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authorBhaktipriya Shridhar <bhaktipriya96@gmail.com>2016-07-02 14:20:55 +0530
committerMark Brown <broonie@kernel.org>2016-07-03 14:22:27 +0200
commitb43afff7dc3719612dd5140fe2b0357ae1faf9b7 (patch)
tree5f5f787242c21a001c71a32b6f18fe73b684792e /drivers/spi/spi-txx9.c
parent1a695a905c18548062509178b98bc91e67510864 (diff)
spi: spi-txx9: Remove deprecated create_singlethread_workqueue
The workqueue "workqueue" has a single work item(&c->work) and hence doesn't require ordering. Also, it is not being used on a memory reclaim path. Hence, the singlethreaded workqueue has been replaced with the use of system_wq. System workqueues have been able to handle high level of concurrency for a long time now and hence it's not required to have a singlethreaded workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue created with create_singlethread_workqueue(), system_wq allows multiple work items to overlap executions even on the same CPU; however, a per-cpu workqueue doesn't have any CPU locality or global ordering guarantee unless the target CPU is explicitly specified and thus the increase of local concurrency shouldn't make any difference. Work item has been flushed in txx9spi_remove() to ensure that nothing is pending while disconnecting the driver. Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-txx9.c')
-rw-r--r--drivers/spi/spi-txx9.c11
1 files changed, 2 insertions, 9 deletions
diff --git a/drivers/spi/spi-txx9.c b/drivers/spi/spi-txx9.c
index d69f8f8f3fa6..7492ea346b43 100644
--- a/drivers/spi/spi-txx9.c
+++ b/drivers/spi/spi-txx9.c
@@ -72,7 +72,6 @@
struct txx9spi {
- struct workqueue_struct *workqueue;
struct work_struct work;
spinlock_t lock; /* protect 'queue' */
struct list_head queue;
@@ -315,7 +314,7 @@ static int txx9spi_transfer(struct spi_device *spi, struct spi_message *m)
spin_lock_irqsave(&c->lock, flags);
list_add_tail(&m->queue, &c->queue);
- queue_work(c->workqueue, &c->work);
+ schedule_work(&c->work);
spin_unlock_irqrestore(&c->lock, flags);
return 0;
@@ -374,10 +373,6 @@ static int txx9spi_probe(struct platform_device *dev)
if (ret)
goto exit;
- c->workqueue = create_singlethread_workqueue(
- dev_name(master->dev.parent));
- if (!c->workqueue)
- goto exit_busy;
c->last_chipselect = -1;
dev_info(&dev->dev, "at %#llx, irq %d, %dMHz\n",
@@ -400,8 +395,6 @@ static int txx9spi_probe(struct platform_device *dev)
exit_busy:
ret = -EBUSY;
exit:
- if (c->workqueue)
- destroy_workqueue(c->workqueue);
clk_disable(c->clk);
spi_master_put(master);
return ret;
@@ -412,7 +405,7 @@ static int txx9spi_remove(struct platform_device *dev)
struct spi_master *master = platform_get_drvdata(dev);
struct txx9spi *c = spi_master_get_devdata(master);
- destroy_workqueue(c->workqueue);
+ flush_work(&c->work);
clk_disable(c->clk);
return 0;
}

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