[Xen-devel] [PATCH] x86: check if desc->action is NULL when unbinding guest pirq

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

Before igb PF driver is unloaded, dom0 doesn't unload igbvf driver
automatically. When igb drver is unloaded, it invokes the
PHYSDEVOP_manage_pci_remove hypercall to remove the VFs and xen frees the msi
irqs by pci_cleanup_msi() -> ... -> dynamic_irq_cleanup() and sets the
desc->action to NULL.
igbvf driver knows the VF is disappearing via a hook ndo_stop() in dev_close()
and tries to unbind the pirq and xen would crash as the desc->action
is NULL now.
The patch adds the checking for this.

Thanks,
-- Dexuan

Attachment: check_desc_action.patch
Description: check_desc_action.patch

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