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ALSA: pcm - Safer boundary checks 

Make the boundary checks a bit safer.
These caese are rare or theoretically won't happen, but nothing
bad to keep the checks safer...

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-03-20 16:26:15 +01:00
parent ded652f702
commit 8b22d943c3
1 changed files with 5 additions and 4 deletions
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9
sound/core/pcm_lib.c
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@ -222,8 +222,9 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
delta = new_hw_ptr - hw_ptr_interrupt;
if (hw_ptr_interrupt >= runtime->boundary) {
hw_ptr_interrupt %= runtime->boundary;
if (!hw_base) /* hw_base was already lapped; recalc delta */
hw_ptr_interrupt -= runtime->boundary;
if (hw_base < runtime->boundary / 2)
/* hw_base was already lapped; recalc delta */
delta = new_hw_ptr - hw_ptr_interrupt;
}
if (delta < 0) {
@ -241,7 +242,7 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
delta = 0;
} else {
hw_base += runtime->buffer_size;
if (hw_base == runtime->boundary)
if (hw_base >= runtime->boundary)
hw_base = 0;
new_hw_ptr = hw_base + pos;
}
@ -296,7 +297,7 @@ int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
return 0;
}
hw_base += runtime->buffer_size;
if (hw_base == runtime->boundary)
if (hw_base >= runtime->boundary)
hw_base = 0;
new_hw_ptr = hw_base + pos;
}