Re: [PATCH] media: tw5864: Simplify 'tw5864_finidev()'

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Le 19/10/2021 à 12:35, Kieran Bingham a écrit :
Quoting Christophe JAILLET (2021-10-16 09:40:29)
Some resources are allocated with 'pci_request_regions()', so use
'pci_release_regions()' to free them, instead of a verbose
'release_mem_region()'.

And the driver was even already using pci_release_regions() in
tw5864_initdev(), so indeed this makes it more consistent too.

I'm curious that tw5864_initdev() calls pci_enable_device() (and
pci_disable_device in it's error path), while tw5864_finidev() doesn't.

I agree with you. I should have spotted it when I've looked at the probe and remove functions :(


Would you like to submit a patch to fix that on top of this one? or should I?

Either way is fine for me.
If it's fine for you to fix it, I leave it to you.

A more invasive fix could be to switch to 'pcim_enable_device()' and remove both 'pci_release_regions()' and 'pci_disable_device()' calls.

CJ


Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>

There is no point in calling 'devm_kfree()'. The corresponding resource is
managed, so it will be fried automatically.

Indeed.

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
  drivers/media/pci/tw5864/tw5864-core.c | 4 +---
  1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/media/pci/tw5864/tw5864-core.c b/drivers/media/pci/tw5864/tw5864-core.c
index 23d3cae54a5d..fee3b7711901 100644
--- a/drivers/media/pci/tw5864/tw5864-core.c
+++ b/drivers/media/pci/tw5864/tw5864-core.c
@@ -333,11 +333,9 @@ static void tw5864_finidev(struct pci_dev *pci_dev)
/* release resources */
         iounmap(dev->mmio);
-       release_mem_region(pci_resource_start(pci_dev, 0),
-                          pci_resource_len(pci_dev, 0));
+       pci_release_regions(pci_dev);
v4l2_device_unregister(&dev->v4l2_dev);
-       devm_kfree(&pci_dev->dev, dev);
  }
static struct pci_driver tw5864_pci_driver = {
--
2.30.2






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