tiwai at suse.de
Mon Nov 28 16:32:19 CET 2016
The usage pattern of kthread worker in Intel SST drivers can be
replaced gracefully with the normal workqueue, which is more light-
weight and easier to manage in general. Let's do it.
While in the replacement, move the schedule_work() call inside the
spinlock for excluding the race, too.
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
Vinod, I tested this only lightly, so it'd be helpful if the patch is
checked on the affected devices before merging.
sound/soc/intel/baytrail/sst-baytrail-ipc.c | 3 +-
sound/soc/intel/common/sst-ipc.c | 58 ++++++++++-------------------
sound/soc/intel/common/sst-ipc.h | 4 +-
sound/soc/intel/haswell/sst-haswell-ipc.c | 3 +-
sound/soc/intel/skylake/skl-sst-cldma.c | 1 -
sound/soc/intel/skylake/skl-sst-ipc.c | 2 +-
sound/soc/intel/skylake/skl-sst-ipc.h | 1 -
7 files changed, 24 insertions(+), 48 deletions(-)
diff --git a/sound/soc/intel/baytrail/sst-baytrail-ipc.c b/sound/soc/intel/baytrail/sst-baytrail-ipc.c
index 7ab14ce65a73..260447da32b8 100644
--- a/sound/soc/intel/baytrail/sst-baytrail-ipc.c
+++ b/sound/soc/intel/baytrail/sst-baytrail-ipc.c
@@ -23,7 +23,6 @@
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
-#include <linux/kthread.h>
#include <linux/firmware.h>
#include <linux/io.h>
#include <asm/div64.h>
@@ -338,7 +337,7 @@ static irqreturn_t sst_byt_irq_thread(int irq, void *context)
spin_unlock_irqrestore(&sst->spinlock, flags);
/* continue to send any remaining messages... */
- kthread_queue_work(&ipc->kworker, &ipc->kwork);
+ schedule_work(&ipc->kwork);
return IRQ_HANDLED;
}
diff --git a/sound/soc/intel/common/sst-ipc.c b/sound/soc/intel/common/sst-ipc.c
index 6c672ac79cce..d20356255d0c 100644
--- a/sound/soc/intel/common/sst-ipc.c
+++ b/sound/soc/intel/common/sst-ipc.c
@@ -26,7 +26,6 @@
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
-#include <linux/kthread.h>
#include <sound/asound.h>
#include "sst-dsp.h"
@@ -109,10 +108,9 @@ static int ipc_tx_message(struct sst_generic_ipc *ipc, u64 header,
ipc->ops.tx_data_copy(msg, tx_data, tx_bytes);
list_add_tail(&msg->list, &ipc->tx_list);
+ schedule_work(&ipc->kwork);
spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
- kthread_queue_work(&ipc->kworker, &ipc->kwork);
-
if (wait)
return tx_wait_done(ipc, msg, rx_data);
else
@@ -156,35 +154,32 @@ static int msg_empty_list_init(struct sst_generic_ipc *ipc)
return -ENOMEM;
}
-static void ipc_tx_msgs(struct kthread_work *work)
+static void ipc_tx_msgs(struct work_struct *work)
{
struct sst_generic_ipc *ipc =
container_of(work, struct sst_generic_ipc, kwork);
struct ipc_message *msg;
- unsigned long flags;
- spin_lock_irqsave(&ipc->dsp->spinlock, flags);
+ spin_lock_irq(&ipc->dsp->spinlock);
- if (list_empty(&ipc->tx_list) || ipc->pending) {
- spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
- return;
- }
-
- /* if the DSP is busy, we will TX messages after IRQ.
- * also postpone if we are in the middle of procesing completion irq*/
- if (ipc->ops.is_dsp_busy && ipc->ops.is_dsp_busy(ipc->dsp)) {
- dev_dbg(ipc->dev, "ipc_tx_msgs dsp busy\n");
- spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
- return;
- }
+ while (!list_empty(&ipc->tx_list) && !ipc->pending) {
+ /* if the DSP is busy, we will TX messages after IRQ.
+ * also postpone if we are in the middle of processing
+ * completion irq
+ */
+ if (ipc->ops.is_dsp_busy && ipc->ops.is_dsp_busy(ipc->dsp)) {
+ dev_dbg(ipc->dev, "ipc_tx_msgs dsp busy\n");
+ break;
+ }
- msg = list_first_entry(&ipc->tx_list, struct ipc_message, list);
- list_move(&msg->list, &ipc->rx_list);
+ msg = list_first_entry(&ipc->tx_list, struct ipc_message, list);
+ list_move(&msg->list, &ipc->rx_list);
- if (ipc->ops.tx_msg != NULL)
- ipc->ops.tx_msg(ipc, msg);
+ if (ipc->ops.tx_msg != NULL)
+ ipc->ops.tx_msg(ipc, msg);
+ }
- spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+ spin_unlock_irq(&ipc->dsp->spinlock);
}
int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc, u64 header,
@@ -280,19 +275,7 @@ int sst_ipc_init(struct sst_generic_ipc *ipc)
if (ret < 0)
return -ENOMEM;
- /* start the IPC message thread */
- kthread_init_worker(&ipc->kworker);
- ipc->tx_thread = kthread_run(kthread_worker_fn,
- &ipc->kworker, "%s",
- dev_name(ipc->dev));
- if (IS_ERR(ipc->tx_thread)) {
- dev_err(ipc->dev, "error: failed to create message TX task\n");
- ret = PTR_ERR(ipc->tx_thread);
- kfree(ipc->msg);
- return ret;
- }
-
- kthread_init_work(&ipc->kwork, ipc_tx_msgs);
+ INIT_WORK(&ipc->kwork, ipc_tx_msgs);
return 0;
}
EXPORT_SYMBOL_GPL(sst_ipc_init);
@@ -301,8 +284,7 @@ void sst_ipc_fini(struct sst_generic_ipc *ipc)
{
int i;
- if (ipc->tx_thread)
- kthread_stop(ipc->tx_thread);
+ cancel_work_sync(&ipc->kwork);
if (ipc->msg) {
for (i = 0; i < IPC_EMPTY_LIST_SIZE; i++) {
diff --git a/sound/soc/intel/common/sst-ipc.h b/sound/soc/intel/common/sst-ipc.h
index ceb7e468a3fa..ea79cff5c6cc 100644
--- a/sound/soc/intel/common/sst-ipc.h
+++ b/sound/soc/intel/common/sst-ipc.h
@@ -23,7 +23,6 @@
#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
-#include <linux/kthread.h>
#define IPC_MAX_MAILBOX_BYTES 256
@@ -65,8 +64,7 @@ struct sst_generic_ipc {
struct list_head empty_list;
wait_queue_head_t wait_txq;
struct task_struct *tx_thread;
- struct kthread_worker kworker;
- struct kthread_work kwork;
+ struct work_struct kwork;
bool pending;
struct ipc_message *msg;
int tx_data_max_size;
diff --git a/sound/soc/intel/haswell/sst-haswell-ipc.c b/sound/soc/intel/haswell/sst-haswell-ipc.c
index e432a31fd9f2..a3459d1682a6 100644
--- a/sound/soc/intel/haswell/sst-haswell-ipc.c
+++ b/sound/soc/intel/haswell/sst-haswell-ipc.c
@@ -26,7 +26,6 @@
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
-#include <linux/kthread.h>
#include <linux/firmware.h>
#include <linux/dma-mapping.h>
#include <linux/debugfs.h>
@@ -818,7 +817,7 @@ static irqreturn_t hsw_irq_thread(int irq, void *context)
spin_unlock_irqrestore(&sst->spinlock, flags);
/* continue to send any remaining messages... */
- kthread_queue_work(&ipc->kworker, &ipc->kwork);
+ schedule_work(&ipc->kwork);
return IRQ_HANDLED;
}
diff --git a/sound/soc/intel/skylake/skl-sst-cldma.c b/sound/soc/intel/skylake/skl-sst-cldma.c
index efa2532114ba..c9f6d87381db 100644
--- a/sound/soc/intel/skylake/skl-sst-cldma.c
+++ b/sound/soc/intel/skylake/skl-sst-cldma.c
@@ -17,7 +17,6 @@
#include <linux/device.h>
#include <linux/mm.h>
-#include <linux/kthread.h>
#include <linux/delay.h>
#include "../common/sst-dsp.h"
#include "../common/sst-dsp-priv.h"
diff --git a/sound/soc/intel/skylake/skl-sst-ipc.c b/sound/soc/intel/skylake/skl-sst-ipc.c
index 797cf4053235..499c0b15e5d0 100644
--- a/sound/soc/intel/skylake/skl-sst-ipc.c
+++ b/sound/soc/intel/skylake/skl-sst-ipc.c
@@ -464,7 +464,7 @@ irqreturn_t skl_dsp_irq_thread_handler(int irq, void *context)
skl_ipc_int_enable(dsp);
/* continue to send any remaining messages... */
- kthread_queue_work(&ipc->kworker, &ipc->kwork);
+ schedule_work(&ipc->kwork);
return IRQ_HANDLED;
}
diff --git a/sound/soc/intel/skylake/skl-sst-ipc.h b/sound/soc/intel/skylake/skl-sst-ipc.h
index 0334ed4af031..5c37442a6db4 100644
--- a/sound/soc/intel/skylake/skl-sst-ipc.h
+++ b/sound/soc/intel/skylake/skl-sst-ipc.h
@@ -16,7 +16,6 @@
#ifndef __SKL_IPC_H
#define __SKL_IPC_H
-#include <linux/kthread.h>
#include <linux/irqreturn.h>
#include "../common/sst-ipc.h"
--
2.10.2
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