linux-kernel - Re: iwl3945 prints warning

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Message-ID: <20130129130850.GC2306@redhat.com>
Date:	Tue, 29 Jan 2013 14:08:50 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Zdenek Kabelac <zkabelac@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-wireless@...r.kernel.org
Subject: Re: iwl3945 prints warning

On Mon, Jan 28, 2013 at 03:09:03PM +0100, Zdenek Kabelac wrote:
> I'm getting tthis warning printed with current 3.8-rc  kernel
> My hw is Lenovo  T61.
> 
> 
> [    5.920284] iwl3945 0000:03:00.0: loaded firmware version 15.32.2.9
> [    5.976605] systemd[1]: Started NFS file locking service..
> [    5.982624] NFSD: starting 90-second grace period (net ffffffff81aa08c0)
> [    5.987930] ------------[ cut here ]------------
> [    5.988026] WARNING: at lib/dma-debug.c:933 check_unmap+0x4ae/0x9a0()
> [    5.988111] Hardware name: 6464CTO
> [    5.988194] iwl3945 0000:03:00.0: DMA-API: device driver failed
> to check map error[device address=0x00000000bb7a7800] [size=4096
> bytes] [mapped as page]

We have to check dma_map_*() error. Fixing all of calls to dma_map* in
iwlegacy is not so simple. For now, you can just ignore this WARNING or
disable CONFIG_DMA_API_DEBUG. 

Stanislaw
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