linux-kernel - Re: [PATCH] Only print SCSI data direction warning once for a command

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Message-Id: <1200166584.3656.36.camel@localhost.localdomain>
Date:	Sat, 12 Jan 2008 13:36:24 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	dougg@...que.net
Subject: Re: [PATCH] Only print SCSI data direction warning once for a
	command

On Wed, 2008-01-02 at 07:03 +0100, Andi Kleen wrote:
> When I use cdparanoia my logs get spammed a lot by
> 
> printk: 464 messages suppressed.
> sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in;
>    program cdparanoia not setting count and/or reply_len properly
> printk: 1078 messages suppressed.
> 
> and many more of those. With this patch the message is only printed once
> for a command in a row.

My reaction is that the intent of these warnings is to try to get people
to fix broken applications, so I'm not sure any action is appropriate;
however, it's Doug's driver, so I'll defer to him.

Even if he does say yes, though, your patch looks wrong.  It's still
going to spew the 

printk: 1078 messages suppressed.

to the log because they come from printk_ratelimit().  So all you've
done is halved the volume of flow to the logs and left a dangling printk
suppressed message that keeps spewing, so I don't think the patch even
does what you describe it as doing ...  if you reverse the order of the
operands in the if() it will ...

James

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