[Xen-devel] [PATCH] Change the pcidevs_lock from rw_lock to spin_lock

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

This patch change the pcidevs_lock to spin_lock.
As pcidevs_lock is changed from protecting only the alldevs_list to more than 
that, it doesn't benifit too much from the rw_lock. Also the previous patch 
18906:2941b1a97c60 is wrong to use read_lock to protect some sensitive data 
(thanks Espen pointed out that).

Also two minor fix in this patch:
a) deassign_device will deadlock when try to get the pcidevs_lock if called by 
pci_release_devices, remove the lock to the caller.
b) The iommu_domain_teardown should not ASSERT for the pcidevs_lock because it 
just update the domain's vt-d mapping.

Signed-off-by: Yunhong Jiang <yunhong.jiang@xxxxxxxxx>

Thanks
Yunhong Jiang

Attachment: pcidevs_lock.patch
Description: pcidevs_lock.patch

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