Patch "iommu/omap: Register driver before setting IOMMU ops" has been added to the 4.9-stable tree

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

iommu/omap: Register driver before setting IOMMU ops

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:
iommu-omap-register-driver-before-setting-iommu-ops.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 <[email protected]> know about it.

From: Suman Anna <[email protected]>
Date: Wed, 12 Apr 2017 00:21:26 -0500
Subject: iommu/omap: Register driver before setting IOMMU ops

From: Suman Anna <[email protected]>

[ Upstream commit abaa7e5b054aae567861628b74dbc7fbf8ed79e8 ]

Move the registration of the OMAP IOMMU platform driver before setting the IOMMU callbacks on the platform bus. This causes the IOMMU devices to be probed first before the .add_device() callback is invoked for all registered devices, and allows the iommu_group support to be added to the OMAP IOMMU driver.

While at this, also check for the return status from bus_set_iommu.

---
 drivers/iommu/omap-iommu.c |   21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

@@ -1299,6 +1299,7 @@ static int __init omap_iommu_init(void)
 	const unsigned long flags = SLAB_HWCACHE_ALIGN;
 	size_t align = 1 << 10; /* L2 pagetable alignement */
 	struct device_node *np;
+	int ret;
 
 	np = of_find_matching_node(NULL, omap_iommu_of_match);
 	if (!np)

@@ -1312,11 +1313,25 @@ static int __init omap_iommu_init(void)
 		return -ENOMEM;
 	iopte_cachep = p;
 
-	bus_set_iommu(&platform_bus_type, &omap_iommu_ops);
-
 	omap_iommu_debugfs_init();
 
-	return platform_driver_register(&omap_iommu_driver);
+	ret = platform_driver_register(&omap_iommu_driver);
+	if (ret) {
+		pr_err("%s: failed to register driver\n", __func__);
+		goto fail_driver;
+	}
+
+	ret = bus_set_iommu(&platform_bus_type, &omap_iommu_ops);
+	if (ret)
+		goto fail_bus;
+
+	return 0;
+
+fail_bus:
+	platform_driver_unregister(&omap_iommu_driver);
+fail_driver:
+	kmem_cache_destroy(iopte_cachep);
+	return ret;
 }
 subsys_initcall(omap_iommu_init);
 /* must be ready before omap3isp is probed */

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/iommu-omap-register-driver-before-setting-iommu-ops.patch