linux-kernel - [PATCH v2] lib/dma-debug: check for vmalloc and module addresses used with the DMA-API

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Date:	Wed, 19 Sep 2012 17:28:36 +0200
From:	Jan Luebbe <jlu@...gutronix.de>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	linux-kernel@...r.kernel.org, Jan Luebbe <jlu@...gutronix.de>
Subject: [PATCH v2] lib/dma-debug: check for vmalloc and module addresses used with the DMA-API

Signed-off-by: Jan Luebbe <jlu@...gutronix.de>
---

Changes since v1:
 - As recommended by Joerg Roedel, check for overlap with vmalloc and
   module address ranges.

 lib/dma-debug.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 66ce414..b35992b 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -944,6 +944,14 @@ static void check_for_illegal_area(struct device *dev, void *addr, unsigned long
 	if (overlap(addr, len, _text, _etext) ||
 	    overlap(addr, len, __start_rodata, __end_rodata))
 		err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
+#ifdef CONFIG_MMU
+	if (overlap(addr, len, (void *)VMALLOC_START, (void *)VMALLOC_END))
+		err_printk(dev, NULL, "DMA-API: device driver maps memory from vmalloc address range [addr=%p] [len=%lu]\n", addr, len);
+#endif
+#if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
+	if (overlap(addr, len, (void *)MODULES_VADDR, (void *)MODULES_END))
+		err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel module address range [addr=%p] [len=%lu]\n", addr, len);
+#endif
 }
 
 static void check_sync(struct device *dev,
-- 
1.7.10.4

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