From: Hans de Goede <hdegoede@redhat.com>
Date: Sat, 13 Sep 2014 10:26:32 +0000 (+0200)
Subject: uas: Do not use scsi_host_find_tag
X-Git-Tag: fixes-for-v3.18-merge-window~16^2~80
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e61aede477ee108de3f9e57f19cacd8ce3ffe52;p=pandora-kernel.git

uas: Do not use scsi_host_find_tag

Using scsi_host_find_tag with tags returned by the device is unsafe for
multiple reasons:

1) It returns tags->rqs[tag], which may be non NULL even when the cmnd is
   not owned by us
2) It returns tags->rqs[tag], without holding any locks protecting it
3) It returns tags->rqs[tag], without doing any boundary checking

Instead keep our own list which maps tags -> inflight cmnds.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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