Dear Tomasz,
I allocated one shared memory within both the user space and kernel
modules to pass some user command to kernel using RT Linux. The problem
now is that after I "rmmod" my kernel module, I wish to "rmmod mbuff"
also, but I could not, the info of "lsmod" is as follows after I removed
my kernel module:
------------------------
Module Size Used by
mbuff 4092 2
rtl_fifo 5876 0
rtl_posixio 6732 0 [rtl_fifo]
rtl_sched 4480 0 [iobs1 rtl_posixio]
rtl_time 4096 0 [iobs1 rtl_sched]
------------------
When I "rmmod mbuff", it tells me that:
mbuff: Device or resource busy .
But who is using it now? Most worse, when I try to insmod my module
kernel again, the computer will freeze. I am puzzled with this.
My kernel version is :
Linux version 2.2.13-RTL2.0 (root@ryh) (gcc version egcs-2.91.66
19990314/Linux (egcs-1.1.2 release))
The MBuff version is:
mbuff: kernel shared memory driver v0.6.1
mbuff: (C) Tomasz Motylewski et al., GPL
mbuff: registered as MISC device minor 254
Thank you for your kind assistance.
Kind regards,
Yuhong
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