Re: [patch] block/IDE/interrupt lockup

Manfred Spraul (
Sat, 30 Mar 2002 10:35:08 +0100

> - spin_unlock_irq(&io_request_lock);
> + spin_unlock_irqrestore(&io_request_lock, flags);
> rq = kmem_cache_alloc(request_cachep, SLAB_KERNEL);

Great patch.
kmem_cache_alloc with SLAB_KERNEL can sleep, i.e. you've just converted
an obvious bug into a rare, difficult to find bug. What about trying to
fix it?

I agree that this won't happen during boot, but what about a hotplug PCI
ide controller?


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