3.15-rc7 i915 related dma-debug warning.

[Dave Jones]

WARNING: CPU: 1 PID: 24000 at lib/dma-debug.c:593 debug_dma_assert_idle+0x1a4/0x220()
i915 0000:00:02.0: DMA-API: cpu touching an active dma mapped cacheline [cln=0x0000000004401d40]
Modules linked in: ccm ip6t_rpfilter ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iTCO_wdt iTCO_vendor_support arc4 x86_pkg_temp_thermal coretemp iwldvm kvm_intel mac80211 kvm snd_hda_codec_hdmi uvcvideo videobuf2_vmalloc snd_hda_codec_realtek videobuf2_memops snd_hda_codec_generic btusb videobuf2_core bluetooth videodev iwlwifi snd_hda_intel sdhci_pci microcode snd_hda_controller snd_hda_codec sdhci serio_raw media snd_hwdep snd_seq snd_seq_device mmc_core snd_pcm lpc_ich mfd_core cfg80211
 i2c_i801 mei_me snd_timer mei thinkpad_acpi snd soundcore rfkill shpchp nfsd auth_rpcgss nfs_acl lockd sunrpc xfs libcrc32c dm_crypt nouveau crct10dif_pclmul crc32_pclmul crc32c_intel mxm_wmi ghash_clmulni_intel i915 ttm i2c_algo_bit drm_kms_helper drm e1000e i2c_core ptp wmi pps_core video
CPU: 1 PID: 24000 Comm: bash Not tainted 3.15.0-0.rc7.git2.1.fc21.x86_64 #1
Hardware name: LENOVO 2356JK8/2356JK8, BIOS G7ET94WW (2.54 ) 04/30/2013
 0000000000000000 000000002464519d ffff880113655c58 ffffffff817ea4ea
 ffff880113655ca0 ffff880113655c90 ffffffff81095cbd ffff8801372ed150
 ffff8801363456c0 0000000001ffa1f0 ffffea000450c880 ffff88011b3b9078
Call Trace:
 [<ffffffff817ea4ea>] dump_stack+0x4d/0x66
 [<ffffffff81095cbd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff81095d3c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffff814006d4>] debug_dma_assert_idle+0x1a4/0x220
 [<ffffffff811e28b5>] do_wp_page+0xe5/0x960
 [<ffffffff811e5e44>] handle_mm_fault+0x924/0x1110
 [<ffffffff817f7c9c>] ? __do_page_fault+0x16c/0x600
 [<ffffffff817f7d06>] __do_page_fault+0x1d6/0x600
 [<ffffffff810addfb>] ? __set_current_blocked+0x2b/0x50
 [<ffffffff810f951d>] ? trace_hardirqs_on+0xd/0x10
 [<ffffffff817f2e2c>] ? _raw_spin_unlock_irq+0x2c/0x40
 [<ffffffff817f8152>] do_page_fault+0x22/0x30
 [<ffffffff817f3ef8>] page_fault+0x28/0x30
---[ end trace 301c1ffd35eb28d9 ]---
Mapped at:
 [<ffffffff813feca2>] debug_dma_map_sg+0x52/0x190
 [<ffffffffa0177eeb>] i915_gem_gtt_prepare_object+0xdb/0x110 [i915]
 [<ffffffffa017f05d>] i915_gem_object_pin+0x42d/0x780 [i915]
 [<ffffffffa0181a5f>] i915_gem_fault+0x2ff/0x410 [i915]
 [<ffffffff811e0cfc>] __do_fault+0x4c/0x120

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