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[Xen-devel] [PATCH] Change the pcidevs_lock from rw_lock to spin_lock
| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] Change the pcidevs_lock from rw_lock to spin_lock |
| From: | "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> |
| Date: | Fri, 19 Dec 2008 17:59:42 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Delivery-date: | Fri, 19 Dec 2008 02:00:48 -0800 |
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| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
| Thread-index: | AclhwIK7p8S6v4ZiS/md75N5kEtIKw== |
| Thread-topic: | [PATCH] Change the pcidevs_lock from rw_lock to spin_lock |
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
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