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Date: Mon, 31 Jul 2006 23:11:58 -0700 (PDT) From: David Miller <davem@...emloft.net> To: dan.j.williams@...el.com Cc: linux-kernel@...r.kernel.org, neilb@...e.de, galak@...nel.crashing.org, christopher.leech@...el.com, alan@...rguk.ukuu.org.uk Subject: Re: [PATCH rev2 1/4] dmaengine: enable mutliple clients and operations Can I ask that the known bugs in the I/O AT DMA code be fixed before we start adding new features to it? Specifically, the lock_cpu_hotplug() call in net_dma_rebalance() is still there and being invoked with a spinlock held. The spinlock is grabbed by the caller, netdev_dma_event() which grabs the net_dma_event_lock spinlock. You cannot invoke lock_cpu_hotplug() while holding a spinlock because lock_cpu_hotplug(), as seen in kernel/cpu.c, takes a semaphore which can sleep. Sleeping while holding a spinlock is not allowed. This is the second time I have tried to make the Intel developers aware of this bug. So please fix this problem. Thanks a lot. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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