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

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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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Hiroshi DOYU 2012-07-02 14:26:38 +03:00 • committed by Joerg Roedel

parent 0bdbf4ccef

commit 9e971a03af

1 changed files with 45 additions and 32 deletions

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drivers/iommu/tegra-smmu.c

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