linux-kernel - [PATCH v2] drm/vmgfx: Use non-hybrid PCI devres API

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20250423120643.66814-2-phasta@kernel.org>
Date: Wed, 23 Apr 2025 14:06:44 +0200
From: Philipp Stanner <phasta@...nel.org>
To: Zack Rusin <zack.rusin@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Philipp Stanner <phasta@...nel.org>
Subject: [PATCH v2] drm/vmgfx: Use non-hybrid PCI devres API

vmgfx enables its PCI device with pcim_enable_device(). This,
implicitly, switches the function pci_request_regions() into managed
mode, where it becomes a devres function.

The PCI subsystem wants to remove this hybrid nature from its
interfaces. To do so, users of the aforementioned combination of
functions must be ported to non-hybrid functions.

Moreover, since both functions are already managed in this driver, the
calls to pci_release_regions() are unnecessary.

Remove the calls to pci_release_regions().

Replace the call to sometimes-managed pci_request_regions() with one to
the always-managed pcim_request_all_regions().

Signed-off-by: Philipp Stanner <phasta@...nel.org>
---
Changes in v2:
  - Fix unused variable error.
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 0f32471c8533..1e3ebace32ae 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -733,7 +733,7 @@ static int vmw_setup_pci_resources(struct vmw_private *dev,
 
 	pci_set_master(pdev);
 
-	ret = pci_request_regions(pdev, "vmwgfx probe");
+	ret = pcim_request_all_regions(pdev, "vmwgfx probe");
 	if (ret)
 		return ret;
 
@@ -753,7 +753,6 @@ static int vmw_setup_pci_resources(struct vmw_private *dev,
 		if (!dev->rmmio) {
 			drm_err(&dev->drm,
 				"Failed mapping registers mmio memory.\n");
-			pci_release_regions(pdev);
 			return -ENOMEM;
 		}
 	} else if (pci_id == VMWGFX_PCI_ID_SVGA2) {
@@ -774,11 +773,9 @@ static int vmw_setup_pci_resources(struct vmw_private *dev,
 		if (IS_ERR(dev->fifo_mem)) {
 			drm_err(&dev->drm,
 				  "Failed mapping FIFO memory.\n");
-			pci_release_regions(pdev);
 			return PTR_ERR(dev->fifo_mem);
 		}
 	} else {
-		pci_release_regions(pdev);
 		return -EINVAL;
 	}
 
@@ -856,7 +853,6 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
 	int ret;
 	enum vmw_res_type i;
 	bool refuse_dma = false;
-	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 
 	vmw_sw_context_init(dev_priv);
 
@@ -872,7 +868,7 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
 		return ret;
 	ret = vmw_detect_version(dev_priv);
 	if (ret)
-		goto out_no_pci_or_version;
+		return ret;
 
 
 	for (i = vmw_res_context; i < vmw_res_max; ++i) {
@@ -1172,15 +1168,13 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
 
 	if (dev_priv->ctx.staged_bindings)
 		vmw_binding_state_free(dev_priv->ctx.staged_bindings);
-out_no_pci_or_version:
-	pci_release_regions(pdev);
+
 	return ret;
 }
 
 static void vmw_driver_unload(struct drm_device *dev)
 {
 	struct vmw_private *dev_priv = vmw_priv(dev);
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	enum vmw_res_type i;
 
 	unregister_pm_notifier(&dev_priv->pm_nb);
@@ -1216,8 +1210,6 @@ static void vmw_driver_unload(struct drm_device *dev)
 		idr_destroy(&dev_priv->res_idr[i]);
 
 	vmw_mksstat_remove_all(dev_priv);
-
-	pci_release_regions(pdev);
 }
 
 static void vmw_postclose(struct drm_device *dev,
-- 
2.48.1