by the way, I use the Linux2.6.26
2008-12-04
snoppy1314
发件人： snoppy1314
发送时间： 2008-12-03 21:27:43
收件人： kernelnewbies
抄送：
主题： error when rmmod g_file_storage module
Hi, eveyone:
1. These days I'm trying to make my 2440 board(its CPU is s3c2440) to be
notified as a disk of PC when connecting a usb line.
Now nearly everyone is ok.but when I want to rmmod the g_file_storage
module,error happened.
#rmmod g_file_storage
After I execute the last command, the board is dead, and a few minutes later,
the information below is showed:
INFO: task rmmod:850 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
rmmod D c01f7284 0 850 807
[<c01f7018>] (__sched_text_start+0x0/0x2c0) from [<c01f7814>]
(schedule_timeout+0x24/0xbc)
[<c01f77f0>] (schedule_timeout+0x0/0xbc) from [<c01f73fc>]
(wait_for_common+0x124/0x1bc)
r8:00000880 r7:00000002 r6:c1c8013c r5:7fffffff r4:c1fe5edc
[<c01f72d8>] (wait_for_common+0x0/0x1bc) from [<c01f74ac>]
(wait_for_completion+0x18/0x1c)
r7:c1fe5f48 r6:c1fe4000 r5:00000000 r4:c1c800a0
[<c01f7494>] (wait_for_completion+0x0/0x1c) from [<bf00a8a0>]
(fsg_cleanup+0x44/0x68 [g_file_storage])
[<bf00a85c>] (fsg_cleanup+0x0/0x68 [g_file_storage]) from [<c005cc98>]
(sys_delete_module+0x1a0/0x1f0)
r4:bf00cdc0
[<c005caf8>] (sys_delete_module+0x0/0x1f0) from [<c0024ae0>]
(ret_fast_syscall+0x0/0x2c)
r8:c0024c84 r7:00000081 r6:00098ebe r5:bebc6e84 r4:0000015e
who can help me?Thanks
NOw i know the problem is in the below function:
\drivers\usb\gadget\file_storage.c
static void __exit fsg_cleanup(void)
{
struct fsg_dev *fsg = the_fsg;
/* Unregister the driver iff the thread hasn't already done so */
if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
usb_gadget_unregister_driver(&fsg_driver);
/* Wait for the thread to finish up */
wait_for_completion(&fsg->thread_notifier);
close_all_backing_files(fsg);
kref_put(&fsg->ref, fsg_release);
}
2. what i do is as below:
cd /mnt/yaffs
dd if=/dev/zero of=img bs=1k count=2k
mkdosfs -v -F 16 -n fatdisk img
insmod /mnt/yaffs/sikinzen/s3c2410_udc.ko
insmod /mnt/yaffs/sikinzen/g_file_storage.ko file=img stall=0
removable=1
now connect the usb line between PC and 2440 board , and you will find a disk
in PC
the above two modules is compiled from the Linux source \drivers\usb\gadget
2008-12-03
snoppy1314
