Messages in this thread | | | Subject | Re: [PATCH] drm/radeon: don't evict if not initialized | From | Christian König <> | Date | Sun, 21 Mar 2021 14:26:27 +0100 |
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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@gmail.com> > --- > 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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