iommu: Avoid more races around device probe

It turns out there are more subtle races beyond just the main part of
__iommu_probe_device() itself running in parallel - the dev_iommu_free()
on the way out of an unsuccessful probe can still manage to trip up
concurrent accesses to a device's fwspec. Thus, extend the scope of
iommu_probe_device_lock() to also serialise fwspec creation and initial
retrieval.

Reported-by: Zhenhua Huang <[email protected]>
Link: https://lore.kernel.org/linux-iommu/[email protected]/
Fixes: 01657bc14a39 ("iommu: Avoid races around device probe")
Signed-off-by: Robin Murphy <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: André Draszik <[email protected]>
Tested-by: André Draszik <[email protected]>
Link: https://lore.kernel.org/r/16f433658661d7cadfea51e7c65da95826112a2b.1700071477.git.robin.murphy@arm.com
Cc: [email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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