On 11/17/2025 8:21 PM, Neil Armstrong wrote:
> On plaforms with an a7xx GPU not supporting IFPC, the ifpc_reglist
> if still deferenced in a7xx_patch_pwrup_reglist() which causes
> a kernel crash:
> Unable to handle kernel NULL pointer dereference at virtual address
> 0000000000000008
> ...
> pc : a6xx_hw_init+0x155c/0x1e4c [msm]
> lr : a6xx_hw_init+0x9a8/0x1e4c [msm]
> ...
> Call trace:
> a6xx_hw_init+0x155c/0x1e4c [msm] (P)
> msm_gpu_hw_init+0x58/0x88 [msm]
> adreno_load_gpu+0x94/0x1fc [msm]
> msm_open+0xe4/0xf4 [msm]
> drm_file_alloc+0x1a0/0x2e4 [drm]
> drm_client_init+0x7c/0x104 [drm]
> drm_fbdev_client_setup+0x94/0xcf0 [drm_client_lib]
> drm_client_setup+0xb4/0xd8 [drm_client_lib]
> msm_drm_kms_post_init+0x2c/0x3c [msm]
> msm_drm_init+0x1a4/0x228 [msm]
> msm_drm_bind+0x30/0x3c [msm]
> ...
>
> Check the validity of ifpc_reglist before deferencing the table
> to setup the register values.
>
> Fixes: a6a0157cc68e ("drm/msm/a6xx: Enable IFPC on Adreno X1-85")
> Signed-off-by: Neil Armstrong <[email protected]>
Reviewed-by: Akhil P Oommen <[email protected]>
Thanks for fixing this. Chia reported this issue a couple of weeks back.
Probably, we can add his S-b tag.
https://lore.kernel.org/lkml/capaku7qvbzmx0b8sdby1h3u-em+0py0brgkmrfguxkx1uqr...@mail.gmail.com/
-Akhil
