linux-kernel - [PATCH 09/10] pci: devres: remove legacy pcim

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Message-ID: <20240115144655.32046-11-pstanner@redhat.com>
Date: Mon, 15 Jan 2024 15:46:20 +0100
From: Philipp Stanner <pstanner@...hat.com>
To: Jonathan Corbet <corbet@....net>,
	Hans de Goede <hdegoede@...hat.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Philipp Stanner <pstanner@...hat.com>,
	Sam Ravnborg <sam@...nborg.org>,
	dakr@...hat.com
Cc: linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-pci@...r.kernel.org
Subject: [PATCH 09/10] pci: devres: remove legacy pcim_release()

Thanks to preceding cleanup steps, pcim_release() is now not needed
anymore and can be replaced by pcim_disable_device(), which is the exact
counterpart to pcim_enable_device().
This permits removing further parts of the old devres API.

Replace pcim_release() with pcim_disable_device().
Remove the now surplus get_dr() function.

Signed-off-by: Philipp Stanner <pstanner@...hat.com>
---
 drivers/pci/devres.c | 38 ++++++++------------------------------
 1 file changed, 8 insertions(+), 30 deletions(-)

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index 7c4edcaeb8fe..87bc62be21eb 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -464,48 +464,26 @@ int pcim_intx(struct pci_dev *pdev, int enable)
 }
 EXPORT_SYMBOL_GPL(pcim_intx);
 
-static void pcim_release(struct device *gendev, void *res)
+static void pcim_disable_device(void *pdev_raw)
 {
-	struct pci_dev *dev = to_pci_dev(gendev);
-
-	if (!dev->pinned)
-		pci_disable_device(dev);
-}
-
-static struct pci_devres *get_pci_dr(struct pci_dev *pdev)
-{
-	struct pci_devres *dr, *new_dr;
-
-	dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
-	if (dr)
-		return dr;
+	struct pci_dev *pdev = pdev_raw;
 
-	new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
-	if (!new_dr)
-		return NULL;
-	return devres_get(&pdev->dev, new_dr, NULL, NULL);
+	if (!pdev->pinned)
+		pci_disable_device(pdev);
 }
 
 /**
  * pcim_enable_device - Managed pci_enable_device()
  * @pdev: PCI device to be initialized
  *
- * Managed pci_enable_device().
+ * Managed pci_enable_device(). Device will automatically be disabled on
+ * driver detach.
  */
 int pcim_enable_device(struct pci_dev *pdev)
 {
-	struct pci_devres *dr;
-	int rc;
-
-	dr = get_pci_dr(pdev);
-	if (unlikely(!dr))
-		return -ENOMEM;
-
-	rc = pci_enable_device(pdev);
-	if (!rc)
-		pdev->is_managed = 1;
+	devm_add_action(&pdev->dev, pcim_disable_device, pdev);
 
-	return rc;
+	return pci_enable_device(pdev);
 }
 EXPORT_SYMBOL(pcim_enable_device);
 
-- 
2.43.0