From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Fri, 30 Jan 2015 01:21:13 +0000 (-0800)
Subject: vhost/scsi: Fix incorrect early vhost_scsi_handle_vq failures
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~13^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=de1419e42088e99f8f839710c42aec759e45de77;p=pandora-kernel.git

vhost/scsi: Fix incorrect early vhost_scsi_handle_vq failures

This patch fixes vhost_scsi_handle_vq() failure cases that result in BUG_ON()
getting triggered when vhost_scsi_free_cmd() is called, and ->tvc_se_cmd has
not been initialized by target_submit_cmd_map_sgls().

It changes tcm_vhost_release_cmd() to use tcm_vhost_cmd->tvc_nexus for obtaining
se_session pointer reference.  Also, avoid calling put_page() on NULL sg->page
entries in vhost_scsi_map_to_sgl() failure path.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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