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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jonathan Marek <jonathan@marek.ca>,
        Akhil P Oommen <akhilpo@codeaurora.org>,
        Rob Clark <robdclark@chromium.org>
Subject: [PATCH 5.10 102/131] drm/msm/a6xx: avoid shadow NULL reference in failure path
Date:   Mon, 14 Jun 2021 12:27:43 +0200
Message-Id: <20210614102656.466490738@linuxfoundation.org>
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From: Jonathan Marek <jonathan@marek.ca>

commit ce86c239e4d218ae6040bec18e6d19a58edb8b7c upstream.

If a6xx_hw_init() fails before creating the shadow_bo, the a6xx_pm_suspend
code referencing it will crash. Change the condition to one that avoids
this problem (note: creation of shadow_bo is behind this same condition)

Fixes: e8b0b994c3a5 ("drm/msm/a6xx: Clear shadow on suspend")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Akhil P Oommen <akhilpo@codeaurora.org>
Link: https://lore.kernel.org/r/20210513171431.18632-6-jonathan@marek.ca
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1128,7 +1128,7 @@ static int a6xx_pm_suspend(struct msm_gp
 	if (ret)
 		return ret;
 
-	if (adreno_gpu->base.hw_apriv || a6xx_gpu->has_whereami)
+	if (a6xx_gpu->shadow_bo)
 		for (i = 0; i < gpu->nr_rings; i++)
 			a6xx_gpu->shadow[i] = 0;