linux-kernel - [090/244] iommu/amd: Dont take domain->lock recursivly

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Message-Id: <20110928220134.809357657@clark.kroah.org>
Date:	Wed, 28 Sep 2011 15:00:54 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Joerg Roedel <joerg.roedel@....com>
Subject: [090/244] iommu/amd: Dont take domain->lock recursivly

3.0-stable review patch.  If anyone has any objections, please let us know.

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

From: Joerg Roedel <joerg.roedel@....com>

commit e33acde91140f1809952d1c135c36feb66a51887 upstream.

The domain_flush_devices() function takes the domain->lock.
But this function is only called from update_domain() which
itself is already called unter the domain->lock. This causes
a deadlock situation when the dma-address-space of a domain
grows larger than 1GB.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/amd_iommu.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -773,14 +773,9 @@ static void domain_flush_complete(struct
 static void domain_flush_devices(struct protection_domain *domain)
 {
 	struct iommu_dev_data *dev_data;
-	unsigned long flags;
-
-	spin_lock_irqsave(&domain->lock, flags);
 
 	list_for_each_entry(dev_data, &domain->dev_list, list)
 		device_flush_dte(dev_data->dev);
-
-	spin_unlock_irqrestore(&domain->lock, flags);
 }
 
 /****************************************************************************


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