linux-kernel - [PATCH 4.1 036/123] dma-debug: skip debug_dma_assert

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Date:	Sat,  8 Aug 2015 15:08:34 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Haggai Eran <haggaie@...lanox.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	James Bottomley <JBottomley@...allels.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Horia Geanta <horia.geanta@...escale.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.1 036/123] dma-debug: skip debug_dma_assert_idle() when disabled

4.1-stable review patch.  If anyone has any objections, please let me know.

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

From: Haggai Eran <haggaie@...lanox.com>

commit c9d120b0b2b5069cb2ae62f8eac0cef31c8544be upstream.

If dma-debug is disabled due to a memory error, DMA unmaps do not affect
the dma_active_cacheline radix tree anymore, and debug_dma_assert_idle()
can print false warnings.

Disable debug_dma_assert_idle() when dma_debug_disabled() is true.

Signed-off-by: Haggai Eran <haggaie@...lanox.com>
Fixes: 0abdd7a81b7e ("dma-debug: introduce debug_dma_assert_idle()")
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: James Bottomley <JBottomley@...allels.com>
Cc: Florian Fainelli <f.fainelli@...il.com>
Cc: Sebastian Ott <sebott@...ux.vnet.ibm.com>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Horia Geanta <horia.geanta@...escale.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -574,6 +574,9 @@ void debug_dma_assert_idle(struct page *
 	unsigned long flags;
 	phys_addr_t cln;
 
+	if (dma_debug_disabled())
+		return;
+
 	if (!page)
 		return;
 


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