From: Takashi Iwai Date: Wed, 21 Sep 2016 12:38:02 +0000 (+0200) Subject: ALSA: ali5451: Fix out-of-bound position reporting X-Git-Url: http://git.efficios.com/?p=deliverable%2Flinux.git;a=commitdiff_plain;h=80e84e00f9c9acbea67bf8badd284ab033da2fbe ALSA: ali5451: Fix out-of-bound position reporting 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 Tested-by: Enrico Mioso Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- diff --git a/sound/pci/ali5451/ali5451.c b/sound/pci/ali5451/ali5451.c index 36470af7eda7..92b819e4f729 100644 --- a/sound/pci/ali5451/ali5451.c +++ b/sound/pci/ali5451/ali5451.c @@ -1408,6 +1408,7 @@ snd_ali_playback_pointer(struct snd_pcm_substream *substream) 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(struct snd_pcm_substream *substream) cso = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2)); spin_unlock(&codec->reg_lock); + cso %= runtime->buffer_size; return cso; }