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authorRoland Dreier <roland@purestorage.com>2011-11-22 22:51:32 +0100
committerNicholas Bellinger <nab@linux-iscsi.org>2011-12-06 07:00:55 +0100
commit410f670202f0f13cdac8459b9c3effeeead135d1 (patch)
treedfad1b29759c54f4ce5141f6d15b8f3d18d00b6e
parentiscsi-target: Use kmemdup rather than duplicating its implementation (diff)
downloadlinux-410f670202f0f13cdac8459b9c3effeeead135d1.tar.xz
linux-410f670202f0f13cdac8459b9c3effeeead135d1.zip
target: Don't return an error status for 0-length READ and WRITE
IO commands with a TRANSFER LENGTH of 0 are not an error; for example, for READ (10) and WRITE (10), SBC-3 says: A TRANSFER LENGTH field set to zero specifies that no logical blocks shall be read. This condition shall not be considered an error. In case we have nothing to do, just complete the command with good status. Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r--drivers/target/target_core_transport.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 0bdb6badbf99..1b760a0b1109 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3770,8 +3770,15 @@ int transport_generic_new_cmd(struct se_cmd *cmd)
task_cdbs = transport_allocate_control_task(cmd);
}
- if (task_cdbs <= 0)
+ if (task_cdbs < 0)
goto out_fail;
+ else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
+ cmd->t_state = TRANSPORT_COMPLETE;
+ atomic_set(&cmd->t_transport_active, 1);
+ INIT_WORK(&cmd->work, target_complete_ok_work);
+ queue_work(target_completion_wq, &cmd->work);
+ return 0;
+ }
if (set_counts) {
atomic_inc(&cmd->t_fe_count);