[PATCH] crypto: omap - convert from tasklet to BH workqueue

[PATCH] crypto: omap - convert from tasklet to BH workqueue

[Ryo Takakura]

tasklet has been marked deprecated and it's planned to be
removed. Make omap crypto drivers to use BH workqueue which
is the new interface for executing in BH context in place
of tasklet.

Signed-off-by: Ryo Takakura <ryotkkr98@gmail.com>
---

Hi!

The background on tasklet -> BH workqueue conversion can be found here[0].
system_bh_wq is used as suggested.

Sincerely,
Ryo Takakura

[0] https://lore.kernel.org/all/20240130091300.2968534-1-tj@kernel.org/

---
 drivers/crypto/omap-aes.c  | 15 ++++++++-------
 drivers/crypto/omap-aes.h  |  2 +-
 drivers/crypto/omap-des.c  | 17 +++++++++--------
 drivers/crypto/omap-sham.c | 15 ++++++++-------
 4 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index 244e24e52..3cc802622 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -32,6 +32,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/scatterlist.h>
 #include <linux/string.h>
+#include <linux/workqueue.h>
 
 #include "omap-crypto.h"
 #include "omap-aes.h"
@@ -221,7 +222,7 @@ static void omap_aes_dma_out_callback(void *data)
 	struct omap_aes_dev *dd = data;
 
 	/* dma_lch_out - completed */
-	tasklet_schedule(&dd->done_task);
+	queue_work(system_bh_wq, &dd->done_task);
 }
 
 static int omap_aes_dma_init(struct omap_aes_dev *dd)
@@ -494,9 +495,9 @@ static void omap_aes_copy_ivout(struct omap_aes_dev *dd, u8 *ivbuf)
 		((u32 *)ivbuf)[i] = omap_aes_read(dd, AES_REG_IV(dd, i));
 }
 
-static void omap_aes_done_task(unsigned long data)
+static void omap_aes_done_task(struct work_struct *t)
 {
-	struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
+	struct omap_aes_dev *dd = from_work(dd, t, done_task);
 
 	pr_debug("enter done_task\n");
 
@@ -925,7 +926,7 @@ static irqreturn_t omap_aes_irq(int irq, void *dev_id)
 
 		if (!dd->total)
 			/* All bytes read! */
-			tasklet_schedule(&dd->done_task);
+			queue_work(system_bh_wq, &dd->done_task);
 		else
 			/* Enable DATA_IN interrupt for next block */
 			omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
@@ -1140,7 +1141,7 @@ static int omap_aes_probe(struct platform_device *pdev)
 		 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
 		 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
 
-	tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
+	INIT_WORK(&dd->done_task, omap_aes_done_task);
 
 	err = omap_aes_dma_init(dd);
 	if (err == -EPROBE_DEFER) {
@@ -1229,7 +1230,7 @@ static int omap_aes_probe(struct platform_device *pdev)
 
 	omap_aes_dma_cleanup(dd);
 err_irq:
-	tasklet_kill(&dd->done_task);
+	cancel_work_sync(&dd->done_task);
 err_pm_disable:
 	pm_runtime_disable(dev);
 err_res:
@@ -1264,7 +1265,7 @@ static void omap_aes_remove(struct platform_device *pdev)
 
 	crypto_engine_exit(dd->engine);
 
-	tasklet_kill(&dd->done_task);
+	cancel_work_sync(&dd->done_task);
 	omap_aes_dma_cleanup(dd);
 	pm_runtime_disable(dd->dev);
 }
diff --git a/drivers/crypto/omap-aes.h b/drivers/crypto/omap-aes.h
index 41d67780f..99c36a777 100644
--- a/drivers/crypto/omap-aes.h
+++ b/drivers/crypto/omap-aes.h
@@ -159,7 +159,7 @@ struct omap_aes_dev {
 	unsigned long		flags;
 	int			err;
 
-	struct tasklet_struct	done_task;
+	struct work_struct	done_task;
 	struct aead_queue	aead_queue;
 	spinlock_t		lock;
 
diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index 9c5538ae1..149ebd777 100644
--- a/drivers/crypto/omap-des.c
+++ b/drivers/crypto/omap-des.c
@@ -32,6 +32,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/scatterlist.h>
 #include <linux/string.h>
+#include <linux/workqueue.h>
 
 #include "omap-crypto.h"
 
@@ -130,7 +131,7 @@ struct omap_des_dev {
 	unsigned long		flags;
 	int			err;
 
-	struct tasklet_struct	done_task;
+	struct work_struct	done_task;
 
 	struct skcipher_request	*req;
 	struct crypto_engine		*engine;
@@ -325,7 +326,7 @@ static void omap_des_dma_out_callback(void *data)
 	struct omap_des_dev *dd = data;
 
 	/* dma_lch_out - completed */
-	tasklet_schedule(&dd->done_task);
+	queue_work(system_bh_wq, &dd->done_task);
 }
 
 static int omap_des_dma_init(struct omap_des_dev *dd)
@@ -580,9 +581,9 @@ static int omap_des_crypt_req(struct crypto_engine *engine,
 	       omap_des_crypt_dma_start(dd);
 }
 
-static void omap_des_done_task(unsigned long data)
+static void omap_des_done_task(struct work_struct *t)
 {
-	struct omap_des_dev *dd = (struct omap_des_dev *)data;
+	struct omap_des_dev *dd = from_work(dd, t, done_task);
 	int i;
 
 	pr_debug("enter done_task\n");
@@ -890,7 +891,7 @@ static irqreturn_t omap_des_irq(int irq, void *dev_id)
 
 		if (!dd->total)
 			/* All bytes read! */
-			tasklet_schedule(&dd->done_task);
+			queue_work(system_bh_wq, &dd->done_task);
 		else
 			/* Enable DATA_IN interrupt for next block */
 			omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
@@ -986,7 +987,7 @@ static int omap_des_probe(struct platform_device *pdev)
 		 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
 		 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
 
-	tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
+	INIT_WORK(&dd->done_task, omap_des_done_task);
 
 	err = omap_des_dma_init(dd);
 	if (err == -EPROBE_DEFER) {
@@ -1053,7 +1054,7 @@ static int omap_des_probe(struct platform_device *pdev)
 
 	omap_des_dma_cleanup(dd);
 err_irq:
-	tasklet_kill(&dd->done_task);
+	cancel_work_sync(&dd->done_task);
 err_get:
 	pm_runtime_disable(dev);
 err_res:
@@ -1077,7 +1078,7 @@ static void omap_des_remove(struct platform_device *pdev)
 			crypto_engine_unregister_skcipher(
 					&dd->pdata->algs_info[i].algs_list[j]);
 
-	tasklet_kill(&dd->done_task);
+	cancel_work_sync(&dd->done_task);
 	omap_des_dma_cleanup(dd);
 	pm_runtime_disable(dd->dev);
 }
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 6328e8026..ff8aac029 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -37,6 +37,7 @@
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/workqueue.h>
 
 #define MD5_DIGEST_SIZE			16
 
@@ -217,7 +218,7 @@ struct omap_sham_dev {
 	int			irq;
 	int			err;
 	struct dma_chan		*dma_lch;
-	struct tasklet_struct	done_task;
+	struct work_struct	done_task;
 	u8			polling_mode;
 	u8			xmit_buf[BUFLEN] OMAP_ALIGNED;
 
@@ -561,7 +562,7 @@ static void omap_sham_dma_callback(void *param)
 	struct omap_sham_dev *dd = param;
 
 	set_bit(FLAGS_DMA_READY, &dd->flags);
-	tasklet_schedule(&dd->done_task);
+	queue_work(system_bh_wq, &dd->done_task);
 }
 
 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, size_t length,
@@ -1703,9 +1704,9 @@ static struct ahash_engine_alg algs_sha384_sha512[] = {
 },
 };
 
-static void omap_sham_done_task(unsigned long data)
+static void omap_sham_done_task(struct work_struct *t)
 {
-	struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
+	struct omap_sham_dev *dd = from_work(dd, t, done_task);
 	int err = 0;
 
 	dev_dbg(dd->dev, "%s: flags=%lx\n", __func__, dd->flags);
@@ -1739,7 +1740,7 @@ static void omap_sham_done_task(unsigned long data)
 static irqreturn_t omap_sham_irq_common(struct omap_sham_dev *dd)
 {
 	set_bit(FLAGS_OUTPUT_READY, &dd->flags);
-	tasklet_schedule(&dd->done_task);
+	queue_work(system_bh_wq, &dd->done_task);
 
 	return IRQ_HANDLED;
 }
@@ -2059,7 +2060,7 @@ static int omap_sham_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, dd);
 
 	INIT_LIST_HEAD(&dd->list);
-	tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
+	INIT_WORK(&dd->done_task, omap_sham_done_task);
 	crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
 
 	err = (dev->of_node) ? omap_sham_get_res_of(dd, dev, &res) :
@@ -2194,7 +2195,7 @@ static void omap_sham_remove(struct platform_device *pdev)
 					&dd->pdata->algs_info[i].algs_list[j]);
 			dd->pdata->algs_info[i].registered--;
 		}
-	tasklet_kill(&dd->done_task);
+	cancel_work_sync(&dd->done_task);
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 
-- 
2.47.1

Re: [PATCH] crypto: omap - convert from tasklet to BH workqueue

[Tejun Heo]

On Sat, Sep 06, 2025 at 11:41:35AM +0000, Ryo Takakura wrote:
> tasklet has been marked deprecated and it's planned to be
> removed. Make omap crypto drivers to use BH workqueue which
> is the new interface for executing in BH context in place
> of tasklet.
> 
> Signed-off-by: Ryo Takakura <ryotkkr98@gmail.com>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun

Re: [PATCH] crypto: omap - convert from tasklet to BH workqueue

[Herbert Xu]

On Sat, Sep 06, 2025 at 11:41:35AM +0000, Ryo Takakura wrote:
> tasklet has been marked deprecated and it's planned to be
> removed. Make omap crypto drivers to use BH workqueue which
> is the new interface for executing in BH context in place
> of tasklet.
> 
> Signed-off-by: Ryo Takakura <ryotkkr98@gmail.com>
> ---
> 
> Hi!
> 
> The background on tasklet -> BH workqueue conversion can be found here[0].
> system_bh_wq is used as suggested.
> 
> Sincerely,
> Ryo Takakura
> 
> [0] https://lore.kernel.org/all/20240130091300.2968534-1-tj@kernel.org/
> 
> ---
>  drivers/crypto/omap-aes.c  | 15 ++++++++-------
>  drivers/crypto/omap-aes.h  |  2 +-
>  drivers/crypto/omap-des.c  | 17 +++++++++--------
>  drivers/crypto/omap-sham.c | 15 ++++++++-------
>  4 files changed, 26 insertions(+), 23 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt