From: Alex Leung <alex.leung@emulex.com>
Date: Fri, 4 Apr 2014 04:38:19 +0000 (+0000)
Subject: target: Add check to prevent Abort Task from aborting itself
X-Git-Tag: v3.15-rc1~12^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=47b1584c1c95f0bb4d646c47de1c0455bb5cef54;p=pandora-kernel.git

target: Add check to prevent Abort Task from aborting itself

This patch addresses an issue that occurs when an ABTS is received
for an se_cmd that completes just before the sess_cmd_list is searched
in core_tmr_abort_task(). When the sess_cmd_list is searched, since
the ABTS and the FCP_CMND being aborted (that just completed) both
have the same OXID, TFO->get_task_tag(TMR) returns a value that
matches tmr->ref_task_tag (from TFO->get_task_tag(FCP_CMND)), and
the Abort Task tries to abort itself. When this occurs,
transport_wait_for_tasks() hangs forever since the TMR is waiting
for itself to finish.

This patch adds a check to core_tmr_abort_task() to make sure the
TMR does not attempt to abort itself.

Signed-off-by: Alex Leung <alex.leung@emulex.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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