linux-kernel - [PATCH 03/38] drm/i915: fix handling gen8_emit_flush_coherentl3

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Message-id: <1442842450-29769-4-git-send-email-a.hajda@samsung.com>
Date:	Mon, 21 Sep 2015 15:33:35 +0200
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH 03/38] drm/i915: fix handling gen8_emit_flush_coherentl3_wa
 result

The function can return negative value.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index fe06accb0..ff9a481 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1254,9 +1254,10 @@ static int gen8_init_indirectctx_bb(struct intel_engine_cs *ring,
 
 	/* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
 	if (IS_BROADWELL(ring->dev)) {
-		index = gen8_emit_flush_coherentl3_wa(ring, batch, index);
-		if (index < 0)
-			return index;
+		int rc = gen8_emit_flush_coherentl3_wa(ring, batch, index);
+		if (rc < 0)
+			return rc;
+		index = rc;
 	}
 
 	/* WaClearSlmSpaceAtContextSwitch:bdw,chv */
-- 
1.9.1

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