linux-kernel - [PATCH AUTOSEL for 4.14 044/135] media: camss-vfe: always initialize reg at vfe_set_xbar

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Date:   Thu, 7 Dec 2017 15:45:40 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...pensource.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 044/135] media: camss-vfe: always initialize
 reg at vfe_set_xbar_cfg()

From: Mauro Carvalho Chehab <mchehab@...pensource.com>

[ Upstream commit 9917fbcfa20ab987d6381fd0365665e5c1402d75 ]

if output->wm_num is bigger than 2, the value for reg is
not initialized, as warned by smatch:
	drivers/media/platform/qcom/camss-8x16/camss-vfe.c:633 vfe_set_xbar_cfg() error: uninitialized symbol 'reg'.
	drivers/media/platform/qcom/camss-8x16/camss-vfe.c:637 vfe_set_xbar_cfg() error: uninitialized symbol 'reg'.

That shouldn't happen in practice, so add a logic that will
break the loop if i > 1, fixing the warnings.

Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Acked-by: Todor Tomov <todor.tomov@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/media/platform/qcom/camss-8x16/camss-vfe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/qcom/camss-8x16/camss-vfe.c b/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
index b22d2dfcd3c2..55232a912950 100644
--- a/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
@@ -622,6 +622,9 @@ static void vfe_set_xbar_cfg(struct vfe_device *vfe, struct vfe_output *output,
 			reg = VFE_0_BUS_XBAR_CFG_x_M_PAIR_STREAM_EN;
 			if (p == V4L2_PIX_FMT_NV12 || p == V4L2_PIX_FMT_NV16)
 				reg |= VFE_0_BUS_XBAR_CFG_x_M_PAIR_STREAM_SWAP_INTER_INTRA;
+		} else {
+			/* On current devices output->wm_num is always <= 2 */
+			break;
 		}
 
 		if (output->wm_idx[i] % 2 == 1)
-- 
2.11.0