[PATCH AUTOSEL for 4.4 030/101] iommu/omap: Register driver before setting IOMMU ops

Sasha Levin
2018-03-08T05:43:30Z

From: Suman Anna <s-anna@ti.com>

[ 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.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/iommu/omap-iommu.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 3dc5b65f3990..b98d38f95237 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1295,6 +1295,7 @@ 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)
@@ -1308,11 +1309,25 @@ 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 */
--
2.14.1