On 11/22/2022 8:19 PM, Alex Deucher wrote:
On Tue, Nov 22, 2022 at 6:12 AM Xiongfeng Wang
<wangxiongfeng2@xxxxxxxxxx> wrote:
As comment of pci_get_class() says, it returns a pci_device with its
refcount increased and decreased the refcount for the input parameter
@from if it is not NULL.
If we break the loop in radeon_atrm_get_bios() with 'pdev' not NULL, we
need to call pci_dev_put() to decrease the refcount. Add the missing
pci_dev_put() to avoid refcount leak.
For both patches, I think pci_dev_put() needs to go into the loops.
There are 2 or more GPUs on the systems where this is relevant.
As per the logic, the loop breaks when it finds a valid ATRM handle. So
dev_put is required only for that device.
When inside the loop this happens - "decreased the refcount for the
input parameter @from if it is not NULL"
Thanks,
Lijo
Alex
Fixes: d8ade3526b2a ("drm/radeon: handle non-VGA class pci devices with ATRM")
Fixes: c61e2775873f ("drm/radeon: split ATRM support out from the ATPX handler (v3)")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_bios.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 33121655d50b..2df6ce3e32cb 100644
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -227,6 +227,7 @@ static bool radeon_atrm_get_bios(struct radeon_device *rdev)
if (!found)
return false;
+ pci_dev_put(pdev);
rdev->bios = kmalloc(size, GFP_KERNEL);
if (!rdev->bios) {
--
2.20.1
