Merge tag 'v3.18.20' into linux-linaro-lsk-v3.18

Linux 3.18.20

* tag 'v3.18.20': (52 commits)
  Linux 3.18.20
  blk-mq: fix CPU hotplug handling
  SCSI: add 1024 max sectors black list flag
  Fix firmware loader uevent buffer NULL pointer dereference
  arm64: Don't report clear pmds and puds as huge
  9p: don't leave a half-initialized inode sitting around
  9p: forgetting to cancel request on interrupted zero-copy RPC
  NFS: Fix size of NFSACL SETACL operations
  watchdog: omap: assert the counter being stopped before reprogramming
  of: return NUMA_NO_NODE from fallback of_node_to_nid()
  USB: usbfs: allow URBs to be reaped after disconnection
  dell-laptop: Fix allocating & freeing SMI buffer page
  mac80211: prevent possible crypto tx tailroom corruption
  security_syslog() should be called once only
  __bitmap_parselist: fix bug in empty string handling
  mmc: card: Fixup request missing in mmc_blk_issue_rw_rq
  iser-target: Fix possible deadlock in RDMA_CM connection error
  iscsi-target: Convert iscsi_thread_set usage to kthread.h
  ACPICA: Tables: Fix an issue that FACS initialization is performed twice
  Btrfs: fix memory leak in the extent_same ioctl
  ...