在 2020/12/22 6:02, Daniel Vetter 写道:
On Mon, Dec 21, 2020 at 08:45:22AM +0800, Tian Tao wrote:
Using the managed function simplifies the error handling. After
unloading the driver, the PCI device should now get disabled as
well.
Signed-off-by: Tian Tao <tiantao6@xxxxxxxxxxxxx>
---
drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
index 02f3bd1..7159018 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
@@ -329,7 +329,7 @@ static int hibmc_pci_probe(struct pci_dev *pdev,
dev->pdev = pdev;
pci_set_drvdata(pdev, dev);
- ret = pci_enable_device(pdev);
+ ret = pcim_enable_device(pdev);
if (ret) {
drm_err(dev, "failed to enable pci device: %d\n", ret);
goto err_free;
@@ -338,7 +338,7 @@ static int hibmc_pci_probe(struct pci_dev *pdev,
ret = hibmc_load(dev);
if (ret) {
drm_err(dev, "failed to load hibmc: %d\n", ret);
- goto err_disable;
+ goto err_free;
}
ret = drm_dev_register(dev, 0);
@@ -354,8 +354,6 @@ static int hibmc_pci_probe(struct pci_dev *pdev,
err_unload:
hibmc_unload(dev);
-err_disable:
- pci_disable_device(pdev);
err_free:
drm_dev_put(dev);
The drm_dev_put here and in hibmc_pci_remove is wrong, devm_drm_dev_alloc
takes care of that already. I'm kinda suprised you don't have a refcount
underrun already - do you test module unload with KASAN enabled?
Thanks for helping to review the code，and kindly giving me advice。
this problem have been fixed。
c855af2f9c5c60760fd1bed7889a81bc37d2591d drm/hisilicon: Fix use-after-free
The pcim patch looks ok, so Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cheers, Daniel
--
2.7.4
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