linux-kernel - [PATCH] iommu: moving initialization earlier

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Date:	Thu, 13 Dec 2012 17:28:35 +1100
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] iommu: moving initialization earlier

The iommu_init() call initializes IOMMU internal structures and data
required for the API to function such as iommu_group_alloc().
It is registered as a subsys_initcall.

One of the IOMMU users is a PCI subsystem on POWER which discovers new
IOMMU tables during the PCI scan so the most logical place to call
iommu_group_alloc() is when a new group is just discovered. However
PCI scan is done from subsys_initcall hook as well what makes
using of the IOMMU API impossible.

The patch moves IOMMU subsystem initialization one step earlier.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
---
 drivers/iommu/iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index de857bb..b0afd3d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -865,7 +865,7 @@ printk("%s %u\n", __func__, __LINE__);

 	return 0;
 }
-subsys_initcall(iommu_init);
+arch_initcall(iommu_init);

 int iommu_domain_get_attr(struct iommu_domain *domain,
 			  enum iommu_attr attr, void *data)
-- 
1.7.10.4

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