Patch "ASoC: lpass-platform: initialize dma channel number" has been added to the 4.9-stable tree

Patch "ASoC: lpass-platform: initialize dma channel number" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ASoC: lpass-platform: initialize dma channel number

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     asoc-lpass-platform-initialize-dma-channel-number.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 3b89e4b77ef9c2f985964fab17032db98f074ed0 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 8 Nov 2016 14:38:52 +0100
Subject: ASoC: lpass-platform: initialize dma channel number
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Arnd Bergmann <arnd@arndb.de>

commit 3b89e4b77ef9c2f985964fab17032db98f074ed0 upstream.

A bugfix accidentally removed the implicit initialization of the
dma channel number, causing undefined behavior when
v->alloc_dma_channel is NULL:

sound/soc/qcom/lpass-platform.c: In function ‘lpass_platform_pcmops_open’:
sound/soc/qcom/lpass-platform.c:83:29: error: ‘dma_ch’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds back an explicit initialization to zero, restoring the
previous behavior for that case.

Fixes: 022d00ee0b55 ("ASoC: lpass-platform: Fix broken pcm data usage")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/soc/qcom/lpass-platform.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/sound/soc/qcom/lpass-platform.c
+++ b/sound/soc/qcom/lpass-platform.c
@@ -78,6 +78,9 @@ static int lpass_platform_pcmops_open(st
 	dma_ch = 0;
 	if (v->alloc_dma_channel)
 		dma_ch = v->alloc_dma_channel(drvdata, dir);
+	else
+		dma_ch = 0;
+
 	if (dma_ch < 0)
 		return dma_ch;
 


Patches currently in stable-queue which might be from arnd@arndb.de are

queue-4.9/asoc-lpass-platform-initialize-dma-channel-number.patch
queue-4.9/scsi-mvsas-fix-command_active-typo.patch
queue-4.9/debugfs-improve-define_debugfs_attribute-for-config_debug_fs.patch
queue-4.9/f2fs-hide-a-maybe-uninitialized-warning.patch