linux-kernel - [PATCH 12/14] staging: fsl-mc: add dpmcp version check

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Date:	Mon, 11 Apr 2016 11:56:11 -0500
From:	Stuart Yoder <stuart.yoder@....com>
To:	<gregkh@...uxfoundation.org>, <german.rivera@....com>
CC:	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
	<agraf@...e.de>, <arnd@...db.de>, <leoyang.li@....com>,
	Itai Katz <itai.katz@....com>,
	Stuart Yoder <stuart.yoder@....com>
Subject: [PATCH 12/14] staging: fsl-mc: add dpmcp version check

From: Itai Katz <itai.katz@....com>

The dpmcp driver supports dpmcp version 3.0 and above.
This patch adds the code to check the version.

Signed-off-by: Itai Katz <itai.katz@....com>
Signed-off-by: Stuart Yoder <stuart.yoder@....com>
---
 drivers/staging/fsl-mc/bus/dpmcp-cmd.h    |    6 +++---
 drivers/staging/fsl-mc/bus/mc-allocator.c |   11 +++++++++++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/dpmcp-cmd.h b/drivers/staging/fsl-mc/bus/dpmcp-cmd.h
index c6f4ec0..c9b52dd 100644
--- a/drivers/staging/fsl-mc/bus/dpmcp-cmd.h
+++ b/drivers/staging/fsl-mc/bus/dpmcp-cmd.h
@@ -32,9 +32,9 @@
 #ifndef _FSL_DPMCP_CMD_H
 #define _FSL_DPMCP_CMD_H
 
-/* DPMCP Version */
-#define DPMCP_VER_MAJOR				3
-#define DPMCP_VER_MINOR				0
+/* Minimal supported DPMCP Version */
+#define DPMCP_MIN_VER_MAJOR				3
+#define DPMCP_MIN_VER_MINOR				0
 
 /* Command IDs */
 #define DPMCP_CMDID_CLOSE				0x800
diff --git a/drivers/staging/fsl-mc/bus/mc-allocator.c b/drivers/staging/fsl-mc/bus/mc-allocator.c
index 52b16f7..4676ba1 100644
--- a/drivers/staging/fsl-mc/bus/mc-allocator.c
+++ b/drivers/staging/fsl-mc/bus/mc-allocator.c
@@ -310,6 +310,17 @@ int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
 	if (WARN_ON(!dpmcp_dev))
 		goto error_cleanup_resource;
 
+	if (dpmcp_dev->obj_desc.ver_major < DPMCP_MIN_VER_MAJOR ||
+	    (dpmcp_dev->obj_desc.ver_major == DPMCP_MIN_VER_MAJOR &&
+	     dpmcp_dev->obj_desc.ver_minor < DPMCP_MIN_VER_MINOR)) {
+		dev_err(&dpmcp_dev->dev,
+			"ERROR: Version %d.%d of DPMCP not supported.\n",
+			dpmcp_dev->obj_desc.ver_major,
+			dpmcp_dev->obj_desc.ver_minor);
+		error = -ENOTSUPP;
+		goto error_cleanup_resource;
+	}
+
 	if (WARN_ON(dpmcp_dev->obj_desc.region_count == 0))
 		goto error_cleanup_resource;
 
-- 
1.7.9.5