[PATCH v5 1/5] [media] davinci: VPIF: fix module loading, init errors

[Kevin Hilman]

Fix problems with automatic module loading by adding MODULE_ALIAS.  Also
fix various load-time errors cause by incorrect or not present
platform_data.

Signed-off-by: Kevin Hilman <khilman at baylibre.com>
---
 drivers/media/platform/davinci/vpif.c         |  5 ++++-
 drivers/media/platform/davinci/vpif_capture.c | 15 ++++++++++++++-
 drivers/media/platform/davinci/vpif_display.c |  6 ++++++
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
index 0380cf2e5775..f50148dcba64 100644
--- a/drivers/media/platform/davinci/vpif.c
+++ b/drivers/media/platform/davinci/vpif.c
@@ -32,6 +32,9 @@
 MODULE_DESCRIPTION("TI DaVinci Video Port Interface driver");
 MODULE_LICENSE("GPL");
 
+#define VPIF_DRIVER_NAME	"vpif"
+MODULE_ALIAS("platform:" VPIF_DRIVER_NAME);
+
 #define VPIF_CH0_MAX_MODES	22
 #define VPIF_CH1_MAX_MODES	2
 #define VPIF_CH2_MAX_MODES	15
@@ -466,7 +469,7 @@ static const struct dev_pm_ops vpif_pm = {
 
 static struct platform_driver vpif_driver = {
 	.driver = {
-		.name	= "vpif",
+		.name	= VPIF_DRIVER_NAME,
 		.pm	= vpif_pm_ops,
 	},
 	.remove = vpif_remove,
diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 5104cc0ee40e..20c4344ed118 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c
@@ -45,6 +45,7 @@ module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Debug level 0-1");
 
 #define VPIF_DRIVER_NAME	"vpif_capture"
+MODULE_ALIAS("platform:" VPIF_DRIVER_NAME);
 
 /* global variables */
 static struct vpif_device vpif_obj = { {NULL} };
@@ -647,6 +648,10 @@ static int vpif_input_to_subdev(
 
 	vpif_dbg(2, debug, "vpif_input_to_subdev\n");
 
+	if (!chan_cfg)
+		return -1;
+	if (input_index >= chan_cfg->input_count)
+		return -1;
 	subdev_name = chan_cfg->inputs[input_index].subdev_name;
 	if (subdev_name == NULL)
 		return -1;
@@ -654,7 +659,7 @@ static int vpif_input_to_subdev(
 	/* loop through the sub device list to get the sub device info */
 	for (i = 0; i < vpif_cfg->subdev_count; i++) {
 		subdev_info = &vpif_cfg->subdev_info[i];
-		if (!strcmp(subdev_info->name, subdev_name))
+		if (subdev_info && !strcmp(subdev_info->name, subdev_name))
 			return i;
 	}
 	return -1;
@@ -685,6 +690,9 @@ static int vpif_set_input(
 	if (sd_index >= 0) {
 		sd = vpif_obj.sd[sd_index];
 		subdev_info = &vpif_cfg->subdev_info[sd_index];
+	} else {
+		/* no subdevice, no input to setup */
+		return 0;
 	}
 
 	/* first setup input path from sub device to vpif */
@@ -1435,6 +1443,11 @@ static __init int vpif_probe(struct platform_device *pdev)
 	int res_idx = 0;
 	int i, err;
 
+	if (!pdev->dev.platform_data) {
+		dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
+		return -EINVAL;
+	}
+
 	vpif_dev = &pdev->dev;
 
 	err = initialize_vpif();
diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c
index 75b27233ec2f..7f632b757d32 100644
--- a/drivers/media/platform/davinci/vpif_display.c
+++ b/drivers/media/platform/davinci/vpif_display.c
@@ -42,6 +42,7 @@ module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Debug level 0-1");
 
 #define VPIF_DRIVER_NAME	"vpif_display"
+MODULE_ALIAS("platform:" VPIF_DRIVER_NAME);
 
 /* Is set to 1 in case of SDTV formats, 2 in case of HDTV formats. */
 static int ycmux_mode;
@@ -1249,6 +1250,11 @@ static __init int vpif_probe(struct platform_device *pdev)
 	int res_idx = 0;
 	int i, err;
 
+	if (!pdev->dev.platform_data) {
+		dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
+		return -EINVAL;
+	}
+
 	vpif_dev = &pdev->dev;
 	err = initialize_vpif();
 
-- 
2.9.3