[PATCH 4.14 127/173] gpu: ipu-v3: csi: pass back mbus_code_to_bus_cfg error codes

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Enrico Scholz <enrico.sch...@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.sch...@sigma-chemnitz.de>
Signed-off-by: Jan Luebbe <j...@pengutronix.de>
[p.za...@pengutronix.de - renamed rc to ret for consistency]
Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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
@@ -316,13 +316,17 @@ 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:
@@ -353,6 +357,8 @@ 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,
@@ -362,8 +368,11 @@ 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;
@@ -584,11 +593,14 @@ 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);