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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@samsung.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Andrzej Hajda 2015-09-21 15:33:35 +02:00 committed by Daniel Vetter
parent 5389e916c3
commit 604ef73468
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/i915/intel_lrc.c
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@ -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 */