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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,
        Enrico Scholz <enrico.scholz@sigma-chemnitz.de>,
        Jan Luebbe <jlu@pengutronix.de>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.18 175/235] gpu: ipu-v3: csi: pass back mbus_code_to_bus_cfg error codes
Date:   Mon, 24 Sep 2018 13:52:41 +0200
Message-Id: <20180924113122.299623629@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>

[ Upstream commit d36d0e6309dd8137cf438cbb680e72eb63c81425 ]

mbus_code_to_bus_cfg() can fail on unknown mbus codes; pass back the
error to the caller.

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
[p.zabel@pengutronix.de - renamed rc to ret for consistency]
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/ipu-v3/ipu-csi.c |   20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

--- a/drivers/gpu/ipu-v3/ipu-csi.c
+++ b/drivers/gpu/ipu-v3/ipu-csi.c
@@ -318,13 +318,17 @@ static int mbus_code_to_bus_cfg(struct i
 /*
  * Fill a CSI bus config struct from mbus_config and mbus_framefmt.
  */
-static void fill_csi_bus_cfg(struct ipu_csi_bus_config *csicfg,
+static int fill_csi_bus_cfg(struct ipu_csi_bus_config *csicfg,
 				 struct v4l2_mbus_config *mbus_cfg,
 				 struct v4l2_mbus_framefmt *mbus_fmt)
 {
+	int ret;
+
 	memset(csicfg, 0, sizeof(*csicfg));
 
-	mbus_code_to_bus_cfg(csicfg, mbus_fmt->code);
+	ret = mbus_code_to_bus_cfg(csicfg, mbus_fmt->code);
+	if (ret < 0)
+		return ret;
 
 	switch (mbus_cfg->type) {
 	case V4L2_MBUS_PARALLEL:
@@ -356,6 +360,8 @@ static void fill_csi_bus_cfg(struct ipu_
 		/* will never get here, keep compiler quiet */
 		break;
 	}
+
+	return 0;
 }
 
 int ipu_csi_init_interface(struct ipu_csi *csi,
@@ -365,8 +371,11 @@ int ipu_csi_init_interface(struct ipu_cs
 	struct ipu_csi_bus_config cfg;
 	unsigned long flags;
 	u32 width, height, data = 0;
+	int ret;
 
-	fill_csi_bus_cfg(&cfg, mbus_cfg, mbus_fmt);
+	ret = fill_csi_bus_cfg(&cfg, mbus_cfg, mbus_fmt);
+	if (ret < 0)
+		return ret;
 
 	/* set default sensor frame width and height */
 	width = mbus_fmt->width;
@@ -587,11 +596,14 @@ int ipu_csi_set_mipi_datatype(struct ipu
 	struct ipu_csi_bus_config cfg;
 	unsigned long flags;
 	u32 temp;
+	int ret;
 
 	if (vc > 3)
 		return -EINVAL;
 
-	mbus_code_to_bus_cfg(&cfg, mbus_fmt->code);
+	ret = mbus_code_to_bus_cfg(&cfg, mbus_fmt->code);
+	if (ret < 0)
+		return ret;
 
 	spin_lock_irqsave(&csi->lock, flags);