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SubjectRe: segfault when unloading module loop in 2.6.0-test3+ck patches
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Andrew Morton <akpm@osdl.org> writes:

> Peter Osterlund <petero2@telia.com> wrote:
> >
> > diff -puN drivers/block/loop.c~loop-oops-fix drivers/block/loop.c
> > --- linux/drivers/block/loop.c~loop-oops-fix 2003-08-17 19:19:22.000000000 +0200
> > +++ linux-petero/drivers/block/loop.c 2003-08-17 20:33:03.000000000 +0200
> > @@ -1198,6 +1198,7 @@ int __init loop_init(void)
> > lo->lo_queue = blk_alloc_queue(GFP_KERNEL);
> > if (!lo->lo_queue)
> > goto out_mem4;
> > + init_timer(&lo->lo_queue->unplug_timer);
> > disks[i]->queue = lo->lo_queue;
> > init_MUTEX(&lo->lo_ctl_mutex);
> > init_MUTEX_LOCKED(&lo->lo_sem);
>
> This bit should be done in ll_rw_blk.c somewhere. Are you sure it is
> necessary for loop?

Without this, if I insmod loop and then immediately rmmod loop,
del_timer() calls check_timer_failed(), which generates warnings in
the kernel log.

In normal cases, the timer is initialized in blk_queue_make_request(),
but that function is not called if you don't use the loop device
before unloading the module. Maybe there is a better way to get rid of
this warning.

--
Peter Osterlund - petero2@telia.com
http://w1.894.telia.com/~u89404340
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