drm/radeon: Fix PCI device refcount leak in radeon_atrm_get_bios()

[ Upstream commit 725a521a18734f65de05b8d353b5bd0d3ca4c37a ]

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.

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@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 1d99c9a..63bdc9f 100644 (file)
--- 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) {