Messages in this thread | | | From | Ballabio_Dario@emc ... | Subject | RE: eata irq abuse (was: Re: Linux 2.5.60) | Date | Wed, 12 Feb 2003 05:08:07 -0500 |
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Yes, you are correct. I used spin_unlock in order to release the local driver lock during the scsi_register call, but I forgot that I had the irq disabled as well. SO the correct fix is to use spin_unlock_irq/spin_lock_irq around the scsi_register call. Same fix applies to the u14-34f driver.
Cheers,
********************************* Ph.D. Dario Ballabio EMC Computer Systems Italia spa Mobile phone +393487978851 Office phone +390244571315 Mobile fax +393487951622
*** Si vis pacem, para bellum ***
-----Original Message----- From: Manfred Spraul [mailto:manfred@colorfullife.com] Sent: Tuesday, February 11, 2003 6:46 PM To: Zephaniah E. Hull Cc: linux-kernel@vger.kernel.org; linux-scsi@vger.kernel.org; linux-eata@i-connect.net Subject: eata irq abuse (was: Re: Linux 2.5.60)
Zephaniah wrote:
>kernel BUG at mm/slab.c:1102!
Slab notices that a function that expects enabled local interrupts is called with disabled local interrupts.
>Call Trace: > [<c014a3b3>] do_tune_cpucache+0x83/0x240
do_tune_cpucache: the function call smp_call_function(), and that is only permitted with enabled local interrupts. The complain is correct.
> [<c014a300>] do_ccpupdate_local+0x0/0x30 > [<c014a5c1>] enable_cpucache+0x51/0x80 > [<c0148ea5>] kmem_cache_create+0x4a5/0x560
Within kmem_cache_create. kmem_cache_create checks for in_interrupt(), thus someone probably does
spin_lock_irqsave(); kmem_cache_create();
> [<c0285dd2>] scsi_setup_command_freelist+0xa2/0x130
calls kmem_cache_create()
> [<c02887e0>] scsi_register+0x3c0/0x660
calls scsi_setup_command_freelist
> [<c02919a1>] get_pci_dev+0x31/0x50
?? probably stale
> [<c0291df2>] port_detect+0x3c2/0xe50
Do you have an eata scsi controller?
Ugs. eata2x_detect(): * spin_lock_irqsave(); * calls port_detect(); * * spin_unlock(); * * scsi_register.
Eata maintainers: Is that necessary? Why do the interrupts remain disabled across scsi_register? Is that a bug workaround, or an oversight? I'd use
spin_unlock_irq(); scsi_register(); spin_lock_irq();
-- Manfred
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