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Date: Wed, 15 Feb 2017 22:41:34 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Takashi Iwai" <tiwai@...e.de>, "Enrico Mioso" <mrkiko.rs@...il.com> Subject: [PATCH 3.2 024/126] ALSA: ali5451: Fix out-of-bound position reporting 3.2.85-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai <tiwai@...e.de> 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@...il.com> Tested-by: Enrico Mioso <mrkiko.rs@...il.com> Signed-off-by: Takashi Iwai <tiwai@...e.de> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- sound/pci/ali5451/ali5451.c | 2 ++ 1 file changed, 2 insertions(+) --- a/sound/pci/ali5451/ali5451.c +++ b/sound/pci/ali5451/ali5451.c @@ -1422,6 +1422,7 @@ snd_ali_playback_pointer(struct snd_pcm_ spin_unlock(&codec->reg_lock); snd_ali_printk("playback pointer returned cso=%xh.\n", cso); + cso %= runtime->buffer_size; return cso; } @@ -1442,6 +1443,7 @@ 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; }
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