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@vger.kernel.org Signed-off-by: Hamza Mahfooz hamza.mahfooz@amd.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,