Messages in this thread | | | Date | Tue, 28 Oct 2003 17:45:17 -0800 (PST) | From | Amit Patel <> | Subject | Re: as_arq scheduler alloc with 2.6.0-test8-mm1 |
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Hi
After doing some printk debugging looks like for each block device we allocate elevator structure. But during cleanup the elevator->elevator_data is never freed. In printk I put printk in as-iosched.c:as_alloc where I see elevator_data is allocated from as_arq pool and it should have been freed as a part of block device cleanup through elevator_release function. I never see it coming to elevatore_release function.
I will try to walk through code some more and see if I can figure out who was supposed to call elevator_release as part of cleanup. Let me know if I am going on wrong track here.
Thanks Amit --- Nick Piggin <piggin@cyberone.com.au> wrote: > > > Mr Amit Patel wrote: > > >Hi Andrew, > > > >The qlogic driver is for Fibre Channel HBA QLA2342. > >This is a beta driver which is part of the mjb1 > patch > >against 2.6.0-test8. As a part of driver insmod, > >driver tries to find fiber channel device and maps > it > >to scsi block device. Actually I don't have any > fibre > >channel target attached, so driver does not find > any > >scsi devices and discovery finishes without adding > any > >block device. > > > >I am trying to go through driver scsi_scan process > and > >see when does actual allocation from as_arq > happens. > >But for some reason after going to kgdb I get > SIGEMT > >and I cannot debug further. What is causing SIGEMT > >cause after doing some search looks like its > actually > >SIGUSR but linux treats it as SIGEMT. Is there any > way > >to prevent SIGEMT when I want to use kgdb ? > > > >Thanks for your help, > > > > Hi Amit, > > I'm a little bit busy to look at this now, however > someone > is looking into all these refcounting problems. > > If you would like to narrow it down a bit, check > that the > request queues that are allocated are all released > when the > driver is unloaded (drivers/block/ll_rw_blk.c > blk_alloc_queue > and blk_cleanup_queue). Just stick a couple of > printks there > if your debugger isn't working. > >
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