staging: vchiq_2835_arm: Make cache-line-size a required DT property

The original github source allowed for the cache-line-size property
to be missing.  Since recent firmwares also require this property,
it makes sense to always require it in the driver as well.

If the cache-line-size property is missing, then the driver probe
should fail as no dev since the kernel and dt may be out of sync.
The fix is to add a check for the return value of of_property_read_u32.

Changes V2:
	1. Add error message if cache-line-size is missing.
	2. Simple check for non-zero return value from
	   of_property_read_u32.

Signed-off-by: Michael Zoran <mzoran@crowfest.net>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
index e6241fb5cfa6..3aeffcb9c87e 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -121,8 +121,14 @@ int vchiq_platform_init(struct platform_device *pdev, VCHIQ_STATE_T *state)
         if (err < 0)
                 return err;
 
-        (void)of_property_read_u32(dev->of_node, "cache-line-size",
+        err = of_property_read_u32(dev->of_node, "cache-line-size",
                                    &g_cache_line_size);
+
+        if (err) {
+                dev_err(dev, "Missing cache-line-size property\n");
+                return -ENODEV;
+        }
+
         g_fragments_size = 2 * g_cache_line_size;
 
         /* Allocate space for the channels in coherent memory */