linux-kernel - Re: [PATCH] sound/oss/pss: Fix test of unsigned in pss_reset_dsp() and pss_download

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Message-ID: <4B2902C3.3080606@gmail.com>
Date:	Wed, 16 Dec 2009 16:54:43 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sound/oss/pss: Fix test of unsigned in pss_reset_dsp()
 and pss_download_boot()

limit and jiffies are unsigned so the test did not work.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
Found using coccinelle: http://coccinelle.lip6.fr/

>> -	for (i = 0; i < 32768 && (limit-jiffies >= 0); i++)
>> +	for (i = 0; i < 32768 && (limit >= jiffies); i++)
> 
> No, it should use time_after_eq(limit, jiffies) instead.
> 
> 
> thanks,
> 
> Takashi
> 

Ok,

diff --git a/sound/oss/pss.c b/sound/oss/pss.c
index 83f5ee2..e19dd5d 100644
--- a/sound/oss/pss.c
+++ b/sound/oss/pss.c
@@ -269,7 +269,7 @@ static int pss_reset_dsp(pss_confdata * devc)
 	unsigned long   i, limit = jiffies + HZ/10;
 
 	outw(0x2000, REG(PSS_CONTROL));
-	for (i = 0; i < 32768 && (limit-jiffies >= 0); i++)
+	for (i = 0; i < 32768 && time_after_eq(limit, jiffies); i++)
 		inw(REG(PSS_CONTROL));
 	outw(0x0000, REG(PSS_CONTROL));
 	return 1;
@@ -369,11 +369,11 @@ static int pss_download_boot(pss_confdata * devc, unsigned char *block, int size
 		outw(0, REG(PSS_DATA));
 
 		limit = jiffies + HZ/10;
-		for (i = 0; i < 32768 && (limit - jiffies >= 0); i++)
+		for (i = 0; i < 32768 && time_after_eq(limit, jiffies); i++)
 			val = inw(REG(PSS_STATUS));
 
 		limit = jiffies + HZ/10;
-		for (i = 0; i < 32768 && (limit-jiffies >= 0); i++)
+		for (i = 0; i < 32768 && time_after_eq(limit, jiffies); i++)
 		{
 			val = inw(REG(PSS_STATUS));
 			if (val & 0x4000)
--
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