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	Mon, 28 May 2007 05:37:34 -0400
From: Maximilian Engelhardt <maxi@daemonizer.de>
To: =?utf-8?q?Bj=C3=B6rn_Steinbrink?= <B.Steinbrink@gmx.de>
Subject: Re: Oops with prism54 in 2.6.22-rc3
Date: Mon, 28 May 2007 11:37:17 +0200
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
	linux-wireless <linux-wireless@vger.kernel.org>, acme@redhat.com,
	davem@davemloft.net
References: <200705261442.34054.maxi@daemonizer.de> <20070528014339.GA6136@atjola.homenet>
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On Monday 28 May 2007, Bj=C3=B6rn Steinbrink wrote:
> On 2007.05.26 14:42:30 +0200, Maximilian Engelhardt wrote:
> > Hello,
> >
> > when using the prism54 driver including in the 2.6.22-rc3 kernel I get
> > this Oops when putting the card into monitor mode:
> >
> > BUG: unable to handle kernel NULL pointer dereference at virtual address
> > 000001d8
> >  printing eip:
> > c0500608
> > *pde =3D 00000000
> > Oops: 0002 [#1]
> > PREEMPT
> > Modules linked in: fuse
> > CPU:    0
> > EIP:    0060:[<c0500608>]    Not tainted VLI
> > EFLAGS: 00010046   (2.6.22-rc3 #2)
> > EIP is at netif_rx+0x48/0xc0
> > eax: 00000000   ebx: c18fdbc0   ecx: c087991c   edx: c0879910
> > esi: 00000246   edi: f7c68010   ebp: f7fe0ba0   esp: c07bbef0
> > ds: 007b   es: 007b   fs: 0000  gs: 0000  ss: 0068
> > Process swapper (pid: 0, ti=3Dc07ba000 task=3Dc075a280 task.ti=3Dc07ba0=
00)
> > Stack: f7ec0000 00000000 c03d2b8f c07bbf24 00000082 f7c68024 f7fe0800
> > c18fdbc0 00000070 00000046 00000286 00000286 00000008 00000007 0032dcd5
> > 00000000 f7fe0ba0 00000002 f7fe0800 c03d913d 00000000 00000000 f7f4d2c0
> > 00000000 Call Trace:
> >  [<c03d2b8f>] islpci_eth_receive+0x12f/0x590
> >  [<c03d913d>] islpci_interrupt+0x1cd/0x280
> >  [<c0144e15>] handle_IRQ_event+0x25/0x50
> >  [<c014669c>] handle_fasteoi_irq+0x5c/0xe0
> >  [<c010674a>] do_IRQ+0x4a/0x80
> >  [<c010498f>] common_interrupt+0x23/0x28
> >  [<c0102b3a>] default_idle+0x2a/0x40
> >  [<c01023e3>] cpu_idle+0x43/0x80
> >  [<c07bcb2a>] start_kernel+0x21a/0x260
> >  [<c07bc450>] unknown_bootoption+0x0/0x260
> >  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > Code: c7 43 0c 00 00 00 00 c7 43 10 00 00 00 00 9c 5e fa ff 05 bc 9c 87
> > c0 a1 0c 99 87 c0 3b 05 c0 4a 7b c0 77 30 85 c0 74 43 8b 43 14 <ff> 80 =
d8
> > 01 00 00 a1 08 99 87 c0 ff 05 0c 99 87 c0 c7 03 04 99
> > EIP: [<c0500608>] netif_rx+0x48/0xc0 SS:ESP 0068:c07bbef0
> > Kernel panic - not syncing: Fatal exception in interrupt
> >
> > After this the system is frozen. Using kernel 2.6.21 everything works
> > fine, I can capture packets in monitor mode and do not get any Oops.
>
> That's probably due to commit 4c13eb6657fe9ef7b4dc8f1a405c902e9e5234e0,
> which moved the setting of skb->dev into eth_type_trans, which is never
> called when the card is in monitor mode.
>
> Could you try this patch?
>
>
> Manually set the device of a skb for prism54 cards that are in monitor
> mode as we never call eth_type_trans in that case.
>
> Signed-off-by: Bj=C3=B6rn Steinbrink <B.Steinbrink@gmx.de>
> ---
> diff --git a/drivers/net/wireless/prism54/islpci_eth.c
> b/drivers/net/wireless/prism54/islpci_eth.c index dd070cc..f49eb06 100644
> --- a/drivers/net/wireless/prism54/islpci_eth.c
> +++ b/drivers/net/wireless/prism54/islpci_eth.c
> @@ -378,9 +378,10 @@ islpci_eth_receive(islpci_private *priv)
>  	display_buffer((char *) skb->data, skb->len);
>  #endif
>  	/* take care of monitor mode and spy monitoring. */
> -	if (unlikely(priv->iw_mode =3D=3D IW_MODE_MONITOR))
> +	if (unlikely(priv->iw_mode =3D=3D IW_MODE_MONITOR)) {
> +		skb->dev =3D ndev;
>  		discard =3D islpci_monitor_rx(priv, &skb);
> -	else {
> +	} else {
>  		if (unlikely(skb->data[2 * ETH_ALEN] =3D=3D 0)) {
>  			/* The packet has a rx_annex. Read it for spy monitoring, Then
>  			 * remove it, while keeping the 2 leading MAC addr.

With this patch monitor mode does work fine.

Maxi

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