Nicolai Stange reports the following oops which is caused by
dereferencing rdev->pdev before it's subsequently set by
radeon_device_init(). Fix it.
BUG: unable to handle kernel NULL pointer dereference at 00000000000007cb
IP: radeon_driver_load_kms+0xeb/0x230 [radeon]
PGD 0
P4D 0
Oops: 0000 [#1] SMP
Modules linked in: amdkfd amd_iommu_v2 i915(+) radeon(+) i2c_algo_bit drm_kms_helper ttm e1000e drm sdhci_pci sdhci_acpi ptp sdhci crc32c_intel serio_raw mmc_core pps_core video i2c_hid hid_plantronics
CPU: 4 PID: 389 Comm: systemd-udevd Not tainted 4.12.0-rc1-next-20170515+ #1
Hardware name: Dell Inc. Latitude E6540/0725FP, BIOS A10 06/26/2014
task: ffff97d62c8f0000 task.stack: ffffb96f01478000
RIP: 0010:radeon_driver_load_kms+0xeb/0x230 [radeon]
RSP: 0018:ffffb96f0147b9d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff97d620085000 RCX: 0000000000610037
RDX: 0000000000000000 RSI: 000000000000002b RDI: 0000000000000000
RBP: ffffb96f0147b9e8 R08: 0000000000000002 R09: ffffb96f0147b924
R10: 0000000000000000 R11: ffff97d62edd2ec0 R12: ffff97d628d5c000
R13: 0000000000610037 R14: ffffffffc0698280 R15: 0000000000000000
FS: 00007f496363d8c0(0000) GS:ffff97d62eb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000007cb CR3: 000000022c14c000 CR4: 00000000001406e0
Call Trace:
drm_dev_register+0x146/0x1d0 [drm]
drm_get_pci_dev+0x9a/0x180 [drm]
radeon_pci_probe+0xb8/0xe0 [radeon]
local_pci_probe+0x45/0xa0
pci_device_probe+0x14f/0x1a0
driver_probe_device+0x29c/0x450
__driver_attach+0xdf/0xf0
? driver_probe_device+0x450/0x450
bus_for_each_dev+0x6c/0xc0
driver_attach+0x1e/0x20
bus_add_driver+0x170/0x270
driver_register+0x60/0xe0
? 0xffffffffc0508000
__pci_register_driver+0x4c/0x50
drm_pci_init+0xeb/0x100 [drm]
? vga_switcheroo_register_handler+0x6a/0x90
? 0xffffffffc0508000
radeon_init+0x98/0xb6 [radeon]
do_one_initcall+0x52/0x1a0
? __vunmap+0x81/0xb0
? kmem_cache_alloc_trace+0x159/0x1b0
? do_init_module+0x27/0x1f8
do_init_module+0x5f/0x1f8
load_module+0x27ce/0x2be0
SYSC_finit_module+0xdf/0x110
? SYSC_finit_module+0xdf/0x110
SyS_finit_module+0xe/0x10
do_syscall_64+0x67/0x150
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7f4962295679
RSP: 002b:00007ffdd8c4f878 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 000055c014ed8200 RCX: 00007f4962295679
RDX: 0000000000000000 RSI: 00007f4962dd19c5 RDI: 0000000000000010
RBP: 00007f4962dd19c5 R08: 0000000000000000 R09: 00007ffdd8c4f990
R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000000
R13: 000055c014ed81a0 R14: 0000000000020000 R15: 000055c0149d1fca
Code: 5d 5d c3 8b 05 a7 05 14 00 49 81 cd 00 00 08 00 85 c0 74 a3 e8 e7 c0 0e 00 84 c0 74 9a 41 f7 c5 00 00 02 00 75 91 49 8b 44 24 10 <0f> b6 90 cb 07 00 00 f6 c2 20 74 1e e9 7b ff ff ff 48 8b 40 38
RIP: radeon_driver_load_kms+0xeb/0x230 [radeon] RSP: ffffb96f0147b9d0
CR2: 00000000000007cb
---[ end trace 89cc4ba7e569c65c ]---
Reported-by: Nicolai Stange <nicstange@xxxxxxxxx>
Fixes: 7ffb0ce31cf9 ("drm/radeon: Don't register Thunderbolt eGPU with vga_switcheroo")
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
---
Awaiting a Tested-by: from Nicolai, but it's clear this is a bug and
needs to be fixed, so sending out with a proper commit message now.
The bug was only introduced to radeon, not amdgpu.
@Alex Deucher: I could push this to drm-misc-fixes but then it wouldn't
land before -rc3 because Sean Paul has already sent out the -rc2 pull.
I notice you haven't sent out a pull for -rc2 yet, so maybe you want to
take it yourself? Whichever you prefer. Thanks & sorry for the breakage!
drivers/gpu/drm/radeon/radeon_kms.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 6a68d440bc44..d0ad03674250 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -116,7 +116,7 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
if ((radeon_runtime_pm != 0) &&
radeon_has_atpx() &&
((flags & RADEON_IS_IGP) == 0) &&
- !pci_is_thunderbolt_attached(rdev->pdev))
+ !pci_is_thunderbolt_attached(dev->pdev))
flags |= RADEON_IS_PX;
/* radeon_device_init should report only fatal error
--
2.11.0
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