Am 20.03.21 um 21:10 schrieb Tong Zhang:
TTM_PL_VRAM may not initialized at all when calling
radeon_bo_evict_vram(). We need to check before doing eviction.
[ 2.160837] BUG: kernel NULL pointer dereference, address: 0000000000000020
[ 2.161212] #PF: supervisor read access in kernel mode
[ 2.161490] #PF: error_code(0x0000) - not-present page
[ 2.161767] PGD 0 P4D 0
[ 2.163088] RIP: 0010:ttm_resource_manager_evict_all+0x70/0x1c0 [ttm]
[ 2.168506] Call Trace:
[ 2.168641] radeon_bo_evict_vram+0x1c/0x20 [radeon]
[ 2.168936] radeon_device_fini+0x28/0xf9 [radeon]
[ 2.169224] radeon_driver_unload_kms+0x44/0xa0 [radeon]
[ 2.169534] radeon_driver_load_kms+0x174/0x210 [radeon]
[ 2.169843] drm_dev_register+0xd9/0x1c0 [drm]
[ 2.170104] radeon_pci_probe+0x117/0x1a0 [radeon]
Signed-off-by: Tong Zhang <ztong0001@xxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_object.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 9b81786782de..04e9a8118b0e 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -384,7 +384,9 @@ int radeon_bo_evict_vram(struct radeon_device *rdev)
}
#endif
man = ttm_manager_type(bdev, TTM_PL_VRAM);
- return ttm_resource_manager_evict_all(bdev, man);
+ if (man)
+ return ttm_resource_manager_evict_all(bdev, man);
+ return 0;
You should probably code this the other way around, e.g.
If (!man)
return 0;
...
Apart from that looks good to me.
Christian.
}
void radeon_bo_force_delete(struct radeon_device *rdev)
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