linux-kernel - Re: [rt2x00-users] ieee80211_tx

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Date:	Sat, 21 Nov 2009 16:27:40 +0100
From:	Gertjan van Wingerde <gwingerde@...il.com>
To:	david@...ntd.dyndns.org
CC:	rt2x00 Users List <users@...x00.serialmonkey.com>,
	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [rt2x00-users] ieee80211_tx_status: headroom too small

On 11/21/09 02:30, David Ellingsworth wrote:
> Wasn't sure where to send this, but with the latest 2.6.32-rc8-wl
> kernel built from the wireless-testing repository I'm getting a number
> of "ieee80211_tx_status: headroom too small" errors in my syslog. I'm
> using the rt61pci driver in conjunction with hostap as a wpa2 secured
> access point. The relevant information about my card from lspci is:
> 
> 01:08.0 0280: 1814:0301
>         Subsystem: 1458:e934
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
> ParErr- Stepping- SERR+ FastB2B- DisINTx-
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort-
> <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 64, Cache Line Size: 128 bytes
>         Interrupt: pin A routed to IRQ 18
>         Region 0: Memory at fe6f0000 (32-bit, non-prefetchable) [size=32K]
>         Capabilities: [40] Power Management version 2
>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>         Kernel driver in use: rt61pci
> 
> If you need any other information, I'll be happy to provide it.
> 

Hi David,

This seems to be caused by the rt2x00 driver not properly declaring its alignment
maneuvring space properly, and thus it doesn't leave enough headroom left for
copying to the monitor interface.

Can you check whether the attached patch fixes the issue for you?
Note: patch looks a bit bigger than it actually is due to indenting cleanups.

---
Gertjan.


View attachment "align_fix.diff" of type "text/plain" (14420 bytes)