[PATCH] drm/amd/amdgpu: Fix debugfs wave reader

[Tom St Denis]

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

Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 304f66ae484f..d141f7f6f225 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3025,13 +3025,14 @@ 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;
 
-- 
2.10.0