linux-kernel - Re: Extremely slow IO with a PCMCIA CompactFlash adapter

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Date:	Tue, 4 Aug 2009 12:54:08 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Jack Byer <ojbyer@....net>
Cc:	linux-kernel@...r.kernel.org,
	Robert Hancock <hancockrwd@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andreas Mohr <andi@...as.de>, linux-ide@...r.kernel.org
Subject: Re: Extremely slow IO with a PCMCIA CompactFlash adapter

On Monday 03 August 2009 03:25:18 Jack Byer wrote:
> >
> > Seems like there is also a bug in ali5451 sound driver..
> >
> > This should help:

[...]

> Those patches do not appear to have worked:

My bad, jiffies checks need to be reversed now (corrected patch attached)..

Please also post output of dmidecode command -- we may try to workaround
the issue by not using IRQ mode in pata_pcmcia for this particular system
and resorting to libata's polling mode instead..

---
 sound/pci/ali5451/ali5451.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Index: b/sound/pci/ali5451/ali5451.c
===================================================================
--- a/sound/pci/ali5451/ali5451.c
+++ b/sound/pci/ali5451/ali5451.c
@@ -314,8 +314,11 @@ static int snd_ali_codec_ready(struct sn
 		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));
+	} while (1);
+
 	snd_ali_5451_poke(codec, port, res & ~0x8000);
 	snd_printdd("ali_codec_ready: codec is not ready.\n ");
 	return -EIO;
@@ -327,15 +330,17 @@ static int snd_ali_stimer_ready(struct s
 	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 {
 		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));
+	} while (1);
+
 	snd_printk(KERN_ERR "ali_stimer_read: stimer is not ready.\n");
 	return -EIO;
 }
--
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