tree f979329a2b5bfb0c92fc83e951d9ac7654c4ba78
parent c83188dcd76b1f0c17c31b4bbd8de57c634b19f8
author Chris Mason <chris.mason@oracle.com> 1271987955 -0400
committer Andy Grover <andy.grover@oracle.com> 1283994748 -0700

rds: rcu-ize rds_ib_get_device()

rds_ib_get_device is called very often as we turn an
ip address into a corresponding device structure.  It currently
take a global spinlock as it walks different lists to find active
devices.

This commit changes the lists over to RCU, which isn't very complex
because they are not updated very often at all.

Signed-off-by: Chris Mason <chris.mason@oracle.com>