netdev - suspend/resume not working in MSIX mode

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Date:	Mon, 14 Jun 2010 18:13:22 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	linux-pci@...r.kernel.org, netdev@...r.kernel.org
Subject: suspend/resume not working in MSIX mode

I'm debugging the bnx2 driver which doesn't work after suspend/resume if
it is running in MSI-X mode.  The problem is that during suspend, the
MSI-X vectors are disabled by the following sequence on x86:

take_cpu_down() -> cpu_disable_common() -> fixup_irqs()

The MSI-X address/data used to disable the vectors are remembered in the
above sequence.  During resume, these address/data are then programmed
back to the device during pci_restore_state(), causing all the vectors
to remain disabled.

Some drivers call free_irq() during suspend and request_irq() during
resume, and that should avoid the problem.  bnx2 and some other drivers
do not do that.  These drivers rely on pci_restore_state() to restore
the MSI-X vectors to the same working state before suspend.

What's the right way to fix this?  Thanks.

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