[PATCH AUTOSEL 5.2 016/171] drm/msm/a6xx: Check for ERR or NULL before iounmap

[Sasha Levin]

From: Sean Paul <seanpaul at chromium.org>

[ Upstream commit 5ca4a094ba7e1369363dcbcbde8baf06ddcdc2d1 ]

pdcptr and seqptr aren't necessarily valid, check them before trying to
unmap them.

Changes in v2:
- None

Cc: Jordan Crouse <jcrouse at codeaurora.org>
Reviewed-by: Jordan Crouse <jcrouse at codeaurora.org>
Signed-off-by: Sean Paul <seanpaul at chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190523171653.138678-3-sean@poorly.run
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 38e2cfa9cec7..418bb08bbed7 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -504,8 +504,10 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
 	wmb();
 
 err:
-	devm_iounmap(gmu->dev, pdcptr);
-	devm_iounmap(gmu->dev, seqptr);
+	if (!IS_ERR_OR_NULL(pdcptr))
+		devm_iounmap(gmu->dev, pdcptr);
+	if (!IS_ERR_OR_NULL(seqptr))
+		devm_iounmap(gmu->dev, seqptr);
 }
 
 /*
-- 
2.20.1