From: Lu Yao yaolu@kylinos.cn

stable inclusion from stable-v5.10.215 commit 974f127fcf6552ecd5b76c36c7b107e77b2febf9 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9J6AL CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=l...

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[ Upstream commit 2161e09cd05a50d80736fe397145340d2e8f6c05 ]

For 'AMDGPU_FAMILY_SI' family cards, in 'si_common_early_init' func, init 'didt_rreg' and 'didt_wreg' to 'NULL'. But in func 'amdgpu_debugfs_regs_didt_read/write', using 'RREG32_DIDT' 'WREG32_DIDT' lacks of relevant judgment. And other 'amdgpu_ip_block_version' that use these two definitions won't be added for 'AMDGPU_FAMILY_SI'.

So, add null pointer judgment before calling.

Reviewed-by: Christian König christian.koenig@amd.com Signed-off-by: Lu Yao yaolu@kylinos.cn Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Baogen Shang baogen.shang@windriver.com --- drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c index 48df32dd352e..3e573077368b 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c @@ -459,6 +459,9 @@ static ssize_t amdgpu_debugfs_regs_didt_read(struct file *f, char __user *buf, if (size & 0x3 || *pos & 0x3) return -EINVAL;

+ if (!adev->didt_rreg) + return -EOPNOTSUPP; + r = pm_runtime_get_sync(adev_to_drm(adev)->dev); if (r < 0) { pm_runtime_put_autosuspend(adev_to_drm(adev)->dev); @@ -518,6 +521,9 @@ static ssize_t amdgpu_debugfs_regs_didt_write(struct file *f, const char __user if (size & 0x3 || *pos & 0x3) return -EINVAL;

+ if (!adev->didt_wreg) + return -EOPNOTSUPP; + r = pm_runtime_get_sync(adev_to_drm(adev)->dev); if (r < 0) { pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);