This is a note to let you know that I've just added the patch titled
ALSA: ali5451: Fix out-of-bound position reporting
to the 4.4-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:
alsa-ali5451-fix-out-of-bound-position-reporting.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From db68577966abc1aeae4ec597b3dcfa0d56e92041 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Wed, 21 Sep 2016 14:38:02 +0200
Subject: ALSA: ali5451: Fix out-of-bound position reporting
From: Takashi Iwai <tiwai@xxxxxxx>
commit db68577966abc1aeae4ec597b3dcfa0d56e92041 upstream.
The pointer callbacks of ali5451 driver may return the value at the
boundary occasionally, and it results in the kernel warning like
snd_ali5451 0000:00:06.0: BUG: , pos = 16384, buffer size = 16384, period size = 1024
It seems that folding the position offset is enough for fixing the
warning and no ill-effect has been seen by that.
Reported-by: Enrico Mioso <mrkiko.rs@xxxxxxxxx>
Tested-by: Enrico Mioso <mrkiko.rs@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/pci/ali5451/ali5451.c | 2 ++
1 file changed, 2 insertions(+)
--- a/sound/pci/ali5451/ali5451.c
+++ b/sound/pci/ali5451/ali5451.c
@@ -1408,6 +1408,7 @@ snd_ali_playback_pointer(struct snd_pcm_
spin_unlock(&codec->reg_lock);
dev_dbg(codec->card->dev, "playback pointer returned cso=%xh.\n", cso);
+ cso %= runtime->buffer_size;
return cso;
}
@@ -1428,6 +1429,7 @@ static snd_pcm_uframes_t snd_ali_pointer
cso = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2));
spin_unlock(&codec->reg_lock);
+ cso %= runtime->buffer_size;
return cso;
}
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-4.4/alsa-ali5451-fix-out-of-bound-position-reporting.patch
queue-4.4/alsa-usb-audio-extend-dragonfly-db-scale-quirk-to-cover-other-variants.patch
queue-4.4/alsa-usb-line6-use-the-same-declaration-as-definition-in-header-for-midi-manufacturer-id.patch
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