warning on device removal

[Dmitry Baryshkov <dbaryshkov@xxxxxxxxx>]

Hi,

I've got the following trace on one of my arm boards when removing
the usb masstorage device:

------------[ cut here ]------------
WARNING: at /home/lumag/tosa-tree/arch/arm/mm/consistent.c:368 dma_free_coherent+0x34/0x248()
Modules linked in:
[<c0028fe4>] (dump_stack+0x0/0x14) from [<c003c810>] (warn_on_slowpath+0x4c/0x84)
[<c003c7c4>] (warn_on_slowpath+0x0/0x84) from [<c0029e54>] (dma_free_coherent+0x34/0x248)
 r6:c48b6000 r5:c48b6000 r4:c3879280
[<c0029e20>] (dma_free_coherent+0x0/0x248) from [<c01ced5c>] (hcd_buffer_free+0x8c/0x94)
[<c01cecd0>] (hcd_buffer_free+0x0/0x94) from [<c01c7e9c>] (hcd_free_coherent+0x74/0x84)
 r5:00001000 r4:c3988d48
[<c01c7e28>] (hcd_free_coherent+0x0/0x84) from [<c01c7f84>] (unmap_urb_for_dma+0xd8/0xe0)
[<c01c7eac>] (unmap_urb_for_dma+0x0/0xe0) from [<c01c8000>] (usb_hcd_giveback_urb+0x74/0x104)
 r5:00000000 r4:c39dded0
[<c01c7f8c>] (usb_hcd_giveback_urb+0x0/0x104) from [<c01daa94>] (finish_urb+0x84/0xb8)
 r6:c39dded0 r5:c3988e40 r4:c3988d48
[<c01daa10>] (finish_urb+0x0/0xb8) from [<c01dab20>] (takeback_td+0x58/0xe4)
 r7:c3988e40 r6:c39dded0 r5:c48b30c0 r4:c3064a28
[<c01daac8>] (takeback_td+0x0/0xe4) from [<c01dabd0>] (dl_done_list+0x24/0x38)
 r7:c48a6000 r6:c3988d48 r5:c3988e40 r4:00000000
[<c01dabac>] (dl_done_list+0x0/0x38) from [<c01de204>] (ohci_irq+0x150/0x1f0)
 r5:c3988e40 r4:c3988d48
[<c01de0b4>] (ohci_irq+0x0/0x1f0) from [<c01c8d38>] (usb_hcd_irq+0xa8/0xbc)
 r8:c07a3788 r7:000000c2 r6:00000000 r5:40000093 r4:c3988d48
[<c01c8c90>] (usb_hcd_irq+0x0/0xbc) from [<c006e304>] (handle_IRQ_event+0x2c/0x70)
 r5:00000000 r4:c39a6168
[<c006e2d8>] (handle_IRQ_event+0x0/0x70) from [<c006f8f0>] (handle_edge_irq+0xf8/0x180)
 r7:c03efb18 r6:c39a6168 r5:000000c2 r4:c03efae8
[<c006f7f8>] (handle_edge_irq+0x0/0x180) from [<c0180250>] (tc6393xb_irq+0x48/0x7c)
 r8:00000004 r7:c3876c80 r6:000000c0 r5:c03efae8 r4:00000002
[<c0180208>] (tc6393xb_irq+0x0/0x7c) from [<c00302a4>] (pxa_gpio_demux_handler+0x94/0xe0)
[<c0030210>] (pxa_gpio_demux_handler+0x0/0xe0) from [<c0024048>] (__exception_text_start+0x48/0x64)
[<c0024000>] (__exception_text_start+0x0/0x64) from [<c0024828>] (__irq_svc+0x48/0xf0)
Exception stack(0xc03ddf48 to 0xc03ddf90)
df40:                   00000001 c03df408 00000000 20000013 c0025e08 c03dc000
df60: c0025e08 c04096e4 a001f7e0 69052d06 a001f6a8 c03ddf9c c03ddf60 c03ddf90
df80: c005f518 c0025e68 20000013 ffffffff
 r6:00000400 r5:f2d00000 r4:ffffffff
[<c0025e08>] (default_idle+0x0/0x6c) from [<c0025cd8>] (cpu_idle+0x3c/0x68)
[<c0025c9c>] (cpu_idle+0x0/0x68) from [<c02ea160>] (rest_init+0x68/0x7c)
 r7:c03e02f8 r6:c00211b4 r5:c0409758 r4:c07a3b18
[<c02ea0f8>] (rest_init+0x0/0x7c) from [<c0008c64>] (start_kernel+0x1c4/0x214)
[<c0008aa0>] (start_kernel+0x0/0x214) from [<a0008034>] (0xa0008034)
 r4:0000397d
---[ end trace ad2893817d978711 ]---

-- 
With best wishes
Dmitry

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