From: Michael Reed <mdr@sgi.com>
Date: Thu, 8 Dec 2005 03:46:27 +0000 (-0600)
Subject: [SCSI] fix OOPS due to clearing eh_action prior to aborting eh command
X-Git-Tag: v2.6.15-rc6~62^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85631672e6a8032267058b4ccbe53f1924a5d0be;p=pandora-kernel.git

[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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