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xen/pciback: Document when the 'unbind' and 'bind' functions are called.
And also mention that you cannot do any pci_reset_function, pci_reset_slot, or such calls. This is because they take the same lock as SysFS does - and we would end up with a dead-lock if we call those functions. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
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@ -493,6 +493,8 @@ static int pcistub_seize(struct pci_dev *dev)
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return err;
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}
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/* Called when 'bind'. This means we must _NOT_ call pci_reset_function or
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* other functions that take the sysfs lock. */
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static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
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{
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int err = 0;
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@ -520,6 +522,8 @@ static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
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return err;
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}
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/* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or
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* other functions that take the sysfs lock. */
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static void pcistub_remove(struct pci_dev *dev)
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{
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struct pcistub_device *psdev, *found_psdev = NULL;
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