[3.13.y.z extended stable] Patch "ALSA: pcm: use the same dma mmap codepath both for arm and arm64" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Fri Oct 31 20:53:39 UTC 2014

This is a note to let you know that I have just added a patch titled

    ALSA: pcm: use the same dma mmap codepath both for arm and arm64

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:


This patch is scheduled to be released in version

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see



>From ce966fa3270e65bf697579af02d87fd5a3564049 Mon Sep 17 00:00:00 2001
From: Anatol Pomozov <anatol.pomozov at gmail.com>
Date: Fri, 17 Oct 2014 12:43:34 -0700
Subject: ALSA: pcm: use the same dma mmap codepath both for arm and arm64

commit a011e213f3700233ed2a676f1ef0a74a052d7162 upstream.

This avoids following kernel crash when try to playback on arm64

[  107.497203] [<ffffffc00046b310>] snd_pcm_mmap_data_fault+0x90/0xd4
[  107.503405] [<ffffffc0001541ac>] __do_fault+0xb0/0x498
[  107.508565] [<ffffffc0001576a0>] handle_mm_fault+0x224/0x7b0
[  107.514246] [<ffffffc000092640>] do_page_fault+0x11c/0x310
[  107.519738] [<ffffffc000081100>] do_mem_abort+0x38/0x98

Tested: backported to 3.14 and tried to playback on arm64 machine

Signed-off-by: Anatol Pomozov <anatol.pomozov at gmail.com>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 sound/core/pcm_native.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 01a5e05..566b0f6 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3189,7 +3189,7 @@ static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {

 /* This should be defined / handled globally! */
-#ifdef CONFIG_ARM
+#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)

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