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Message-ID: <ad924306-d15c-9f1e-13dc-eaf674878022@I-love.SAKURA.ne.jp>
Date: Fri, 10 Jun 2022 13:48:12 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Matt Porter <mporter@...nel.crashing.org>,
Alexandre Bounine <alex.bou9@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] rapidio/tsi721: avoid flush_scheduled_work() usage
Use local wq in order to avoid flush_scheduled_work() usage.
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
Please see commit c4f135d643823a86 ("workqueue: Wrap flush_workqueue()
using a macro") for background.
Is allocating one workqueue for each "struct tsi721_device" too much,
given that "struct tsi721_device" has only pw_work and idb_work? If yes,
we could use module_init()/module_exit() for creating/destroying per a
module workqueue.
drivers/rapidio/devices/tsi721.c | 19 ++++++++++++++-----
drivers/rapidio/devices/tsi721.h | 3 +++
2 files changed, 17 insertions(+), 5 deletions(-)
diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index b3134744fb55..a2e4969e2122 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -282,7 +282,7 @@ tsi721_pw_handler(struct tsi721_device *priv)
iowrite32(TSI721_RIO_PW_RX_STAT_PW_DISC | TSI721_RIO_PW_RX_STAT_PW_VAL,
priv->regs + TSI721_RIO_PW_RX_STAT);
- schedule_work(&priv->pw_work);
+ queue_work(priv->wq, &priv->pw_work);
return 0;
}
@@ -373,7 +373,7 @@ tsi721_dbell_handler(struct tsi721_device *priv)
iowrite32(regval,
priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
- schedule_work(&priv->idb_work);
+ queue_work(priv->wq, &priv->idb_work);
return 0;
}
@@ -443,7 +443,7 @@ static void tsi721_db_dpc(struct work_struct *work)
wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
if (wr_ptr != rd_ptr)
- schedule_work(&priv->idb_work);
+ queue_work(priv->wq, &priv->idb_work);
}
/**
@@ -2743,10 +2743,16 @@ static int tsi721_probe(struct pci_dev *pdev,
goto err_exit;
}
+ priv->wq = alloc_workqueue("tsi721_wq", 0, 0);
+ if (!priv->wq) {
+ err = -ENOMEM;
+ goto err_clean;
+ }
+
err = pci_enable_device(pdev);
if (err) {
tsi_err(&pdev->dev, "Failed to enable PCI device");
- goto err_clean;
+ goto err_free_wq;
}
priv->pdev = pdev;
@@ -2927,6 +2933,8 @@ static int tsi721_probe(struct pci_dev *pdev,
pci_clear_master(pdev);
err_disable_pdev:
pci_disable_device(pdev);
+err_free_wq:
+ destroy_workqueue(priv->wq);
err_clean:
kfree(priv);
err_exit:
@@ -2941,7 +2949,7 @@ static void tsi721_remove(struct pci_dev *pdev)
tsi721_disable_ints(priv);
tsi721_free_irq(priv);
- flush_scheduled_work();
+ flush_workqueue(priv->wq);
rio_unregister_mport(&priv->mport);
tsi721_unregister_dma(priv);
@@ -2964,6 +2972,7 @@ static void tsi721_remove(struct pci_dev *pdev)
pci_clear_master(pdev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
+ destroy_workqueue(priv->wq);
kfree(priv);
tsi_debug(EXIT, &pdev->dev, "exit");
}
diff --git a/drivers/rapidio/devices/tsi721.h b/drivers/rapidio/devices/tsi721.h
index 4f996ce62725..57a38d24ed8f 100644
--- a/drivers/rapidio/devices/tsi721.h
+++ b/drivers/rapidio/devices/tsi721.h
@@ -908,6 +908,9 @@ struct tsi721_device {
struct tsi721_obw_bar p2r_bar[2];
struct tsi721_ob_win ob_win[TSI721_OBWIN_NUM];
int obwin_cnt;
+
+ /* Workqueue for processing works in this struct. */
+ struct workqueue_struct *wq;
};
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
--
2.18.4
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