linux-kernel - [PATCH][V3] drm/i915/guc: fix GEM_BUG

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Message-Id: <20180612093804.11341-1-colin.king@canonical.com>
Date:   Tue, 12 Jun 2018 10:38:04 +0100
From:   Colin King <colin.king@...onical.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][V3] drm/i915/guc: fix GEM_BUG_ON check

From: Colin Ian King <colin.king@...onical.com>

The check for level being less than zero always false because flags
is currently unsigned and can never be negative. Fix this by making
level a s32.

Detected by CoverityScan, CID#1468363 ("Macro compares unsigned to 0")

Fixes: cb5d64e9f13e ("drm/i915/guc: Allow user to control default GuC logging")
Signed-off-by: Colin Ian King <colin.king@...onical.com>

---
V3: Make level s32 and add the missing Fixes: tag, thanks to Dan Carpenter and
Jani Nikula for correcting my mistakes

---
 drivers/gpu/drm/i915/intel_guc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index 116f4ccf1bbd..bdb1fab322bf 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -205,7 +205,7 @@ void intel_guc_fini(struct intel_guc *guc)
 
 static u32 get_log_control_flags(void)
 {
-	u32 level = i915_modparams.guc_log_level;
+	s32 level = i915_modparams.guc_log_level;
 	u32 flags = 0;
 
 	GEM_BUG_ON(level < 0);
-- 
2.17.0