System Hang up When pluging out wireless card

Yulang,

Can you try this on the DM816x TI EVM with the latest linux kernel available at the below link. Do you observe the same issue?

arago-project.org/.../projects;a=shortlog;h=refs/heads/ti81xx-master

BR
Pavel

Thanks Pavel for your reply. I have tried the latest kernel, but the issue is still there.

zhaoyl@UbuntuWS1:~/disk2/source/linux/linux-omap3$ git branch
  master
* ti81xx-master
zhaoyl@UbuntuWS1:~/disk2/source/linux/linux-omap3$ git log | head
commit 4f1fb3bea4cc381c76e8e439f8af393c1a698dfc
Author: Sriramakrishnan A G <srk@ti.com>
Date:   Wed Oct 16 13:19:48 2013 +0530

    net/cpsw : acknowledge any pending interrupts on driver close

    Signed-off-by: Sriramakrishnan A G <srk@ti.com>

commit d083cdae102926d4b063ff5655b1d56b3d8576cb
Author: Sebastian Siewior <bigeasy@linutronix.de>

and in the test, I " cat /proc/driver/musb_hdrc.1", I hope it may be helpful.

/home/kylin # uname -a
Linux (none) 2.6.37+ #1 Thu Feb 5 17:13:31 CST 2015 armv7l GNU/Linux
/home/kylin # echo 9 9 9 9 > /proc/sys/kernel/printk
/home/kylin # modprobe rt2800usb
usbcore: registered new interface driver rt2800usb
/home/kylin # hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
hub 2-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
usb 2-1: new high speed USB device using musb-hdrc and address 2
usb 2-1: default language 0x0409
usb 2-1: udev 2, busnum 2, minor = 129
usb 2-1: New USB device found, idVendor=7392, idProduct=7711
usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-1: Product: 802.11 n WLAN
usb 2-1: Manufacturer: Ralink
usb 2-1: SerialNumber: 1.0
usb 2-1: usb_probe_device
usb 2-1: configuration #1 chosen from 1 choice
usb 2-1: adding 2-1:1.0 (config #1, interface 0)
rt2800usb 2-1:1.0: usb_probe_interface
rt2800usb 2-1:1.0: usb_probe_interface - got id
phy0 -> rt2x00_set_chip: Info - Chipset detected - rt: 3070, rf: 0005, rev: 0200.
ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
Registered led device: rt2800usb-phy0::radio
Registered led device: rt2800usb-phy0::assoc
Registered led device: rt2800usb-phy0::quality
drivers/usb/core/inode.c: creating file '002'
hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
hub 2-0:1.0: port 1 enable change, status 00000503

/home/kylin # ifconfig
/home/kylin # cat /proc/driver/musb_hdrc.1
Status: MHDRC, Mode=Host (Power=f0, DevCtl=5d)
OTG state: a_host; active
Options: ?dma?, host, debug=0 [eps=16]
Root port status: 00000503
CPPI: txcr=0 txsrc=0 txena=0; rxcr=0 rxsrc=280de80 rxena=0
/home/kylin # ifconfig wlan0 up
phy0 -> rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin'.
phy0 -> rt2x00lib_request_firmware: Info - Firmware detected - version: 0.29.
phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 0 - CWmin: 3, CWmax: 4, Aifs: 2, TXop: 102.
phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 1 - CWmin: 4, CWmax: 5, Aifs: 2, TXop: 188.
phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 2 - CWmin: 5, CWmax: 10, Aifs: 3, TXop: 0.
phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 3 - CWmin: 5, CWmax: 10, Aifs: 7, TXop: 0.
/home/kylin # ifconfig
wlan0     Link encap:Ethernet  HWaddr 00:1F:1F:4A:B8:44
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/home/kylin # cat /proc/driver/musb_hdrc.1
Status: MHDRC, Mode=Host (Power=f0, DevCtl=5d)
OTG state: a_host; active
Options: ?dma?, host, debug=0 [eps=16]
Root port status: 00000503
CPPI: txcr=0 txsrc=0 txena=0; rxcr=0 rxsrc=280de80 rxena=0

RX2: 1buf rxcsr 2020 interval 00 max 0200 type 61; dev 2 hub 0 port 0
    rx dma1: 270926084 left,00000000 00000000, 00000000 00000000; 00000000 00000000 00000000 .. 00000000
    qh d2812700 dev2 ep1-bulk max512
        in urb d33bb500 0/3860
        in urb d33bb100 0/3860
        in urb d3398c00 0/3860
        in urb d3398b80 0/3860
        in urb d3398f00 0/3860
        in urb d3398d80 0/3860
        in urb d33eeb00 0/3860
        in urb d33eef00 0/3860
        in urb d33eed80 0/3860
        in urb d33eec80 0/3860
        in urb d33ee280 0/3860
        in urb d33ee800 0/3860
        in urb d33eee00 0/3860
        in urb d33eec00 0/3860
        in urb d33ee880 0/3860
        in urb d3375e80 0/3860
        in urb d3375f80 0/3860
        in urb d33bbd00 0/3860
        in urb d33bb480 0/3860
        in urb d33bb400 0/3860
        in urb d33bb900 0/3860
        in urb d33bbf00 0/3860
        in urb d33bbe00 0/3860
        in urb d33bbe80 0/3860
/home/kylin # hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
hub 2-0:1.0: port 1, status 0100, change 0001, 12 Mb/s
usb 2-1: USB disconnect, address 2
usb 2-1: unregistering device
usb 2-1: unregistering interface 2-1:1.0
musb-hdrc musb-hdrc.1: shutdown urb d33bb500 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33bb100 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d3398c00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d3398b80 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d3398f00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d3398d80 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33eeb00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33eef00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33eed80 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33eec80 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33ee280 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33ee800 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33eee00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33eec00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33ee880 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d3375e80 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d3375f80 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33bbd00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33bb480 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33bb400 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33bb900 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33bbf00 ep1in-bulk
musb-hdrc musb-hdrc.1: shutdown urb d33bbe00 ep1in-bulk

Have you tried with the DM816x TI EVM?