linux-kernel - [ 055/187] iommu/tegra: smmu: Fix unsleepable memory allocation

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Message-Id: <20120712191527.456311708@linuxfoundation.org>
Date:	Thu, 12 Jul 2012 15:33:31 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Hiroshi DOYU <hdoyu@...dia.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [ 055/187] iommu/tegra: smmu: Fix unsleepable memory allocation

From: Greg KH <gregkh@...uxfoundation.org>

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hiroshi DOYU <hdoyu@...dia.com>

commit 8f53dc724a83a0082184fa27df80c25c7df47340 upstream.

allo_pdir() is called in smmu_iommu_domain_init() with spin_lock
held. memory allocations in it have to be atomic/unsleepable.

Signed-off-by: Hiroshi DOYU <hdoyu@...dia.com>
Reported-by: Chris Wright <chrisw@...s-sol.org>
Acked-by: Chris Wright <chrisw@...s-sol.org>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/tegra-smmu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -550,13 +550,13 @@ static int alloc_pdir(struct smmu_as *as
 		return 0;
 
 	as->pte_count = devm_kzalloc(smmu->dev,
-		     sizeof(as->pte_count[0]) * SMMU_PDIR_COUNT, GFP_KERNEL);
+		     sizeof(as->pte_count[0]) * SMMU_PDIR_COUNT, GFP_ATOMIC);
 	if (!as->pte_count) {
 		dev_err(smmu->dev,
 			"failed to allocate smmu_device PTE cunters\n");
 		return -ENOMEM;
 	}
-	as->pdir_page = alloc_page(GFP_KERNEL | __GFP_DMA);
+	as->pdir_page = alloc_page(GFP_ATOMIC | __GFP_DMA);
 	if (!as->pdir_page) {
 		dev_err(smmu->dev,
 			"failed to allocate smmu_device page directory\n");


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