linux-kernel - [PATCH] drm/amd/pm: set min,max to 0 if there is no get_dpm_ultimate

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Message-Id: <20220124135259.1057828-1-trix@redhat.com>
Date:   Mon, 24 Jan 2022 05:52:59 -0800
From:   trix@...hat.com
To:     evan.quan@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...ux.ie,
        daniel@...ll.ch, nathan@...nel.org, ndesaulniers@...gle.com,
        lijo.lazar@....com, darren.powell@....com, guchun.chen@....com,
        Arunpravin.PaneerSelvam@....com, andrey.grodzovsky@....com
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] drm/amd/pm: set min,max to 0 if there is no get_dpm_ultimate_freq function

From: Tom Rix <trix@...hat.com>

clang static analysis reports this represenative problem
amdgpu_smu.c:144:18: warning: The left operand of '*' is a garbage value
        return clk_freq * 100;
               ~~~~~~~~ ^

If there is no get_dpm_ultimate_freq function,
smu_get_dpm_freq_range returns success without setting the
output min,max parameters.  Because this is an extern function,
set the min,max to 0 when there is no get_dpm_ultimate_freq.

Fixes: e5ef784b1e17 ("drm/amd/powerplay: revise calling chain on retrieving frequency range")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 5ace30434e603..35fbe51f52eaa 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -121,11 +121,17 @@ int smu_get_dpm_freq_range(struct smu_context *smu,
 	if (!min && !max)
 		return -EINVAL;
 
-	if (smu->ppt_funcs->get_dpm_ultimate_freq)
+	if (smu->ppt_funcs->get_dpm_ultimate_freq) {
 		ret = smu->ppt_funcs->get_dpm_ultimate_freq(smu,
 							    clk_type,
 							    min,
 							    max);
+	} else {
+		if (min)
+			*min = 0;
+		if (max)
+			*max = 0;
+	}
 
 	return ret;
 }
-- 
2.26.3