linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [PATCH] lib/dma-debug: check for vmalloc buffers used with the DMA-API
@ 2012-09-03 11:00 Jan Luebbe
  2012-09-18 13:18 ` Joerg Roedel
  0 siblings, 1 reply; 3+ messages in thread
From: Jan Luebbe @ 2012-09-03 11:00 UTC (permalink / raw)
  To: Joerg Roedel; +Cc: linux-kernel, Jan Luebbe

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
I'm not sure why we don't check for high memory, is there any problem
with this approach?

 lib/dma-debug.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 66ce414..7d60ff0 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -944,6 +944,9 @@ 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);
+	if (is_vmalloc_or_module_addr(addr) ||
+	    is_vmalloc_or_module_addr(addr+len))
+		err_printk(dev, NULL, "DMA-API: device driver maps memory from vmalloc or module address range [addr=%p] [len=%lu]\n", addr, len);
 }
 
 static void check_sync(struct device *dev,
-- 
1.7.10.4


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2012-09-19 15:29 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-09-03 11:00 [PATCH] lib/dma-debug: check for vmalloc buffers used with the DMA-API Jan Luebbe
2012-09-18 13:18 ` Joerg Roedel
2012-09-19 15:28   ` [PATCH v2] lib/dma-debug: check for vmalloc and module addresses " Jan Luebbe

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).