From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 9 Mar 2012 19:00:06 +0000 (-0800)
Subject: [SCSI] libsas: introduce sas_work to fix sas_drain_work vs sas_queue_work
X-Git-Tag: v3.4-rc6~31^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=22b9153faa2263aa89625de25e71c7d44c8dbd16;p=pandora-kernel.git

[SCSI] libsas: introduce sas_work to fix sas_drain_work vs sas_queue_work

When requeuing work to a draining workqueue the last work instance may
not be idle, so sas_queue_work() must not touch work->entry.  Introduce
sas_work with a drain_node list_head to have a private list for
collecting work deferred due to drain collision.

Fixes reports like:
  BUG: unable to handle kernel NULL pointer dereference at           (null)
  IP: [<ffffffff810410d4>] process_one_work+0x2e/0x338

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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