From 85631672e6a8032267058b4ccbe53f1924a5d0be Mon Sep 17 00:00:00 2001
From: Michael Reed <mdr@sgi.com>
Date: Wed, 7 Dec 2005 21:46:27 -0600
Subject: [PATCH] [SCSI] fix OOPS due to clearing eh_action prior to aborting
 eh command

The eh_action semaphore in scsi_eh_send_command is cleared after a
command timeout.  The command is subsequently aborted and the abort
will try to call scsi_done() on it.  Unfortunately, the scsi_eh_done()
routine unconditinally completes the semaphore (which is now null).
Fix this race by makiong the scsi_eh_done() routine check that the
semaphore is non null before completing it (mirroring the ordinary
command done/timeout logic).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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