uhci_hcd: DMA-API: cpu touching an active dma mapped cacheline

[Dave Jones]

WARNING: CPU: 3 PID: 25477 at lib/dma-debug.c:593 debug_dma_assert_idle+0x1ba/0x223()
uhci_hcd 0000:00:1d.2: DMA-API: cpu touching an active dma mapped cacheline [cln=0x0000000002355f80]
Modules linked in: fuse tun l2tp_ppp l2tp_netlink l2tp_core can_raw can_bcm scsi_transport_iscsi nfc caif_socket caif af_802154 phonet af_rxrpc hidp bluetooth 6lowpan_iphc can pppoe pppox ppp_generic slhc irda crc_ccitt rds rose x25 atm netrom appletalk ipx p8023 p8022 psnap llc ax25 cfg80211 rfkill nouveau video backlight mxm_wmi wmi i2c_algo_bit ttm drm_kms_helper drm tg3 i2c_core ptp pps_core libphy kvm_intel kvm lpc_ich microcode pcspkr mfd_core parport_pc serio_raw parport shpchp rtc_cmos xfs libcrc32c raid0 floppy
CPU: 3 PID: 25477 Comm: cc Not tainted 3.14.0-rc5+ #2 
Hardware name: Dell Inc.                 Precision WorkStation 490    /0DT031, BIOS A08 04/25/2008
 00000000 2e7036e5 00000000 db851dbc c15f76ee db851dfc db851dec c1043733
 c17ce4b0 db851e1c 00006385 c17ccc7a 00000251 c130a152 c130a152 eef3f650
 efb53480 00000000 db851e08 c1043788 00000009 db851dfc c17ce4b0 db851e1c
Call Trace:
 [<c15f76ee>] dump_stack+0x4b/0x75
 [<c1043733>] warn_slowpath_common+0x7e/0x95
 [<c130a152>] ? debug_dma_assert_idle+0x1ba/0x223
 [<c130a152>] ? debug_dma_assert_idle+0x1ba/0x223
 [<c1043788>] warn_slowpath_fmt+0x3e/0x51
 [<c130a152>] debug_dma_assert_idle+0x1ba/0x223
 [<c1159704>] do_wp_page+0x108/0x8a1
 [<c115b790>] ? handle_mm_fault+0x1ba/0xd54
 [<c15ff7ea>] ? _raw_spin_lock+0x6b/0x72
 [<c115bae2>] handle_mm_fault+0x50c/0xd54
 [<c160357c>] ? __do_page_fault+0xee/0x55c
 [<c16035da>] __do_page_fault+0x14c/0x55c
 [<c16039ea>] ? __do_page_fault+0x55c/0x55c
 [<c16039f7>] do_page_fault+0xd/0xf
 [<c1600dfc>] error_code+0x6c/0x74
------------[ cut here ]------------
WARNING: CPU: 3 PID: 25490 at lib/dma-debug.c:593 debug_dma_assert_idle+0x1ba/0x223()
uhci_hcd 0000:00:1d.2: DMA-API: cpu touching an active dma mapped cacheline [cln=0x0000000002355f80]
---[ end trace 3ac75acf24cf0b9e ]---
Mapped at:
 [<c13081b5>] debug_dma_alloc_coherent+0x2b/0xc3
Modules linked in: fuse tun l2tp_ppp l2tp_netlink l2tp_core can_raw can_bcm scsi_transport_iscsi nfc caif_socket caif af_802154 phonet af_rxrpc hidp bluetooth 6lowpan_iphc can pppoe pppox ppp_generic slhc irda crc_ccitt rds rose x25 atm netrom appletalk ipx p8023 p8022 psnap llc ax25 cfg80211 rfkill nouveau video backlight mxm_wmi wmi i2c_algo_bit ttm drm_kms_helper drm tg3 i2c_core ptp pps_core libphy kvm_intel kvm lpc_ich microcode pcspkr mfd_core parport_pc serio_raw parport shpchp rtc_cmos xfs libcrc32c raid0 floppy
 
[<c116fcee>] dma_pool_alloc+0x14f/0x2fd
 [<c1456eaa>] uhci_alloc_td.isra.35+0x24/0x60
 [<c1457fa6>] uhci_start+0x272/0x56b
 [<c142d8fb>] usb_add_hcd+0x252/0x774

CPU: 3 PID: 25490 Comm: cc Tainted: G        W    3.14.0-rc5+ #2 
Hardware name: Dell Inc.                 Precision WorkStation 490    /0DT031, BIOS A08 04/25/2008
 00000000 bf79585b 00000000 db81bdbc c15f76ee db81bdfc db81bdec c1043733
 c17ce4b0 db81be1c 00006392 c17ccc7a 00000251 c130a152 c130a152 eef3f650
 efb53480 00000000 db81be08 c1043788 00000009 db81bdfc c17ce4b0 db81be1c
Call Trace:
 [<c15f76ee>] dump_stack+0x4b/0x75
 [<c1043733>] warn_slowpath_common+0x7e/0x95
 [<c130a152>] ? debug_dma_assert_idle+0x1ba/0x223
 [<c130a152>] ? debug_dma_assert_idle+0x1ba/0x223
 [<c1043788>] warn_slowpath_fmt+0x3e/0x51
 [<c130a152>] debug_dma_assert_idle+0x1ba/0x223
 [<c1159704>] do_wp_page+0x108/0x8a1
 [<c115b790>] ? handle_mm_fault+0x1ba/0xd54
 [<c15ff7ea>] ? _raw_spin_lock+0x6b/0x72
 [<c115bae2>] handle_mm_fault+0x50c/0xd54
 [<c160357c>] ? __do_page_fault+0xee/0x55c
 [<c16035da>] __do_page_fault+0x14c/0x55c
 [<c1603683>] ? __do_page_fault+0x1f5/0x55c
 [<c160065b>] ? restore_all+0xf/0xf
 [<c12f0d89>] ? __put_user_4+0x11/0x18
 [<c16039ea>] ? __do_page_fault+0x55c/0x55c
 [<c16039f7>] do_page_fault+0xd/0xf
 [<c1600dfc>] error_code+0x6c/0x74
---[ end trace 3ac75acf24cf0b9f ]---
Mapped at:
 [<c13081b5>] debug_dma_alloc_coherent+0x2b/0xc3
 [<c116fcee>] dma_pool_alloc+0x14f/0x2fd
 [<c1456eaa>] uhci_alloc_td.isra.35+0x24/0x60
 [<c1457fa6>] uhci_start+0x272/0x56b
 [<c142d8fb>] usb_add_hcd+0x252/0x774
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