[PATCH] drm/xe/rtp: Check hwe before calling match_func

[Jonathan Cavitt <jonathan.cavitt@intel.com>]

XE_RTP_MATCH_FUNC may attempt to dereference the target xe_hw_engine.
Ensure the hwe is not NULL before calling the function, matching
XE_RTP_MATCH_ENGINE_CLASS, for example.

This covers a static analysis issue.

Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Cc: Gustavo Sousa <gustavo.sousa@intel.com>
---
 drivers/gpu/drm/xe/xe_rtp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_rtp.c b/drivers/gpu/drm/xe/xe_rtp.c
index dec9d94e6fb0..2cd26db113d9 100644
--- a/drivers/gpu/drm/xe/xe_rtp.c
+++ b/drivers/gpu/drm/xe/xe_rtp.c
@@ -129,6 +129,9 @@ static bool rule_match_item(struct rule_match_ctx *match_ctx)
 
 		return hwe->class != r->engine_class;
 	case XE_RTP_MATCH_FUNC:
+		if (drm_WARN_ON(&xe->drm, !hwe))
+			return false;
+
 		return r->match_func(xe, gt, hwe);
 	default:
 		drm_warn(&xe->drm, "Invalid RTP match %u\n",
-- 
2.53.0