Patch "staging: vchiq_2835_arm: Make cache-line-size a required DT property" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     staging-vchiq_2835_arm-make-cache-line-size-a-required-dt-property.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Oct 19 15:04:02 CEST 2017
From: Michael Zoran <mzoran@crowfest.net>
Date: Sat, 18 Feb 2017 03:22:01 -0800
Subject: staging: vchiq_2835_arm: Make cache-line-size a required DT property

From: Michael Zoran <mzoran@crowfest.net>


[ Upstream commit 6cf1bf636a067eb308cb3a8322b9d6b1844a075d ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -106,8 +106,14 @@ int vchiq_platform_init(struct platform_
 
 	g_virt_to_bus_offset = virt_to_dma(dev, (void *)0);
 
-	(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 */


Patches currently in stable-queue which might be from mzoran@crowfest.net are

queue-4.9/staging-vchiq_2835_arm-make-cache-line-size-a-required-dt-property.patch