linux-kernel - [PATCH 4.9 13/51] staging: vchiq_2835_arm: Make cache-line-size a required DT property

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Message-Id: <20171019134842.179778870@linuxfoundation.org>
Date:   Thu, 19 Oct 2017 15:48:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Zoran <mzoran@...wfest.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 13/51] staging: vchiq_2835_arm: Make cache-line-size a required DT property

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

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

From: Michael Zoran <mzoran@...wfest.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@...wfest.net>
Acked-by: Stefan Wahren <stefan.wahren@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 */