[PATCH] drm/amd/gfx11: move the gfx mutex into the caller

[Alex Deucher]

Otherwise we can fail to drop the software mutex when
we fail to take the hardware mutex.

Fixes: 76acba7b7f12 ("drm/amdgpu/gfx11: add a mutex for the gfx semaphore")
Reported-by: Dan Carpenter <dan.carpen...@linaro.org>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c 
b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
index 5704ad25a49d6..aa7fdece8ad42 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
@@ -4747,8 +4747,6 @@ int gfx_v11_0_request_gfx_index_mutex(struct 
amdgpu_device *adev,
 {
        u32 i, tmp, val;
 
-       if (req)
-               mutex_lock(&adev->gfx.reset_sem_mutex);
        for (i = 0; i < adev->usec_timeout; i++) {
                /* Request with MeId=2, PipeId=0 */
                tmp = REG_SET_FIELD(0, CP_GFX_INDEX_MUTEX, REQUEST, req);
@@ -4769,8 +4767,6 @@ int gfx_v11_0_request_gfx_index_mutex(struct 
amdgpu_device *adev,
                }
                udelay(1);
        }
-       if (!req)
-               mutex_unlock(&adev->gfx.reset_sem_mutex);
 
        if (i >= adev->usec_timeout)
                return -EINVAL;
@@ -4818,8 +4814,10 @@ static int gfx_v11_0_soft_reset(void *handle)
        mutex_unlock(&adev->srbm_mutex);
 
        /* Try to acquire the gfx mutex before access to CP_VMID_RESET */
+       mutex_lock(&adev->gfx.reset_sem_mutex);
        r = gfx_v11_0_request_gfx_index_mutex(adev, true);
        if (r) {
+               mutex_unlock(&adev->gfx.reset_sem_mutex);
                DRM_ERROR("Failed to acquire the gfx mutex during soft 
reset\n");
                return r;
        }
@@ -4834,6 +4832,7 @@ static int gfx_v11_0_soft_reset(void *handle)
 
        /* release the gfx mutex */
        r = gfx_v11_0_request_gfx_index_mutex(adev, false);
+       mutex_unlock(&adev->gfx.reset_sem_mutex);
        if (r) {
                DRM_ERROR("Failed to release the gfx mutex during soft 
reset\n");
                return r;
-- 
2.46.0