I'm not exactly sure why the system is locking up on trial
#2, but mbuff is a sensitive memory buffer. You should check
to make sure that you are properly deallocating the shared
memory block from _both_ user and rtl space with 'mbuff_free'.
-Chuck
On Sat, 3 Feb 2001, Yuhong Ren wrote:
> 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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