linux-kernel - [PATCH] x86/pci: fix dmar_tbl early

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Message-Id: <1222327705-22048-1-git-send-email-yhlu.kernel@gmail.com>
Date:	Thu, 25 Sep 2008 00:28:25 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH] x86/pci: fix dmar_tbl early_ioremap leak v2

use early_acpi_os_unmap_memory

v2: move unmap_memory early...

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

---
 drivers/pci/dmar.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6/drivers/pci/dmar.c
===================================================================
--- linux-2.6.orig/drivers/pci/dmar.c
+++ linux-2.6/drivers/pci/dmar.c
@@ -42,6 +42,7 @@
 LIST_HEAD(dmar_drhd_units);
 
 static struct acpi_table_header * __initdata dmar_tbl;
+static acpi_size __initdata dmar_tbl_size;
 
 static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
 {
@@ -297,8 +298,9 @@ static int __init dmar_table_detect(void
 	acpi_status status = AE_OK;
 
 	/* if we could find DMAR table, then there are DMAR devices */
-	status = acpi_get_table(ACPI_SIG_DMAR, 0,
-				(struct acpi_table_header **)&dmar_tbl);
+	status = acpi_get_table_with_size(ACPI_SIG_DMAR, 0,
+				(struct acpi_table_header **)&dmar_tbl,
+				&dmar_tbl_size);
 
 	if (ACPI_SUCCESS(status) && !dmar_tbl) {
 		printk (KERN_WARNING PREFIX "Unable to map DMAR\n");
@@ -493,6 +495,9 @@ void __init detect_intel_iommu(void)
 	}
 end:
 #endif
+	if (dmar_tbl)
+		early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size);
+
 	dmar_tbl = NULL;
 }
 
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