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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-08-23 15:27:25 +0200
committerTakashi Iwai <tiwai@suse.de>2009-08-23 18:58:07 +0200
commit70bdbd3d1ae9c4ca3e84a43df34262face26575d (patch)
tree667e5e1b54749f5dedfabb22f5d884429332a145
parentf065fabc864f4c98857bf67caa2365e9f8545751 (diff)
ALSA: ali5451: fix timeout handling in snd_ali_{codecs,timer}_ready()
Modify loops in such way that the register value is checked also after the timeout condition, just in case the heavy interrupt load etc. caused the thread to sleep for the time period exceeding the timeout value. While at it remove an extra ALI_STIMER read from snd_ali_stimer_ready(). Reported-by: Jack Byer <ojbyer@usa.net> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/pci/ali5451/ali5451.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/sound/pci/ali5451/ali5451.c b/sound/pci/ali5451/ali5451.c
index c551006e292..76d76c08339 100644
--- a/sound/pci/ali5451/ali5451.c
+++ b/sound/pci/ali5451/ali5451.c
@@ -310,12 +310,16 @@ static int snd_ali_codec_ready(struct snd_ali *codec,
unsigned int res;
end_time = jiffies + msecs_to_jiffies(250);
- do {
+
+ for (;;) {
res = snd_ali_5451_peek(codec,port);
if (!(res & 0x8000))
return 0;
+ if (!time_after_eq(end_time, jiffies))
+ break;
schedule_timeout_uninterruptible(1);
- } while (time_after_eq(end_time, jiffies));
+ }
+
snd_ali_5451_poke(codec, port, res & ~0x8000);
snd_printdd("ali_codec_ready: codec is not ready.\n ");
return -EIO;
@@ -327,15 +331,17 @@ static int snd_ali_stimer_ready(struct snd_ali *codec)
unsigned long dwChk1,dwChk2;
dwChk1 = snd_ali_5451_peek(codec, ALI_STIMER);
- dwChk2 = snd_ali_5451_peek(codec, ALI_STIMER);
-
end_time = jiffies + msecs_to_jiffies(250);
- do {
+
+ for (;;) {
dwChk2 = snd_ali_5451_peek(codec, ALI_STIMER);
if (dwChk2 != dwChk1)
return 0;
+ if (!time_after_eq(end_time, jiffies))
+ break;
schedule_timeout_uninterruptible(1);
- } while (time_after_eq(end_time, jiffies));
+ }
+
snd_printk(KERN_ERR "ali_stimer_read: stimer is not ready.\n");
return -EIO;
}