linux-kernel - [PATCH 1/1] drm/amdgpu: fix NULL pointer dereference for Renoir

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Message-Id: <20201001195525.3477-2-dirk@gouders.net>
Date:   Thu,  1 Oct 2020 21:55:25 +0200
From:   Dirk Gouders <dirk@...ders.net>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     Dirk Gouders <dirk@...ders.net>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        Hawking Zhang <Hawking.Zhang@....com>,
        Evan Quan <evan.quan@....com>
Subject: [PATCH 1/1] drm/amdgpu: fix NULL pointer dereference for Renoir

Commit c1cf79ca5ced46 (drm/amdgpu: use IP discovery table for renoir)
introduced a NULL pointer dereference when booting with
amdgpu.discovery=0, because it removed the call of vega10_reg_base_init()
for that case.

Fix this by calling that funcion if amdgpu_discovery == 0 in addition to
the case that amdgpu_discovery_reg_base_init() failed.

Fixes: c1cf79ca5ced46 (drm/amdgpu: use IP discovery table for renoir)
Signed-off-by: Dirk Gouders <dirk@...ders.net>
Cc: Hawking Zhang <Hawking.Zhang@....com>
Cc: Evan Quan <evan.quan@....com>
---
 drivers/gpu/drm/amd/amdgpu/soc15.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
index 84d811b6e48b..f8cb62b326d6 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -694,12 +694,12 @@ static void soc15_reg_base_init(struct amdgpu_device *adev)
 		 * it doesn't support SRIOV. */
 		if (amdgpu_discovery) {
 			r = amdgpu_discovery_reg_base_init(adev);
-			if (r) {
-				DRM_WARN("failed to init reg base from ip discovery table, "
-					 "fallback to legacy init method\n");
-				vega10_reg_base_init(adev);
-			}
+			if (r == 0)
+			  break;
+			DRM_WARN("failed to init reg base from ip discovery table, "
+				 "fallback to legacy init method\n");
 		}
+		vega10_reg_base_init(adev);
 		break;
 	case CHIP_VEGA20:
 		vega20_reg_base_init(adev);
-- 
2.26.2