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Date:	Sun, 04 Nov 2012 10:16:57 +0100
From:	Johannes Berg <>
	LKML <>,
Subject: Re: [PATCH] wireless: iwlwifi - add dma_mapping_error() checks to
 avoid warnings

On Sat, 2012-11-03 at 19:40 -0600, Shuah Khan wrote:
> Add missing dma_mapping_error() checks to validate dma addresses returned by
> dma_map_page() calls to avoid the following warning:
> [   28.475686] WARNING: at lib/dma-debug.c:933 check_unmap+0x459/0x8a0()
> [   28.475688] Hardware name: HP EliteBook 6930p
> [   28.475690] iwlwifi 0000:03:00.0: DMA-API: device driver failed to check map error[device address=0x00000000ffffa000] [size=8192 bytes] [mapped as page]
> [   28.475691] Modules linked in: arc4 bnep rfcomm iwldvm mac80211 snd_hda_codec_analog radeon snd_hda_intel snd_hda_codec coretemp kvm_intel snd_hwdep snd_pcm iwlwifi kvm btusb bluetooth snd_seq_midi snd_rawmidi ttm cfg80211 snd_seq_midi_event drm_kms_helper pata_pcmcia drm snd_seq binfmt_misc pcmcia snd_timer snd_seq_device tpm_infineon snd dm_multipath yenta_socket joydev pcmcia_rsrc pcmcia_core hp_wmi psmouse hp_accel microcode soundcore i2c_algo_bit sparse_keymap wmi ppdev lpc_ich lis3lv02d snd_page_alloc video tpm_tis serio_raw parport_pc input_polldev mac_hid lp parport firewire_ohci firewire_core crc_itu_t sdhci_pci sdhci e1000e

Thanks for the report. Since I think doing BUG_ON() in such a scenario
is a really bad idea, I've applied a different patch with your


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