iscsi-target: Fix reservation conflict -EBUSY response handling bug

This patch addresses a iscsi-target specific bug related to reservation conflict
handling in iscsit_handle_scsi_cmd() that has been causing reservation conflicts
to complete and not fail as expected due to incorrect errno checking.  The problem
occured with the change to return -EBUSY from transport_generic_cmd_sequencer() ->
transport_generic_allocate_tasks() failures, that broke iscsit_handle_scsi_cmd()
checking for -EINVAL in order to invoke a non GOOD status response.

This was manifesting itself as data corruption with legacy SPC-2 reservations,
but also effects iscsi-target LUNs with SPC-3 persistent reservations.

This bug was originally introduced in lio-core commit:

commit 03e98c9eb916f3f0868c1dc344dde2a60287ff72
Author: Nicholas Bellinger <nab@linux-iscsi.org>
Date:   Fri Nov 4 02:36:16 2011 -0700

    target: Address legacy PYX_TRANSPORT_* return code breakage

Reported-by: Martin Svec <martin.svec@zoner.cz>
Cc: Martin Svec <martin.svec@zoner.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 44262908def5..501b27c18145 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1028,7 +1028,7 @@ done:
                 return iscsit_add_reject_from_cmd(
                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
                                 1, 1, buf, cmd);
-        } else if (transport_ret == -EINVAL) {
+        } else if (transport_ret < 0) {
                 /*
                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
                  * in iscsit_execute_cmd() during the CmdSN OOO Execution