Hi, I confirmed this is due to dma_free_coherent after an xfer transfer complete. Do you know if this is fixed in a release after 2.6.27 ? Thanks, Herve. >-----Original Message----- >From: Patriarche, Herve >Sent: Friday, September 17, 2010 10:11 AM >To: Ming Lei >Cc: linux-usb >Subject: RE: USB: free coherent buffer into atomic context > >Hi Lei Ming, > >I confirmed, HCD_LOCAL_MEM flag is on. >I sometimes get a reset before the WARN so perhaps it is the >root cause, I will check. > >root@MM6_160117:/# >root@MM6_160117:/# usb 1-1: new high speed USB device using >oxu210hp-ehci and address 3 usb 1-1: New USB device found, >idVendor=1307, idProduct=0165 usb 1-1: New USB device strings: >Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: USB Mass >Storage Device usb 1-1: Manufacturer: USBest Technology usb >1-1: SerialNumber: 000000000000B0 usb 1-1: configuration #1 >chosen from 1 choice >scsi2 : SCSI emulation for USB Mass Storage devices >scsi 2:0:0:0: Direct-Access 2009-07-22 0.00 >PQ: 0 ANSI: 2 >sd 2:0:0:0: [sdb] 7897088 512-byte hardware sectors (4043 MB) >sd 2:0:0:0: [sdb] Write Protect is off sd 2:0:0:0: [sdb] >Assuming drive cache: write through usb 1-1: reset high speed >USB device using oxu210hp-ehci and address 3 sd 2:0:0:0: [sdb] >7897088 512-byte hardware sectors (4043 MB) sd 2:0:0:0: [sdb] >Write Protect is off sd 2:0:0:0: [sdb] Assuming drive cache: >write through sdb:<4>------------[ cut here ]------------ >WARNING: at >/data/cubic/wks/Cubic_ltt/build/linux/arch/arm/mm/consistent.c: >368 dma_free_coherent+0x2e8/0x354() Modules linked in: >cfbfillrect cfbimgblt cfbcopyarea pxafb slhc ppp_generic >crc_ccitt ppp_async usbserial sierra [<c02b7b10>] >(dump_stack+0x0/0x14) from [<c003dae0>] >(warn_on_slowpath+0x4c/0x84) [<c003da94>] >(warn_on_slowpath+0x0/0x84) from [<c002ae6c>] >(dma_free_coherent+0x2e8/0x354) > r6:00001004 r5:c0361700 r4:d0886000 >[<c002ab84>] (dma_free_coherent+0x0/0x354) from [<c02098b0>] >(hcd_buffer_free+0x5c/0x98) [<c0209854>] >(hcd_buffer_free+0x0/0x98) from [<c02032b8>] >(hcd_free_coherent+0x64/0x8c) r5:d0886000 r4:cf905400 >[<c0203254>] (hcd_free_coherent+0x0/0x8c) from [<c02033c4>] >(unmap_urb_for_dma+0xe4/0xe8) [<c02032e0>] >(unmap_urb_for_dma+0x0/0xe8) from [<c0203408>] >(usb_hcd_giveback_urb+0x40/0xd0) r5:00000000 r4:cfad1e80 >[<c02033c8>] (usb_hcd_giveback_urb+0x0/0xd0) from [<c0211dd4>] >(ehci_urb_done+0xac/0x12c) r5:00000000 r4:cf905400 >[<c0211d28>] (ehci_urb_done+0x0/0x12c) from [<c0212ae8>] >(qh_completions+0x3d0/0x458) r9:cf9054c0 r8:d0880180 >r7:ffffff8d r6:ffffff8d r5:d08810c0 r4:d08810c0 [<c0212718>] >(qh_completions+0x0/0x458) from [<c0215538>] >(ehci_work+0xa4/0xa60) [<c0215494>] (ehci_work+0x0/0xa60) from >[<c02169cc>] (ehci_irq+0x1d4/0x1f4) [<c02167f8>] >(ehci_irq+0x0/0x1f4) from [<c02031ec>] (usb_hcd_irq+0x44/0xac) >[<c02031a8>] (usb_hcd_irq+0x0/0xac) from [<c006beac>] >(handle_IRQ_event+0xbc/0x190) r5:00000000 r4:cf9e3220 >[<c006bdf0>] (handle_IRQ_event+0x0/0x190) from [<c006d5f4>] >(handle_edge_irq+0xe4/0x1dc) > r9:c0379a94 r8:c03be09c r7:00000073 r6:cf9e3220 r5:c0365304 >r4:c035a000 [<c006d510>] (handle_edge_irq+0x0/0x1dc) from >[<c002f07c>] (pxa_gpio_demux_handler+0xa8/0xd8) > r9:c0379a94 r8:c035bee0 r7:c03639dc r6:f6e00000 r5:00000000 >r4:00000033 >[<c002efd4>] (pxa_gpio_demux_handler+0x0/0xd8) from >[<c0023044>] (__exception_text_start+0x44/0x5c) >[<c0023000>] (__exception_text_start+0x0/0x5c) from >[<c00239a4>] (__irq_svc+0x44/0xe4) Exception stack(0xc035bf40 >to 0xc035bf88) >bf40: 00000001 cf8e3200 00000000 60000013 c0025620 c035a000 >c0025620 c03798e4 >bf60: a001b5e4 69056827 a001b5b0 c035bf94 c035bf98 c035bf88 >c0025678 c0025684 >bf80: 60000013 ffffffff > r7:00000002 r6:00000400 r5:c035bf74 r4:ffffffff [<c0025620>] >(default_idle+0x0/0x6c) from [<c00255ec>] (cpu_idle+0x48/0x7c) >[<c00255a4>] (cpu_idle+0x0/0x7c) from [<c02b6038>] >(rest_init+0x74/0x88) > r7:c035e538 r6:c001cdb0 r5:c03798a0 r4:c035a000 [<c02b5fc4>] >(rest_init+0x0/0x88) from [<c0008984>] >(start_kernel+0x228/0x29c) r5:c03798a0 r4:c03be5e0 >[<c000875c>] (start_kernel+0x0/0x29c) from [<a0008034>] >(0xa0008034) ---[ end trace 0ab00bbccf43493d ]--- > >sd 2:0:0:0: [sdb] Attached SCSI removable disk > >Thanks, Herve. > > >>-----Original Message----- >>From: Ming Lei [mailto:tom.leiming@xxxxxxxxx] >>Sent: Friday, September 17, 2010 6:09 AM >>To: Patriarche, Herve >>Cc: linux-usb >>Subject: Re: USB: free coherent buffer into atomic context >> >>CC linux-usb >> >>2010/9/17 Patriarche, Herve <herve.patriarche@xxxxxxxxxxxxx>: >>> Hi Tom, >>> >>> I am currently working on a quasi EHCI driver on linux 2.6.27 and I >>> currently got similar Warning as you get into usb test : >>> http://www.spinics.net/lists/linux-usb/msg34223.html >>> I wonder if you have any advice to fix it ? >> >>I guess your ehci driver may have the flag HCD_LOCAL_MEM set. >>Could you confirm this? >> >>There is really a issue in hcd of usbcore, which may cause >the warning >>if the flag HCD_LOCAL_MEM is set. >> >>> >>> , Member of Technical Staff, Wind River >>> >>> direct +33 4 76 23 45 94 mobile +33 6 70 23 10 68 fax >>+33 4 76 >>> 23 45 >>> 99 >>> >>> >>> >>> >>> root@MM6_160117:/# usb 1-1: new high speed USB device using >>> oxu210hp-ehci and address 2 usb 1-1: New USB device found, >>> idVendor=07ab, idProduct=fcf6 usb 1-1: New USB device >>strings: Mfr=1, >>> Product=2, SerialNumber=3 usb 1-1: Product: DataBar USB2.0 usb 1-1: >>> Manufacturer: Freecom usb 1-1: SerialNumber: 905708280446 usb 1-1: >>> configuration #1 chosen from 1 choice scsi0 : SCSI >emulation for USB >>> Mass Storage devices scsi 0:0:0:0: Direct-Access Freecom >> DataBar >>> USB2.0 1100 PQ: 0 ANSI: 0 CCS sd 0:0:0:0: [sda] 1957888 512-byte >>> hardware sectors (1002 MB) sd 0:0:0:0: [sda] Write Protect is off sd >>> 0:0:0:0: [sda] Assuming drive cache: write through usb 1-1: >>reset high >>> speed USB device using oxu210hp-ehci and address 2 sd 0:0:0:0: [sda] >>> 1957888 512-byte hardware sectors (1002 MB) sd 0:0:0:0: [sda] Write >>> Protect is off sd 0:0:0:0: [sda] Assuming drive cache: write through >>> sda:<4>------------[ cut here ]------------ >>> WARNING: at >>> /data/cubic/wks/Cubic_ltt/build/linux/arch/arm/mm/consistent.c:368 >>> dma_free_coherent+0x2e8/0x354() >>> Modules linked in: cfbfillrect cfbimgblt cfbcopyarea pxafb slhc >>> ppp_generic crc_ccitt ppp_async usbserial sierra [<c02b7ad4>] >>> (dump_stack+0x0/0x14) from [<c003dae0>] >>> (warn_on_slowpath+0x4c/0x84) >>> [<c003da94>] (warn_on_slowpath+0x0/0x84) from [<c002ae6c>] >>> (dma_free_coherent+0x2e8/0x354) >>> r6:00001004 r5:c0361700 r4:d0886000 >>> [<c002ab84>] (dma_free_coherent+0x0/0x354) from [<c0209874>] >>> (hcd_buffer_free+0x5c/0x98) >>> [<c0209818>] (hcd_buffer_free+0x0/0x98) from [<c02032b8>] >>> (hcd_free_coherent+0x64/0x8c) >>> r5:d0886000 r4:cf905400 >>> [<c0203254>] (hcd_free_coherent+0x0/0x8c) from [<c02033c4>] >>> (unmap_urb_for_dma+0xe4/0xe8) >>> [<c02032e0>] (unmap_urb_for_dma+0x0/0xe8) from [<c0203408>] >>> (usb_hcd_giveback_urb+0x40/0xd0) >>> r5:00000000 r4:cf9fd480 >>> [<c02033c8>] (usb_hcd_giveback_urb+0x0/0xd0) from [<c0211d98>] >>> (ehci_urb_done+0xac/0x12c) >>> r5:00000000 r4:cf905400 >>> [<c0211cec>] (ehci_urb_done+0x0/0x12c) from [<c0212aac>] >>> (qh_completions+0x3d0/0x458) >>> r9:cf9054c0 r8:d0880180 r7:ffffff8d r6:ffffff8d r5:d0881240 >>> r4:d0881240 [<c02126dc>] (qh_completions+0x0/0x458) from >[<c02154fc>] >>> (ehci_work+0xa4/0xa60) >>> [<c0215458>] (ehci_work+0x0/0xa60) from [<c0216990>] >>> (ehci_irq+0x1d4/0x1f4) [<c02167bc>] (ehci_irq+0x0/0x1f4) from >>> [<c02031ec>] (usb_hcd_irq+0x44/0xac) [<c02031a8>] >>> (usb_hcd_irq+0x0/0xac) from [<c006beac>] >>> (handle_IRQ_event+0xbc/0x190) >>> r5:00000000 r4:cf9e3220 >>> [<c006bdf0>] (handle_IRQ_event+0x0/0x190) from [<c006d5f4>] >>> (handle_edge_irq+0xe4/0x1dc) >>> r9:c0379a94 r8:c03be09c r7:00000073 r6:cf9e3220 r5:c0365304 >>> r4:cfaee000 [<c006d510>] (handle_edge_irq+0x0/0x1dc) from >>[<c002f07c>] >>> (pxa_gpio_demux_handler+0xa8/0xd8) >>> r9:c0379a94 r8:cfaeff50 r7:c03639dc r6:f6e00000 r5:00000000 >>> r4:00000033 >>> [<c002efd4>] (pxa_gpio_demux_handler+0x0/0xd8) from [<c0023044>] >>> (__exception_text_start+0x44/0x5c) >>> [<c0023000>] (__exception_text_start+0x0/0x5c) from [<c0023bec>] >>> (__irq_usr+0x4c/0xe0) >>> Exception stack(0xcfaeffb0 to 0xcfaefff8) >>> ffa0: 00000006 2a00d792 00000006 >>> 2a00d792 >>> ffc0: 00000190 00000000 2a012f48 00000000 2a010228 2a014c48 >00000000 >>> 000000be >>> ffe0: 2a010374 bef95618 2a0025e0 400e7fd0 20000010 ffffffff >>> r7:00000001 r6:00000400 r5:00000000 r4:ffffffff ---[ end trace >>> fa47280d47db3eae ]--- >>> sda1 >>> sd 0:0:0:0: [sda] Attached SCSI removable disk >> >> >> >>-- >>Lei Ming >> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
