Hi Jan, linux-usb list,
I'm hitting this warning consistently on my Raspberry Pi 3 running kernel
v4.10.1 with some unrelated device tree changes, and a debug print (below).
The device identifies as "GlobeTrotter HSDPA Modem", VID: 0af0, PID: 6971.
The warning triggers consistently on first write access to /dev/ttyHS0 that
ModemManager attempts. The first line in the log is my debug print.
[ 65.004892] dwc2_map_urb_for_dma: setup_dma: f5635066
[ 65.010718] ------------[ cut here ]------------
[ 65.016079] WARNING: CPU: 1 PID: 794 at drivers/usb/dwc2/hcd.c:2631
dwc2_map_urb_for_dma+0x94/0x130
[ 65.025930]
[ 65.028143] CPU: 1 PID: 794 Comm: ModemManager Not tainted
4.10.1-00008-g76809ec3947f-dirty #719
[ 65.037747] Hardware name: Raspberry Pi 3 Model B (DT)
[ 65.043656] task: ffff8000362e3e80 task.stack: ffff80003556c000
[ 65.050359] PC is at dwc2_map_urb_for_dma+0x94/0x130
[ 65.056090] LR is at dwc2_map_urb_for_dma+0x34/0x130
[ 65.061819] pc : [<ffff0000083ff0ac>] lr : [<ffff0000083ff04c>] pstate:
000001c5
[ 65.070018] sp : ffff80003556fa70
[ 65.074080] x29: ffff80003556fa70 x28: 0000000000000005
[ 65.080167] x27: ffff80003563d000 x26: ffff8000350d4600
[ 65.086252] x25: ffff800035686780 x24: 0000000000000002
[ 65.092247] x23: 0000000000000001 x22: 0000000001080020
[ 65.097635] x21: ffff800035425800 x20: 0000000001080020
[ 65.103024] x19: ffff800035b72400 x18: 0000000000000010
[ 65.108413] x17: 0000ffff908f5a40 x16: ffff0000081abad8
[ 65.113801] x15: 0000000000000006 x14: ffff00008882c047
[ 65.119191] x13: ffff00000882c055 x12: ffff00000882e458
[ 65.124579] x11: ffff80003556f7d0 x10: ffff0000087c9a38
[ 65.129968] x9 : ffff0000083613e0 x8 : 363566203a616d64
[ 65.135356] x7 : 5f7075746573203a x6 : 00000000000002fc
[ 65.140744] x5 : 0000000000000000 x4 : 0000000000000000
[ 65.146132] x3 : 0000000000000000 x2 : ffff8000362e3e80
[ 65.151521] x1 : 0000000000000001 x0 : ffff00000880e000
[ 65.156907]
[ 65.158414] ---[ end trace a78d20eaecac455a ]---
[ 65.163093] Call trace:
[ 65.165573] Exception stack(0xffff80003556f8a0 to 0xffff80003556f9d0)
[ 65.172108] f8a0: ffff800035b72400 0001000000000000 ffff80003556fa70
ffff0000083ff0ac
[ 65.180052] f8c0: ffff0000086f8f70 ffff000008795000 ffff00000882dce8
ffff0000087fb318
[ 65.187996] f8e0: ffff00000882c048 000000010882bae8 ffff80003556f990
ffff0000080dc664
[ 65.195940] f900: ffff800035b72400 0000000001080020 ffff800035425800
0000000001080020
[ 65.203883] f920: 0000000000000001 0000000000000002 ffff800035686780
ffff8000350d4600
[ 65.211827] f940: ffff00000880e000 0000000000000001 ffff8000362e3e80
0000000000000000
[ 65.219771] f960: 0000000000000000 0000000000000000 00000000000002fc
5f7075746573203a
[ 65.227715] f980: 363566203a616d64 ffff0000083613e0 ffff0000087c9a38
ffff80003556f7d0
[ 65.235659] f9a0: ffff00000882e458 ffff00000882c055 ffff00008882c047
0000000000000006
[ 65.243601] f9c0: ffff0000081abad8 0000ffff908f5a40
[ 65.248548] [<ffff0000083ff0ac>] dwc2_map_urb_for_dma+0x94/0x130
[ 65.254643] [<ffff0000083e8984>] usb_hcd_submit_urb+0x8c/0x8c0
[ 65.260560] [<ffff0000083eb0b8>] usb_submit_urb+0x248/0x480
[ 65.266215] [<ffff0000083d2d2c>] mux_device_request+0xdc/0x1f8
[ 65.272134] [<ffff0000083d2e70>] hso_mux_serial_write_data+0x28/0x38
[ 65.278581] [<ffff0000083d2fa8>] hso_kick_transmit+0x88/0xb8
[ 65.284323] [<ffff0000083d4dc8>] hso_serial_write+0x60/0xc0
[ 65.289979] [<ffff000008345e80>] n_tty_write+0x300/0x3e0
[ 65.295369] [<ffff000008340a50>] tty_write+0x170/0x2b8
[ 65.300585] [<ffff0000081ab6ac>] __vfs_write+0x1c/0x100
[ 65.305884] [<ffff0000081ab92c>] vfs_write+0x9c/0x1a8
[ 65.311010] [<ffff0000081abb1c>] SyS_write+0x44/0xa0
[ 65.316049] [<ffff000008082730>] el0_svc_naked+0x24/0x28
The debug print otherwise just shows:
[ 64.476785] dwc2_map_urb_for_dma: setup_dma: 00000000
So it looks like urb->setup_dma content is garbage.
Any thoughts?
Thanks,
baruch
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
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