Hai all,

We interfaced the MRF24J40 cape to BeagleBoneBlack. We are able to probe 
the radio driver.

In order to make the wpan interface we did the following commands:
1. iz add wpan-phy0
2. ip link set set wpan0 address a0:0:0:0:0:0:0:0
3. ifconfig wpan0 up

Here the ssh session halts. We are able to open another ssh session.
When i see the dmesg the o/p:

[11400.596033] INFO: task ifconfig:375 blocked for more than 300 seconds.
[11400.602950]       Not tainted 3.12.9-00108-ge9d1644 #1
[11400.608350] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" 
disables this message.
[11400.616567] ifconfig        D c050d824     0   375    364 0x00000000
[11400.616627] [<c050d824>] (__schedule+0x5d0/0x694) from [<c050dec8>] 
(schedule_preempt_disabled+0xc/0x10)
[11400.616645] [<c050dec8>] (schedule_preempt_disabled+0xc/0x10) from 
[<c050c9cc>] (__mutex_lock_slowpath+0x1d4/0x320)
[11400.616661] [<c050c9cc>] (__mutex_lock_slowpath+0x1d4/0x320) from 
[<c050cb2c>] (mutex_lock+0x14/0x2c)
[11400.616693] [<c050cb2c>] (mutex_lock+0x14/0x2c) from [<bf1181ac>] 
(read_short_reg+0x68/0xc8 [mrf24j40])
[11400.616723] [<bf1181ac>] (read_short_reg+0x68/0xc8 [mrf24j40]) from 
[<bf1184dc>] (mrf24j40_start+0x18/0x40 [mrf24j40])
[11400.616757] [<bf1184dc>] (mrf24j40_start+0x18/0x40 [mrf24j40]) from 
[<bf10a458>] (mac802154_slave_open+0x30/0xac [mac802154])
[11400.616790] [<bf10a458>] (mac802154_slave_open+0x30/0xac [mac802154]) 
from [<c0456e5c>] (__dev_open+0xa0/0xfc)
[11400.616809] [<c0456e5c>] (__dev_open+0xa0/0xfc) from [<c0457078>] 
(__dev_change_flags+0x8c/0x118)
[11400.616826] [<c0457078>] (__dev_change_flags+0x8c/0x118) from 
[<c0457178>] (dev_change_flags+0x10/0x44)
[11400.616846] [<c0457178>] (dev_change_flags+0x10/0x44) from 
[<c04ad8e4>] (devinet_ioctl+0x2bc/0x624)
[11400.616865] [<c04ad8e4>] (devinet_ioctl+0x2bc/0x624) from 
[<c0440b10>] (sock_ioctl+0x220/0x270)
[11400.616892] [<c0440b10>] (sock_ioctl+0x220/0x270) from [<c00f7820>] 
(do_vfs_ioctl+0x544/0x5b8)
[11400.616911] [<c00f7820>] (do_vfs_ioctl+0x544/0x5b8) from [<c00f78e4>] 
(SyS_ioctl+0x50/0x6c)


What can be the reason. Any help ?

Thanks in advance,

-Varka Bhadram,
C-DAC

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