drm/amd/amdgpu: Fix debugfs wave reader

On non VI/CZ platforms it would not free
the grbm index lock.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 62c3604..188b8e0 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2958,13 +2958,14 @@ static ssize_t amdgpu_debugfs_wave_read(struct file *f, char __user *buf,
                data[x++] = wave_read_ind(adev, 0x2378, 0x2379, simd, wave, 0x14);
                data[x++] = wave_read_ind(adev, 0x2378, 0x2379, simd, wave, 0x1A);
                data[x++] = wave_read_ind(adev, 0x2378, 0x2379, simd, wave, 0x1B);
-       } else {
-               return -EINVAL;
        }
 
        amdgpu_gfx_select_se_sh(adev, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
        mutex_unlock(&adev->grbm_idx_mutex);
 
+       if (!x)
+               return -EINVAL;
+
        while (size && (*pos < x * 4)) {
                uint32_t value;