drm/i915/gvt: Fix check error on fence mmio handler

Fix below error with minor code refactor.

CHECK   drivers/gpu/drm/i915//gvt/handlers.c
drivers/gpu/drm/i915//gvt/handlers.c:203 sanitize_fence_mmio_access() error: 'vgpu' dereferencing possible ERR_PTR()

Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index fbb908e797c4..415ef4556e67 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -188,7 +188,9 @@ void enter_failsafe_mode(struct intel_vgpu *vgpu, int reason)
 static int sanitize_fence_mmio_access(struct intel_vgpu *vgpu,
                 unsigned int fence_num, void *p_data, unsigned int bytes)
 {
-        if (fence_num >= vgpu_fence_sz(vgpu)) {
+        unsigned int max_fence = vgpu_fence_sz(vgpu);
+
+        if (fence_num >= max_fence) {
 
                 /* When guest access oob fence regs without access
                  * pv_info first, we treat guest not supporting GVT,
@@ -201,7 +203,7 @@ static int sanitize_fence_mmio_access(struct intel_vgpu *vgpu,
                 if (!vgpu->mmio.disable_warn_untrack) {
                         gvt_vgpu_err("found oob fence register access\n");
                         gvt_vgpu_err("total fence %d, access fence %d\n",
-                                        vgpu_fence_sz(vgpu), fence_num);
+                                     max_fence, fence_num);
                 }
                 memset(p_data, 0, bytes);
                 return -EINVAL;