linux-kernel - [PATCH v2 3/3] omap iommu: kmemleak: Fix false positive with special scan

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Date:	Tue,  1 Jun 2010 13:25:11 +0300
From:	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
To:	linux-kernel@...r.kernel.org
Cc:	catalin.marinas@....com, ext-phil.2.carmody@...ia.com,
	linux-omap@...r.kernel.org, Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
Subject: [PATCH v2 3/3] omap iommu: kmemleak: Fix false positive with special scan

From: Hiroshi DOYU <Hiroshi.DOYU@...ia.com>

The fist level iommu page table address is registered with the address
conversion function for kmemleak special scan.

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
---
 arch/arm/plat-omap/iommu.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c
index a202a2c..5a19e86 100644
--- a/arch/arm/plat-omap/iommu.c
+++ b/arch/arm/plat-omap/iommu.c
@@ -894,6 +894,19 @@ void iommu_put(struct iommu *obj)
 }
 EXPORT_SYMBOL_GPL(iommu_put);
 
+static unsigned long kmemleak_special_conv(void *data, unsigned long orig)
+{
+	u32 *iopgd;
+	struct iommu *obj = (struct iommu *)data;
+
+	iopgd = iopgd_offset(obj, orig);
+
+	if (!iopgd_is_table(*iopgd))
+		return 0;
+
+	return (u32)iopgd_page_vaddr(iopgd);
+}
+
 /*
  *	OMAP Device MMU(IOMMU) detection
  */
@@ -967,6 +980,11 @@ static int __devinit omap_iommu_probe(struct platform_device *pdev)
 
 	BUG_ON(!IS_ALIGNED((unsigned long)obj->iopgd, IOPGD_TABLE_SIZE));
 
+	err = kmemleak_special_scan(p, IOPGD_TABLE_SIZE, kmemleak_special_conv,
+				    obj, THIS_MODULE);
+	if (err)
+		dev_warn(&pdev->dev, "kmemleak: failed to add special scan\n");
+
 	dev_info(&pdev->dev, "%s registered\n", obj->name);
 	return 0;
 
@@ -991,6 +1009,7 @@ static int __devexit omap_iommu_remove(struct platform_device *pdev)
 	platform_set_drvdata(pdev, NULL);
 
 	iopgtable_clear_entry_all(obj);
+	kmemleak_no_special(obj->iopgd);
 	free_pages((unsigned long)obj->iopgd, get_order(IOPGD_TABLE_SIZE));
 
 	irq = platform_get_irq(pdev, 0);
-- 
1.7.1.rc1

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