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authorNicholas Bellinger <nab@linux-iscsi.org>2012-08-16 17:06:41 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2012-08-17 17:24:11 -0700
commit74f4cf290918f05b6489aa732dfb08aa5606b9d6 (patch)
treed41a876e1046dbfbd89ba4a89960d8e52de12887 /drivers/target
parent1d2a2cd95ee0137a2353d1b5635739c281f27cd4 (diff)
target: Fix regression bug with handling of zero-length data CDBs
This patch fixes a regression bug with the handling of zero-length data CDBs within transport_generic_new_cmd() code. The bug was introduced with the following commit as part of the single task conversion work: commit 4101f0a89d4eb13f04cb0344d59a335b862ca5f9 Author: Christoph Hellwig <hch@infradead.org> Date: Tue Apr 24 00:25:03 2012 -0400 target: always allocate a single task where the zero-length check for SCF_SCSI_DATA_SG_IO_CDB was incorrectly changed to SCF_SCSI_CONTROL_SG_IO_CDB because of the seperate comment in transport_generic_new_cmd() wrt to control CDBs zero-length handling introduced in: commit 91ec1d3535b2acf12c599045cc19ad9be3c6a47b Author: Nicholas Bellinger <nab@linux-iscsi.org> Date: Fri Jan 13 12:01:34 2012 -0800 target: Add workaround for zero-length control CDB handling So go ahead and change transport_generic_new_cmd() to handle control+data zero-length CDBs in the same manner for this special case. Tested with iscsi-target + loopback fabric port LUNs on 3.6-rc0 code. This patch will also need to be picked up for 3.5-stable. (hch: Add proper comment in transport_generic_new_cmd) Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Cc: Andy Grover <agrover@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_transport.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index a7589ccdb6f3..ea9a3d2e4f55 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2323,9 +2323,12 @@ int transport_generic_new_cmd(struct se_cmd *cmd)
if (ret < 0)
goto out_fail;
}
-
- /* Workaround for handling zero-length control CDBs */
- if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
+ /*
+ * If this command doesn't have any payload and we don't have to call
+ * into the fabric for data transfers, go ahead and complete it right
+ * away.
+ */
+ if (!cmd->data_length) {
spin_lock_irq(&cmd->t_state_lock);
cmd->t_state = TRANSPORT_COMPLETE;
cmd->transport_state |= CMD_T_ACTIVE;