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>

diff --git a/sound/pci/ali5451/ali5451.c b/sound/pci/ali5451/ali5451.c
index c551006e292054088e5deeaae5baf277403e883a..76d76c08339bd0bb4caedf761740c25b1947cb3e 100644 (file)
--- 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;
 }