From: Christoph Hellwig <hch@infradead.org>
Date: Mon, 17 Oct 2011 17:56:45 +0000 (-0400)
Subject: target: fix list walking in transport_free_dev_tasks
X-Git-Tag: v3.2-rc1~24^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0c2cfe5fe78e682d6235a1d32a363460b1c77528;p=pandora-kernel.git

target: fix list walking in transport_free_dev_tasks

list_for_each_entry_safe only protects against deletions from the list,
but not against any concurrent modifications.  Given that we drop
t_state_lock inside the loop it is not safe in transport_free_dev_tasks.

Instead of use a local dispose_list that we move all tasks that are
to be deleted to.  This is safe because we never do list_emptry checks
on t_list to check if a command is on the list anywhere.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---

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