| Message ID | 20160702085054.GA28059@Karyakshetra (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Sat, Jul 02, 2016 at 02:20:55PM +0530, Bhaktipriya Shridhar wrote: > 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> Thanks.
diff --git a/drivers/spi/spi-txx9.c b/drivers/spi/spi-txx9.c index d69f8f8..7492ea3 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; }
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> --- drivers/spi/spi-txx9.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html