[PATCH] drm/amdgpu/debugfs: check if pcie register callbacks are valid

[Alex Deucher]

Before trying to use them in the debugfs register access functions.

Signed-off-by: Alex Deucher <alexander.deuc...@amd.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 2cebf2145d9a..16e2c34fc18f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -525,6 +525,9 @@ static ssize_t amdgpu_debugfs_regs_pcie_read(struct file 
*f, char __user *buf,
        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;
 
+       if (!adev->pcie_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);
@@ -581,6 +584,9 @@ static ssize_t amdgpu_debugfs_regs_pcie_write(struct file 
*f, const char __user
        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;
 
+       if (!adev->pcie_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);
-- 
2.42.0