From: Hiroshi DOYU <hdoyu@nvidia.com>
Date: Mon, 2 Jul 2012 11:26:38 +0000 (+0300)
Subject: iommu/tegra: smmu: Fix unsleepable memory allocation at alloc_pdir()
X-Git-Tag: v3.6-rc1~111^2^5~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e971a03af736acc6f96c200c2626d3bcb3d6927;p=pandora-kernel.git

iommu/tegra: smmu: Fix unsleepable memory allocation at alloc_pdir()

alloc_pdir() is called from smmu_iommu_domain_init() with spin_lock
held. memory allocations in alloc_pdir() had to be atomic. Instead of
converting into atomic allocation, this patch once releases a lock,
does the allocation, holds the lock again and then sees if it's raced
or not in order to avoid introducing mutex and preallocation.

Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Reported-by: Chris Wright <chrisw@sous-sol.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---

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