drm/i915/selftests: Handle a potential failure of intel_ring_begin

Silence smatch over: drivers/gpu/drm/i915/selftests/intel_workarounds.c:58 read_nonprivs() error: 'cs' dereferencing possible ERR_PTR() by handling a potential (but unlikely) failure of intel_ring_begin. Fixes: f4ecfbf ("drm/i915: Check whitelist registers across resets") Signed-off-by: Oscar Mateo <[email protected]> Cc: Chris Wilson <[email protected]> Reviewed-by: Chris Wilson <[email protected]> Signed-off-by: Chris Wilson <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
olifre · Apr 17, 2018 · 94f8dfc · 94f8dfc
1 parent 9f172f6
commit 94f8dfc
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/drivers/gpu/drm/i915/selftests/intel_workarounds.c b/drivers/gpu/drm/i915/selftests/intel_workarounds.c
@@ -54,6 +54,11 @@ read_nonprivs(struct i915_gem_context *ctx, struct intel_engine_cs *engine)
 		srm++;
 
 	cs = intel_ring_begin(rq, 4 * RING_MAX_NONPRIV_SLOTS);
+	if (IS_ERR(cs)) {
+		err = PTR_ERR(cs);
+		goto err_req;
+	}
+
 	for (i = 0; i < RING_MAX_NONPRIV_SLOTS; i++) {
 		*cs++ = srm;
 		*cs++ = i915_mmio_reg_offset(RING_FORCE_TO_NONPRIV(base, i));
@@ -75,6 +80,8 @@ read_nonprivs(struct i915_gem_context *ctx, struct intel_engine_cs *engine)
 
 	return result;
 
+err_req:
+	i915_request_add(rq);
 err_pin:
 	i915_vma_unpin(vma);
 err_obj: