From: MONTANARO Luciano (MM) <luciano.montanaro@magnetimarelli.com>
Date: Tue, 4 Mar 2014 11:51:36 +0000 (+0100)
Subject: pcm: Wrap hw_ptr to boundary in pcm_ioplug
X-Git-Tag: v1.0.28~20
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=688004a6acf7d1d568a660546816a092b6cc32ed;p=alsa-lib.git

pcm: Wrap hw_ptr to boundary in pcm_ioplug

The function snd_pcm_ioplug_hw_ptr_update() always increased the hw_ptr
by delta, without wrapping it to the boundary. This would lead to
problems when after many hours, the hw_ptr would overflow.

Signed-off-by: Luciano Montanaro <luciano.montanaro@magnetimarelli.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/src/pcm/pcm_ioplug.c b/src/pcm/pcm_ioplug.c
index a90c8445..c1c3a983 100644
--- a/src/pcm/pcm_ioplug.c
+++ b/src/pcm/pcm_ioplug.c
@@ -60,7 +60,7 @@ static void snd_pcm_ioplug_hw_ptr_update(snd_pcm_t *pcm)
 			delta = hw - io->last_hw;
 		else
 			delta = pcm->buffer_size + hw - io->last_hw;
-		io->data->hw_ptr += delta;
+		snd_pcm_mmap_hw_forward(io->data->pcm, delta);
 		io->last_hw = hw;
 	} else
 		io->data->state = SNDRV_PCM_STATE_XRUN;