drm/amdgpu: fix amdgpu_ras_block_late_init error handler

Clang build fails with
amdgpu_ras.c:2416:7: error: variable 'ras_obj' is used uninitialized
  whenever 'if' condition is true
  if (adev->in_suspend || amdgpu_in_reset(adev)) {
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

amdgpu_ras.c:2453:6: note: uninitialized use occurs here
 if (ras_obj->ras_cb)
     ^~~~~~~

There is a logic error in the error handler's labels.
ex/ The sysfs: is the last goto label in the normal code but
is the middle of error handler.  Rework the error handler.

cleanup: is the first error, so it's handler should be last.

interrupt: is the second error, it's handler is next.  interrupt:
handles the failure of amdgpu_ras_interrupt_add_hander() by
calling amdgpu_ras_interrupt_remove_handler().  This is wrong,
remove() assumes the interrupt has been setup, not torn down by
add().  Change the goto label to cleanup.

sysfs is the last error, it's handler should be first.  sysfs:
handles the failure of amdgpu_ras_sysfs_create() by calling
amdgpu_ras_sysfs_remove().  But when the create() fails there
is nothing added so there is nothing to remove.  This error
handler is not needed. Remove the error handler and change
goto label to interrupt.

Fixes: b293e891b057 ("drm/amdgpu: add helper function to do common ras_late_init/fini (v3)")
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index d60123e9d0456447c688bbe00baf05be548731c5..61f589b6fe5e6b239cd02aa9e0d469af7d1fe0e3 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -2432,12 +2432,12 @@ int amdgpu_ras_block_late_init(struct amdgpu_device *adev,
        if (ras_obj->ras_cb) {
                r = amdgpu_ras_interrupt_add_handler(adev, ras_block);
                if (r)
-                       goto interrupt;
+                       goto cleanup;
        }
 
        r = amdgpu_ras_sysfs_create(adev, ras_block);
        if (r)
-               goto sysfs;
+               goto interrupt;
 
        /* Those are the cached values at init.
         */
@@ -2447,12 +2447,11 @@ int amdgpu_ras_block_late_init(struct amdgpu_device *adev,
        }
 
        return 0;
-cleanup:
-       amdgpu_ras_sysfs_remove(adev, ras_block);
-sysfs:
+
+interrupt:
        if (ras_obj->ras_cb)
                amdgpu_ras_interrupt_remove_handler(adev, ras_block);
-interrupt:
+cleanup:
        amdgpu_ras_feature_enable(adev, ras_block, 0);
        return r;
 }