Re: [PATCH v2] dmaengine: idxd: Remove usage of the deprecated ida_simple_xx() API

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On 12/19/2023 1:33 PM, Christophe JAILLET wrote:
ida_alloc() and ida_free() should be preferred to the deprecated
ida_simple_get() and ida_simple_remove().

This is less verbose.

Note that the upper limit of ida_simple_get() is exclusive, but the one of
ida_alloc_range() is inclusive. Sothis change allows one more device. >
MINORMASK is ((1U << MINORBITS) - 1), so allowing MINORMASK as a maximum value
makes sense. It is also consistent with other "ida_.*MINORMASK" and
"ida_*MINOR()" usages.

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---

Acked-by: Lijun Pan <lijun.pan@xxxxxxxxx>


Changes v2:
   - remove note about compile tested only, now tested on hw by Fenghua Yu
   - fix some wording in the commit description   [Fenghua Yu]
v1: https://lore.kernel.org/all/a899125f42c12fa782a881d341d147519cbb4a23.1702967302.git.christophe.jaillet@xxxxxxxxxx/
---
  drivers/dma/idxd/cdev.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index 0423655f5a88..b00926abc69a 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -165,7 +165,7 @@ static void idxd_cdev_dev_release(struct device *dev)
  	struct idxd_wq *wq = idxd_cdev->wq;
cdev_ctx = &ictx[wq->idxd->data->type];
-	ida_simple_remove(&cdev_ctx->minor_ida, idxd_cdev->minor);
+	ida_free(&cdev_ctx->minor_ida, idxd_cdev->minor);
  	kfree(idxd_cdev);
  }
@@ -463,7 +463,7 @@ int idxd_wq_add_cdev(struct idxd_wq *wq)
  	cdev = &idxd_cdev->cdev;
  	dev = cdev_dev(idxd_cdev);
  	cdev_ctx = &ictx[wq->idxd->data->type];
-	minor = ida_simple_get(&cdev_ctx->minor_ida, 0, MINORMASK, GFP_KERNEL);
+	minor = ida_alloc_max(&cdev_ctx->minor_ida, MINORMASK, GFP_KERNEL);

It shouldn't be an issue though it should be below statement if directly converting to ida_alloc_max
+	minor = ida_alloc_max(&cdev_ctx->minor_ida, MINORMASK - 1, GFP_KERNEL);

  	if (minor < 0) {
  		kfree(idxd_cdev);
  		return minor;




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