linux-kernel - [PATCH 3/3] drm/amdgpu: wire up the can

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Date: Fri, 2 Feb 2024 17:25:56 -0500
From: Hamza Mahfooz <hamza.mahfooz@....com>
To: <linux-kernel@...r.kernel.org>
CC: Hamza Mahfooz <hamza.mahfooz@....com>, <stable@...r.kernel.org>, "Greg
 Kroah-Hartman" <gregkh@...uxfoundation.org>, "Rafael J. Wysocki"
	<rafael@...nel.org>, Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>, "Pan, Xinhui"
	<Xinhui.Pan@....com>, David Airlie <airlied@...il.com>, Daniel Vetter
	<daniel@...ll.ch>, Bjorn Helgaas <bhelgaas@...gle.com>, Mario Limonciello
	<mario.limonciello@....com>, Lijo Lazar <lijo.lazar@....com>, "Srinivasan
 Shanmugam" <srinivasan.shanmugam@....com>, Le Ma <le.ma@....com>,
	André Almeida <andrealmeid@...lia.com>, James Zhu
	<James.Zhu@....com>, Aurabindo Pillai <aurabindo.pillai@....com>, Alex Shi
	<alexs@...nel.org>, Jerry Snitselaar <jsnitsel@...hat.com>, Wei Liu
	<wei.liu@...nel.org>, Robin Murphy <robin.murphy@....com>,
	<amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-pci@...r.kernel.org>
Subject: [PATCH 3/3] drm/amdgpu: wire up the can_remove() callback

Removing an amdgpu device that still has user space references allocated
to it causes undefined behaviour. So, implement amdgpu_pci_can_remove()
and disallow devices that still have files allocated to them from being
unbound.

Cc: stable@...r.kernel.org
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index cc69005f5b46..cfa64f3c5be5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2323,6 +2323,22 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 	return ret;
 }
 
+static bool amdgpu_pci_can_remove(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	mutex_lock(&dev->filelist_mutex);
+
+	if (!list_empty(&dev->filelist)) {
+		mutex_unlock(&dev->filelist_mutex);
+		return false;
+	}
+
+	mutex_unlock(&dev->filelist_mutex);
+
+	return true;
+}
+
 static void
 amdgpu_pci_remove(struct pci_dev *pdev)
 {
@@ -2929,6 +2945,7 @@ static struct pci_driver amdgpu_kms_pci_driver = {
 	.name = DRIVER_NAME,
 	.id_table = pciidlist,
 	.probe = amdgpu_pci_probe,
+	.can_remove = amdgpu_pci_can_remove,
 	.remove = amdgpu_pci_remove,
 	.shutdown = amdgpu_pci_shutdown,
 	.driver.pm = &amdgpu_pm_ops,
-- 
2.43.0